0000911177-26-000021 | 10-Q | XBRL Viewer | Casella Waste Systems INC

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DEBT - Schedule of Variable Rate Margins (Details) - Credit Facility	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2024
Debt Instrument [Line Items]
Variable rate adjustment		0.04%
Minimum \| Line of Credit \| SOFR
Debt Instrument [Line Items]
Variable rate margin	1.30%
Minimum \| Line of Credit \| Base Rate
Debt Instrument [Line Items]
Variable rate margin	0.30%
Maximum \| Line of Credit \| SOFR
Debt Instrument [Line Items]
Variable rate margin	2.175%
Maximum \| Line of Credit \| Base Rate
Debt Instrument [Line Items]
Variable rate margin	1.175%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

ACCOUNTING CHANGES

3 Months Ended

Mar. 31, 2026

Accounting Changes and Error Corrections [Abstract]

ACCOUNTING CHANGES

The following table provides a brief description of recent Accounting Standards Update’s (“ASU”) to the Accounting Standards Codification (“ASC”) issued by the Financial Accounting Standards Board (“FASB”) that are pending adoption as of March 31, 2026 and deemed to have a possible material impact on our consolidated financial statements based on current account balances and activity:

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

ASU No. 2024-03: Improvements to Income Statement - Expense Disaggregation Disclosures (Subtopic 220-40)

Requires entities to provide additional disclosure related to more detailed information about specific types of expenses contained in commonly presented expense captions on the statements of operations.

This guidance is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. This guidance will be applied on a prospective basis with the option to apply the standard retrospectively. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

ASU No. 2025-06: Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40)

Removes all references to prescriptive and sequential software development stages (referred to as “project stages”) and requires entities to start capitalizing software costs when management has authorized and committed to funding the software project, it is probable that the project will be completed and that the software will be used to perform the function intended.

This guidance is effective for fiscal years beginning after December 15, 2027 and interim periods within those annual reporting periods, with early adoption permitted as of the beginning of an annual reporting period. This guidance will be applied on either a prospective, retrospective or modified transition basis. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

ASU No. 2025-09: Derivatives and Hedging (Topic 815)

Clarifies certain aspects of the guidance on hedge accounting to more closely align hedge accounting with the economics of an entity’s risk management activities by enabling entities to achieve and maintain hedge accounting for highly effective economic hedges of forecasted transactions. Upon adoption of this guidance, entities are permitted to modify certain critical terms of certain existing hedging relationships without dedesignating the hedge.

This guidance is effective for fiscal years beginning after December 15, 2026, and interim periods within those annual reporting periods, with early adoption permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

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+ Details

BASIS OF PRESENTATION	3 Months Ended
BASIS OF PRESENTATION	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Casella Waste Systems, Inc. (“Parent”) and its subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company. We provide resource management expertise and services to residential, commercial, municipal, institutional and industrial customers, primarily in the areas of solid waste collection and disposal, transfer, recycling and organics services. We provide integrated solid waste services with operating locations in eleven states: Vermont, New Hampshire, New York, Massachusetts, Connecticut, Maine, Pennsylvania, New Jersey, Delaware, Maryland and West Virginia, with our headquarters located in Rutland, Vermont. We manage our solid waste operations on a geographic basis through three regional operating segments, the Eastern, Western and Mid-Atlantic regions, each of which provides a comprehensive range of non-hazardous solid waste services. We manage our resource renewal operations through the Resource Solutions operating segment, which leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment. The accompanying unaudited consolidated financial statements, which include the accounts of the Parent and our wholly-owned subsidiaries, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). All significant intercompany accounts and transactions are eliminated in consolidation. Investments in entities in which we do not have a controlling financial interest are accounted for under either the equity method or the cost method of accounting, as appropriate. Our significant accounting policies are more fully discussed in Item 8. “Financial Statements and Supplementary Data” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, which was filed with the SEC on February 20, 2026 (“2025 Form 10-K”). Preparation of our consolidated financial statements in accordance with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the accounting for and recognition and disclosure of assets, liabilities, equity, revenues and expenses. We must make these estimates and assumptions because certain information that we use is dependent on future events, cannot be calculated with a high degree of precision given the available data, or simply cannot be readily calculated. In the opinion of management, these consolidated financial statements include all adjustments, including normal recurring and nonrecurring adjustments, as applicable, necessary for a fair statement of the financial position, results of operations and cash flows for the periods presented. The results for the three months ended March 31, 2026 may not be indicative of the results for any other interim period or the entire fiscal year. The consolidated financial statements presented herein should be read in conjunction with our audited consolidated financial statements included in our 2025 Form 10-K. Subsequent Events We have evaluated subsequent events or transactions that have occurred after the consolidated balance sheet date of March 31, 2026 through the date of filing of the consolidated financial statements with the SEC on this Quarterly Report on Form 10-Q. Except as disclosed, no material subsequent events have occurred since March 31, 2026 through the date of this filing that would require recognition or adjustments to our disclosures in our consolidated financial statements.

SEGMENT REPORTING - Schedule of Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Segment Reporting Information [Line Items]
Gross revenues	$ 457,328	$ 417,101
Cost of operations	308,927	280,452
General and administration	58,128	56,486
Depreciation and amortization	77,982	71,491
Expense from acquisition activities	6,509	5,529
Organics facility closure charge	927	0
Operating income	4,855	3,143
Interest expense, net	13,993	11,598
Other income	(314)	(320)
Loss before income taxes	(8,824)	(8,135)
Capital expenditures	49,979	55,475
Total assets	3,270,449	3,205,870	$ 3,303,326
Solid waste
Segment Reporting Information [Line Items]
Gross revenues	368,529	334,904
Solid waste \| Eastern
Segment Reporting Information [Line Items]
Gross revenues	111,287	104,740
Solid waste \| Western
Segment Reporting Information [Line Items]
Gross revenues	162,448	152,316
Solid waste \| Mid-Atlantic
Segment Reporting Information [Line Items]
Gross revenues	94,794	77,848
Resource Solutions
Segment Reporting Information [Line Items]
Gross revenues	88,799	82,197
Inter-company revenue
Segment Reporting Information [Line Items]
Gross revenues	(99,842)	(85,304)
Cost of operations	(99,842)	(85,304)
Inter-company revenue \| Solid waste
Segment Reporting Information [Line Items]
Gross revenues	94,044	81,828
Inter-company revenue \| Solid waste \| Eastern
Segment Reporting Information [Line Items]
Gross revenues	27,510	26,289
Inter-company revenue \| Solid waste \| Western
Segment Reporting Information [Line Items]
Gross revenues	59,992	53,726
Inter-company revenue \| Solid waste \| Mid-Atlantic
Segment Reporting Information [Line Items]
Gross revenues	6,542	1,813
Inter-company revenue \| Resource Solutions
Segment Reporting Information [Line Items]
Gross revenues	5,798	3,476
Operating Segments \| Solid waste
Segment Reporting Information [Line Items]
Gross revenues	462,573	416,732
Cost of operations	328,998	295,237
General and administration	20,947	19,222
Depreciation and amortization	70,764	64,730
Expense from acquisition activities	1,902	3,654
Organics facility closure charge	0
Operating income	39,962	33,889
Interest expense, net	1,007	502
Capital expenditures	44,656	48,936
Total assets	2,801,489	2,591,161
Operating Segments \| Solid waste \| Eastern
Segment Reporting Information [Line Items]
Gross revenues	138,797	131,029
Cost of operations	100,901	95,653
General and administration	6,591	6,053
Depreciation and amortization	17,156	16,109
Expense from acquisition activities	64	396
Organics facility closure charge	0
Operating income	14,085	12,818
Interest expense, net	384	226
Capital expenditures	7,675	8,103
Total assets	549,868	538,730
Operating Segments \| Solid waste \| Western
Segment Reporting Information [Line Items]
Gross revenues	222,440	206,042
Cost of operations	151,775	140,412
General and administration	8,397	9,169
Depreciation and amortization	32,457	30,360
Expense from acquisition activities	122	844
Organics facility closure charge	0
Operating income	29,689	25,257
Interest expense, net	238	221
Capital expenditures	16,078	15,200
Total assets	1,117,182	1,131,276
Operating Segments \| Solid waste \| Mid-Atlantic
Segment Reporting Information [Line Items]
Gross revenues	101,336	79,661
Cost of operations	76,322	59,172
General and administration	5,959	4,000
Depreciation and amortization	21,151	18,261
Expense from acquisition activities	1,716	2,414
Organics facility closure charge	0
Operating income	(3,812)	(4,186)
Interest expense, net	385	55
Capital expenditures	20,903	25,633
Total assets	1,134,439	921,155
Operating Segments \| Resource Solutions
Segment Reporting Information [Line Items]
Gross revenues	94,597	85,673
Cost of operations	78,859	70,032
General and administration	5,451	4,541
Depreciation and amortization	5,196	5,134
Expense from acquisition activities	17	992
Organics facility closure charge	927
Operating income	4,147	4,974
Interest expense, net	22	26
Capital expenditures	1,716	4,070
Total assets	277,422	276,983
Corporate Entities
Segment Reporting Information [Line Items]
Cost of operations	912	487
General and administration	31,730	32,723
Depreciation and amortization	2,022	1,627
Expense from acquisition activities	4,590	883
Organics facility closure charge	0
Operating income	(39,254)	(35,720)
Interest expense, net	12,964	11,070
Capital expenditures	3,607	2,469
Total assets	$ 191,538	$ 337,726

DEBT - Narrative - Tax-Exempt Financings (Details) - Unsecured Debt - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Debt Instrument [Line Items]
Principal amount of debt	$ 273,500
Vermont Bonds 2022A-1
Debt Instrument [Line Items]
Principal amount of debt	$ 25,000	$ 25,000
Aggregate principal amount issued			$ 25,000
Stated interest rate	4.375%		4.375%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

DEBT

3 Months Ended

Mar. 31, 2026

Debt And Derivatives Disclosure [Abstract]

DEBT

A summary of debt is as follows:


	March 31, 2026		December 31, 2025
Senior Secured Credit Facility:
Term loan A facility (“Term Loan Facility”) payable quarterly beginning in the fiscal year ended December 31, 2027 with balance due September 2029; bearing interest at 5.218% as of March 31, 2026	$	800,000	$	800,000


Revolving Credit Facility due September 2029; bearing interest at term secured overnight financing rate (“Term SOFR”) plus 1.550%	—		—

Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 (“New York Bonds 2014R-1”) due December 2044 - fixed rate interest period bearing interest at 2.875% through December 2029	25,000		25,000
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 (“New York Bonds 2014R-2”) due December 2044 - fixed rate interest period bearing interest at 3.125% through May 2026	15,000		15,000
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 (“New York Bonds 2020”) due September 2050 - fixed rate interest period bearing interest at 4.250% through September 2030	37,500		37,500
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020R-2 (“New York Bonds 2020R-2”) due September 2050 - fixed rate interest period bearing interest at 5.125% through September 2030	35,000		35,000



Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-3 (“FAME Bonds 2015R-3”) due August 2035 - fixed rate interest period bearing interest at 5.000% through August 2035	29,000		29,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2024 (“FAME Bonds 2024”) due December 2047 - fixed rate interest period bearing interest at 4.625% through May 2035	45,000		45,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 (“Vermont Bonds 2013”) due April 2036 - fixed rate interest period bearing interest at 4.625% through April 2028	16,000		16,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 (“Vermont Bonds 2022A-1”) due June 2052 - fixed rate interest period bearing interest at 5.000% through May 2027	35,000		35,000
Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds Series 2022A-2 (“Vermont Bonds 2022A-2”) due June 2052 - fixed rate interest period bearing interest at 4.375% through May 2032	25,000		25,000
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 (“New Hampshire Bonds”) due April 2029 - fixed rate interest period bearing interest at 2.950% through April 2029	11,000		11,000
Other:
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.708% as of March 31, 2026	89,969		94,035
Notes payable with no stated interest rate maturing through September 2028	1,097		1,097
Principal amount of debt	1,164,566		1,168,632
Less—unamortized debt issuance costs	13,223		13,970
Debt less unamortized debt issuance costs	1,151,343		1,154,662
Less—current maturities of debt	24,588		25,735
	$	1,126,755	$	1,128,927

Credit Facility

In the fiscal year ended December 31, 2024 (”fiscal year 2024”), we entered into a second amended and restated credit agreement (“Credit Agreement”), which amended and restated in its entirety our amended and restated credit agreement (“Prior Credit Agreement”). The Credit Agreement provides for a $800,000 aggregate principal amount Term Loan Facility and a $700,000 Revolving Credit Facility, with a $155,000 sublimit for letters of credit (collectively, "Credit Facility"). A portion of the proceeds of the Credit Facility refinanced in full our term loans under the Prior Credit Agreement.

We have the right to request, at our discretion, an increase in the amount of loans under the Credit Facility by an aggregate amount of $200,000, subject to further increase based on the terms and conditions set forth in the Credit Agreement. The Credit Facility has a 5-year term that matures in September 2029. The Credit Facility shall bear interest, at our election, at Term SOFR or at a base rate, in each case plus or minus any sustainable rate adjustment of up to positive or negative 4.0 basis points per annum, plus an applicable interest rate margin based upon our consolidated net leverage ratio as follows:

Term SOFR Loans

Base Rate Loans

Credit Facility

1.300% to 2.175%

0.300% to 1.175%

A commitment fee will be charged on undrawn amounts of our Revolving Credit Facility based upon our consolidated net leverage ratio in the range of 0.200% to 0.400% per annum, plus a sustainability adjustment of up to positive or negative 1.0 basis point per annum. The Credit Agreement provides that Term SOFR is subject to a zero percent floor. We are also required to pay a fronting fee for each letter of credit of 0.250% per annum. Interest under the Credit Agreement is subject to increase by 2.000% per annum during the continuance of a payment default and may be subject to increase by 2.000% per annum during the continuance of any other event of default. The Credit Facility is guaranteed jointly and severally, fully and unconditionally by all of our significant wholly-owned subsidiaries and secured by substantially all of our assets. As of March 31, 2026, further advances were available under the Revolving Credit Facility in the amount of $673,418. The available amount is net of outstanding irrevocable letters of credit totaling $26,582, and as of March 31, 2026 no amount had been drawn.

The Credit Agreement requires us to maintain a minimum interest coverage ratio and a maximum consolidated net leverage ratio, to be measured at the end of each fiscal quarter. In addition to these financial covenants, the Credit Agreement contains a number of important customary affirmative and negative covenants which restrict, among other things, our ability to sell assets, incur additional debt, create liens, make investments, and pay dividends. As of March 31, 2026, we were in compliance with the covenants contained in the Credit Agreement. An event of default under any of our debt agreements could permit some of our lenders, including the lenders under the Credit Facility, to declare all amounts borrowed from them to be immediately due and payable, together with accrued and unpaid interest, or, in the case of the Credit Facility, terminate the commitment to make further credit extensions thereunder, which could, in turn, trigger cross-defaults under other debt obligations. If we were unable to repay debt to our lenders or were otherwise in default under any provision governing our outstanding debt obligations, our secured lenders could proceed against us and against the collateral securing that debt.

Tax-Exempt Financings

Industrial revenue bonds are tax-exempt municipal debt securities issued by a government agency on our behalf and sold only to qualified institutional buyers. As of March 31, 2026, we had outstanding $273,500 aggregate principal amount of tax-exempt bonds issued by the states of New York, Vermont, Maine and New Hampshire (collectively, the “Industrial Revenue Bonds”), which are unsecured and guaranteed jointly and severally, fully and unconditionally by all of our significant wholly-owned subsidiaries, and require interest payments semi-annually. The Industrial Revenue Bonds have fixed rate interest periods. At the end of each respective fixed rate interest period, the corresponding tax-exempt bond may be converted to a variable rate interest period or remarketed over a new fixed rate interest period. We borrowed the proceeds of the Industrial Revenue Bonds to finance or reimburse certain qualified capital projects and other costs in each respective state of issuance as defined in the related offering memorandum and indenture.

In the three months ended March 31, 2025, we completed the drawdown of $25,000 aggregate principal amount of Vermont Bonds 2022A-2, which bears a fixed interest rate of 4.375% through May 2032 and repaid in full Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3, which matured in January 2025.

Cash, Cash Equivalents and Restricted Cash - Non-Current

Restricted cash is included with restricted assets in our consolidated balance sheets based on the nature of the underlying restriction. Our restricted cash included with restricted assets, classified as non-current assets as of December 31, 2025, was associated with legally restricted cash held in an escrow account due to the timing of the close of an acquisition.

Beginning of period and end of period cash, cash equivalents and restricted cash - non-current presented in the consolidated statements of cash flows is reconciled as follows:


	March 31, 2026		December 31, 2025
Cash and cash equivalents	$	126,903	$	123,773
Restricted cash - non-current	—		93,086

Cash, cash equivalents and restricted cash - non-current	$	126,903	$	216,859

Cash Flow Hedges

Our strategy to reduce exposure to interest rate risk involves entering into interest rate derivative agreements to hedge against adverse movements in interest rates related to the variable rate portion of our long-term debt. We have designated these derivative instruments as highly effective cash flow hedges, and therefore the change in their fair value is recorded in stockholders’ equity as a component of accumulated other comprehensive loss, net of tax and included in interest expense at the same time as interest expense is affected by the hedged transactions. Differences paid or received over the life of the agreements are recorded as additions to or reductions of interest expense on the underlying debt and included in cash flows from operating activities.

As of both March 31, 2026 and December 31, 2025, we had $515,000 notional amount of active interest rate derivative agreements outstanding. Interest rate derivative agreements outstanding as of March 31, 2026, mature between December 2026 and February 2030 and provide that we receive interest based on Term SOFR, restricted by a 0.0% floor, and pay interest at a weighted average rate of approximately 3.626%.

A summary of the effect of cash flow hedges related to derivative instruments on the consolidated balance sheets follows:


		Fair Value
	Balance Sheet Location	March 31, 2026		December 31, 2025
Interest rate swaps	Other current assets	$	2,133	$	2,081
Interest rate swaps	Other non-current assets	931		835
		$	3,064	$	2,916

Interest rate swaps	Other accrued liabilities	$	2,228	$	3,073
Interest rate swaps	Other long-term liabilities	3,114		5,348
		$	5,342	$	8,421

Interest rate swaps	Accumulated other comprehensive loss, net of tax	$	(2,278)	$	(5,505)
Interest rate swaps - tax effect	Accumulated other comprehensive loss, net of tax	582		1,550
		$	(1,696)	$	(3,955)

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

BUSINESS COMBINATIONS (Tables)

3 Months Ended

Mar. 31, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Schedule of Purchase Price Paid for Acquisitions

A summary of the purchase price and the purchase price allocation for acquisitions follows:


	Three Months Ended March 31,
	2026		2025
Purchase Price:
Cash used in acquisitions, net of cash acquired of $— and $—, respectively	$	93,058	$	103,498


Settlements due from sellers	(302)		—


	$	92,756	$	103,498
Allocated as follows:
Current assets (1)	$	3,069	$	5,727




Property and equipment:
Land	1,389		3,160

Buildings and improvements	4,909		4,260
Machinery, equipment and other	12,373		17,895
Operating lease right-of-use assets	—		8,829
Intangible assets:
Trade names	—		304
Covenants not-to-compete	—		1,779
Customer relationships	—		23,447


Current liabilities	(2,455)		(374)






Operating lease liabilities, less current portion	—		(8,352)

Fair value of assets acquired and liabilities assumed	19,285		56,675

Excess purchase price allocated to goodwill	$	73,471	$	46,823

(1)Includes contract receivables as of the date of the acquisitions in the three months ended March 31, 2026 and 2025, of $3,033 and $5,270, respectively. Substantially all of the contractual amounts are expected to be collected.

Schedule of Unaudited Pro forma Combined Information

Unaudited pro forma combined information that shows our operational results prepared as though each acquisition completed since the beginning of the prior fiscal year had occurred as of January 1, 2025 is as follows:


	Three Months Ended March 31,
		2026		2025
Revenues		$	457,328	$	444,449
Operating income		$	4,855	$	4,008
Net loss		$	(5,539)	$	(4,496)

Basic and diluted loss per share attributable to common stockholders:



Weighted average common shares outstanding		63,544		63,387
Basic and diluted loss per common share		$	(0.09)	$	(0.07)

- Definition

Tabular disclosure of business combination. Includes, but is not limited to, recognized asset and liability.

+ References + Details

STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of Stock Option Activity

A summary of stock option activity follows:


	Stock Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2025	101	$	80.85
Granted	—	$	—
Exercised	—	$	—
Forfeited	—	$	—
Outstanding, March 31, 2026	101	$	80.85	6.5	$	89
Exercisable, March 31, 2026	60	$	80.25	6.4	$	89

Schedule of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity

A summary of restricted stock award, restricted stock unit and performance stock unit activity follows:


	Restricted Stock Awards, Restricted Stock Units, and Performance Stock Units (1)	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2025	207	$	104.73
Granted	135	$	95.17
Class A Common Stock Vested	(41)	$	92.49
Forfeited	(8)	$	110.63
Outstanding, March 31, 2026	293	$	101.90	2.2	$	23,241
Unvested, March 31, 2026	530	$	103.90	2.1	$	42,020

(1)Performance stock unit grants, including market-based performance stock units, are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 237 shares of Class A common stock currently included in unvested.

Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive (Loss) Income, Net of Tax

A summary of the changes in the balances of each component of accumulated other comprehensive loss, net of tax follows:



	Interest Rate Swaps
Balance, December 31, 2025	$	(3,955)

Other comprehensive income before reclassifications	3,429
Interest rate swap amounts reclassified into interest expense	(201)
Income tax provision related to items of other comprehensive loss	(969)
Other comprehensive income, net of tax	2,259
Balance, March 31, 2026	$	(1,696)

Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss, Net of Tax

A summary of reclassifications out of accumulated other comprehensive (loss) income, net of tax into earnings follows:


	Three Months Ended March 31,
	2026		2025
Accumulated Other Comprehensive (Loss) Income, Net of Tax	Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income, Net of Tax				Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	(201)	$	(1,011)		Interest expense
	201		1,011			Loss before income taxes
	59		297			Benefit for income taxes
	$	142	$	714		Net loss

GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Amortization Expense Estimated (Details) $ in Thousands	Mar. 31, 2026 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
For the remainder of the fiscal year ending December 31, 2026	$ 51,545
Fiscal year ending December 31, 2027	61,057
Fiscal year ending December 31, 2028	51,960
Fiscal year ending December 31, 2029	40,158
Fiscal year ending December 31, 2030	28,528
Thereafter	$ 39,231

REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total revenues	$ 457,328	$ 417,101
Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	9,550	12,521
Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	447,778	404,580
Collection
Disaggregation of Revenue [Line Items]
Total revenues	309,652	276,461
Landfill
Disaggregation of Revenue [Line Items]
Total revenues	21,478	20,917
Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	28,033	27,568
Transportation
Disaggregation of Revenue [Line Items]
Total revenues	4,647	5,214
Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	2,935	2,765
Processing
Disaggregation of Revenue [Line Items]
Total revenues	45,099	46,495
National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	45,484	37,681
Eastern
Disaggregation of Revenue [Line Items]
Total revenues	111,287	104,740
Eastern \| Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	196	96
Eastern \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	111,091	104,644
Eastern \| Collection
Disaggregation of Revenue [Line Items]
Total revenues	87,556	81,062
Eastern \| Landfill
Disaggregation of Revenue [Line Items]
Total revenues	6,545	6,796
Eastern \| Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	13,663	13,680
Eastern \| Transportation
Disaggregation of Revenue [Line Items]
Total revenues	1,419	1,348
Eastern \| Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	663	252
Eastern \| Processing
Disaggregation of Revenue [Line Items]
Total revenues	1,441	1,602
Eastern \| National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Western
Disaggregation of Revenue [Line Items]
Total revenues	162,448	152,316
Western \| Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	243	704
Western \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	162,205	151,612
Western \| Collection
Disaggregation of Revenue [Line Items]
Total revenues	129,086	118,605
Western \| Landfill
Disaggregation of Revenue [Line Items]
Total revenues	14,084	13,434
Western \| Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	13,435	13,521
Western \| Transportation
Disaggregation of Revenue [Line Items]
Total revenues	3,228	3,866
Western \| Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	2,272	2,513
Western \| Processing
Disaggregation of Revenue [Line Items]
Total revenues	343	377
Western \| National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic
Disaggregation of Revenue [Line Items]
Total revenues	94,794	77,848
Mid-Atlantic \| Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	94,794	77,848
Mid-Atlantic \| Collection
Disaggregation of Revenue [Line Items]
Total revenues	93,010	76,794
Mid-Atlantic \| Landfill
Disaggregation of Revenue [Line Items]
Total revenues	849	687
Mid-Atlantic \| Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	935	367
Mid-Atlantic \| Transportation
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic \| Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic \| Processing
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic \| National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions
Disaggregation of Revenue [Line Items]
Total revenues	88,799	82,197
Resource Solutions \| Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	9,111	11,721
Resource Solutions \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	79,688	70,476
Resource Solutions \| Collection
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions \| Landfill
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions \| Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions \| Transportation
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions \| Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions \| Processing
Disaggregation of Revenue [Line Items]
Total revenues	43,315	44,516
Resource Solutions \| National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	$ 45,484	$ 37,681

GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,120,056
Acquisitions	73,471
Business Combination Adjustments	573
Goodwill, ending balance	1,194,100
Eastern
Goodwill [Roll Forward]
Goodwill, beginning balance	110,533
Acquisitions	0
Business Combination Adjustments	0
Goodwill, ending balance	110,533
Western
Goodwill [Roll Forward]
Goodwill, beginning balance	371,035
Acquisitions	0
Business Combination Adjustments	573
Goodwill, ending balance	371,608
Mid-Atlantic
Goodwill [Roll Forward]
Goodwill, beginning balance	584,136
Acquisitions	73,471
Business Combination Adjustments	0
Goodwill, ending balance	657,607
Resource Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	54,352
Acquisitions	0
Business Combination Adjustments	0
Goodwill, ending balance	$ 54,352

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

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+ Details

BUSINESS COMBINATIONS - Narrative (Details) - business	1 Months Ended	3 Months Ended
BUSINESS COMBINATIONS - Narrative (Details) - business	Apr. 30, 2026	Mar. 31, 2025	Mar. 31, 2026
Business Combination [Line Items]
Number of businesses acquired		3
Subsequent Event
Business Combination [Line Items]
Number of businesses acquired	3
Minimum
Business Combination [Line Items]
Useful life of finite lived intangible assets			2 years
Maximum
Business Combination [Line Items]
Useful life of finite lived intangible assets			10 years
Mid-Atlantic
Business Combination [Line Items]
Number of businesses acquired		2

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended
REVENUE RECOGNITION - Narrative (Details) - USD ($)	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Disaggregation of Revenue [Line Items]
Rebates	$ (457,328,000)	$ (417,101,000)
Revenue recognized for performance obligation satisfied in previous period	0	0
Gross receivables from contracts	179,359,000		$ 181,616,000
Contract liabilities	45,706,000		$ 45,153,000
Rebate for Recycled or Returned Organic Materials
Disaggregation of Revenue [Line Items]
Rebates	$ 8,451,000	$ 8,940,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

REVENUE RECOGNITION

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

Revenues associated with our solid waste operations are derived mainly from solid waste (i) collection and (ii) disposal services, which include landfill and transfer station services, as well as (iii) transportation, (iv) landfill gas-to-energy and (v) processing services. Revenues associated with our resource renewal operations are derived from processing services and our National Accounts business.

The following tables set forth revenues disaggregated by service line and timing of revenue recognition by reportable operating segment for each of the three months ended March 31, 2026 and 2025:

Three Months Ended March 31, 2026


	Eastern		Western		Mid-Atlantic		Resource Solutions		Total Revenues
Collection	$	87,556	$	129,086	$	93,010	$	—	$	309,652
Landfill	6,545		14,084		849		—		21,478
Transfer station	13,663		13,435		935		—		28,033
Transportation	1,419		3,228		—		—		4,647
Landfill gas-to-energy	663		2,272		—		—		2,935
Processing	1,441		343		—		43,315		45,099
National Accounts	—		—		—		45,484		45,484
Total revenues	$	111,287	$	162,448	$	94,794	$	88,799	$	457,328

Transferred at a point-in-time	$	196	$	243	$	—	$	9,111	$	9,550
Transferred over time	111,091		162,205		94,794		79,688		447,778
Total revenues	$	111,287	$	162,448	$	94,794	$	88,799	$	457,328

Three Months Ended March 31, 2025


	Eastern		Western		Mid-Atlantic		Resource Solutions (1)		Total Revenues
Collection	$	81,062	$	118,605	$	76,794	$	—	$	276,461
Landfill	6,796		13,434		687		—		20,917
Transfer station	13,680		13,521		367		—		27,568
Transportation	1,348		3,866		—		—		5,214
Landfill gas-to-energy	252		2,513		—		—		2,765
Processing	1,602		377		—		44,516		46,495
National Accounts	—		—		—		37,681		37,681
Total revenues	$	104,740	$	152,316	$	77,848	$	82,197	$	417,101

Transferred at a point-in-time	$	96	$	704	$	—	$	11,721	$	12,521
Transferred over time	104,644		151,612		77,848		70,476		404,580
Total revenues	$	104,740	$	152,316	$	77,848	$	82,197	$	417,101

(1)Prior period amounts have been moved within Resource Solutions between the National Accounts and processing service lines to conform to the current period presentation reflecting the realignment of a business unit related to organic materials brokerage operations. See Note 13, Segment Reporting for further disclosure over our reportable operating segments.

Payments to customers that are not in exchange for a distinct good or service are recorded as a reduction of revenues. Rebates to certain customers associated with payments for recycled or organic materials that are received and subsequently processed and sold to other third-parties amounted to $8,451 and $8,940 in the three months ended March 31, 2026 and March 31, 2025, respectively. Rebates are generally recorded as a reduction of revenues upon the sale of such materials, or upon receipt of the recycled materials at our facilities. We did not record revenues in the three months ended March 31, 2026 or March 31, 2025 from performance obligations satisfied in previous periods.

Contract receivables, which are included in accounts receivable, net in our consolidated balance sheets, are recorded when billed or when related revenue is earned, if earlier, and represent claims against third-parties that will be settled in cash. Accounts receivable, net includes receivables from contracts of $179,359 and $181,616 as of March 31, 2026 and December 31, 2025, respectively. Certain customers are billed in advance and, accordingly, recognition of the related revenues for which payment has been received is deferred as a contract liability until the services are provided and control transferred to the customer. We recognized contract liabilities of $45,706 and $45,153 as of March 31, 2026 and December 31, 2025, respectively. Due to the short term nature of advanced billings, substantially all of the deferred revenue recognized as a contract liability as of December 31, 2025 and December 31, 2024 was recognized as revenue during the three months ended March 31, 2026 and March 31, 2025, respectively, when the services were performed.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

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+ Details

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value

Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis follow:


	Fair Value Measurement at March 31, 2026 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted investment securities - landfill closure	$	2,951	$	—	$	—
Interest rate swaps	—		3,064		—

	$	2,951	$	3,064	$	—

Liabilities:

Interest rate swaps	$	—	$	5,342	$	—


	Fair Value Measurement at December 31, 2025 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:


Restricted investment securities - landfill closure	$	3,179	$	—	$	—
Interest rate swaps	—		2,916		—
	$	3,179	$	2,916	$	—
Liabilities:

Interest rate swaps	$	—	$	8,421	$	—

GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets by Type (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 528,826	$ 528,826
Less accumulated amortization	(256,347)	(237,971)
Intangible assets, net	272,479	290,855
Covenants Not-to-Compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	74,892	74,892
Less accumulated amortization	(45,210)	(43,041)
Intangible assets, net	29,682	31,851
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets	427,625	427,625
Less accumulated amortization	(191,816)	(176,824)
Intangible assets, net	235,809	250,801
Trade Names
Finite-Lived Intangible Assets [Line Items]
Intangible assets	26,309	26,309
Less accumulated amortization	(19,321)	(18,106)
Intangible assets, net	$ 6,988	$ 8,203

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

DEBT - Narrative - Credit Facility (Details) - USD ($)	3 Months Ended	12 Months Ended
DEBT - Narrative - Credit Facility (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2024
Line of Credit \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit drawn	$ 0
Credit Facility
Line of Credit Facility [Line Items]
Additional revolver capacity		$ 200,000,000
Facility term		5 years
Commitment fee percentage, adjustment	0.01%
Floor interest rate	0.00%
Interest rate, annual increase upon payment default	2.00%
Interest rate, annual increase upon other event of default	2.00%
Credit Facility \| Minimum
Line of Credit Facility [Line Items]
Commitment fee percentage	0.20%
Credit Facility \| Maximum
Line of Credit Facility [Line Items]
Commitment fee percentage	0.40%
Credit Facility \| Secured Debt
Line of Credit Facility [Line Items]
Aggregate principal amount issued		$ 800,000,000
Credit Facility \| Line of Credit \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		700,000,000
Letters of credit sublimit		$ 155,000,000
Remaining capacity	$ 673,418,000
Credit Facility \| Line of Credit \| Letter of Credit
Line of Credit Facility [Line Items]
Fronting fee	0.25%
Letters of credit outstanding	$ 26,582,000

COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

Schedule of Environmental Liability

A summary of the changes to the aggregate environmental remediation liabilities for the three months ended March 31, 2026 and 2025 follows:


	Three Months Ended March 31,
	2026		2025
Beginning balance	$	4,988	$	5,532
Accretion expense	22		23


Obligations settled (1)	(69)		(12)
Ending balance	4,941		5,543
Less: current portion	1,239		1,585
Long-term portion	$	3,702	$	3,958

(1)May include amounts that are being processed through accounts payable as a part of our disbursement cycle.

SEGMENT REPORTING - Narrative (Details) - Solid waste	3 Months Ended
SEGMENT REPORTING - Narrative (Details) - Solid waste	Mar. 31, 2026 segment
Segment Reporting Information [Line Items]
Number of operating segments	3
Number of reportable segments	3

REVENUE RECOGNITION (Tables)

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following tables set forth revenues disaggregated by service line and timing of revenue recognition by reportable operating segment for each of the three months ended March 31, 2026 and 2025:

Three Months Ended March 31, 2026


	Eastern		Western		Mid-Atlantic		Resource Solutions		Total Revenues
Collection	$	87,556	$	129,086	$	93,010	$	—	$	309,652
Landfill	6,545		14,084		849		—		21,478
Transfer station	13,663		13,435		935		—		28,033
Transportation	1,419		3,228		—		—		4,647
Landfill gas-to-energy	663		2,272		—		—		2,935
Processing	1,441		343		—		43,315		45,099
National Accounts	—		—		—		45,484		45,484
Total revenues	$	111,287	$	162,448	$	94,794	$	88,799	$	457,328

Transferred at a point-in-time	$	196	$	243	$	—	$	9,111	$	9,550
Transferred over time	111,091		162,205		94,794		79,688		447,778
Total revenues	$	111,287	$	162,448	$	94,794	$	88,799	$	457,328

Three Months Ended March 31, 2025


	Eastern		Western		Mid-Atlantic		Resource Solutions (1)		Total Revenues
Collection	$	81,062	$	118,605	$	76,794	$	—	$	276,461
Landfill	6,796		13,434		687		—		20,917
Transfer station	13,680		13,521		367		—		27,568
Transportation	1,348		3,866		—		—		5,214
Landfill gas-to-energy	252		2,513		—		—		2,765
Processing	1,602		377		—		44,516		46,495
National Accounts	—		—		—		37,681		37,681
Total revenues	$	104,740	$	152,316	$	77,848	$	82,197	$	417,101

Transferred at a point-in-time	$	96	$	704	$	—	$	11,721	$	12,521
Transferred over time	104,644		151,612		77,848		70,476		404,580
Total revenues	$	104,740	$	152,316	$	77,848	$	82,197	$	417,101

BUSINESS COMBINATIONS - Schedule of Unaudited Pro forma Combined Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Revenues	$ 457,328	$ 444,449
Operating income	4,855	4,008
Net loss	$ (5,539)	$ (4,496)
Basic and diluted loss per share attributable to common stockholders:
Weighted average common shares outstanding basic (in shares)	63,544	63,387
Weighted average common shares outstanding diluted (in shares)	63,544	63,387
Basic earnings per common share (in dollars per share)	$ (0.09)	$ (0.07)
Diluted earnings per common share (in dollars per share)	$ (0.09)	$ (0.07)

SEGMENT REPORTING - Schedule of Revenues Attributable to Services Provided (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue from External Customer [Line Items]
Revenues	$ 457,328	$ 417,101
Solid waste
Revenue from External Customer [Line Items]
Revenues	368,529	334,904
Collection
Revenue from External Customer [Line Items]
Revenues	309,652	276,461
Disposal
Revenue from External Customer [Line Items]
Revenues	49,511	48,485
Transportation
Revenue from External Customer [Line Items]
Revenues	4,647	5,214
Landfill gas-to-energy
Revenue from External Customer [Line Items]
Revenues	2,935	2,765
Processing
Revenue from External Customer [Line Items]
Revenues	1,784	1,979
Resource Solutions
Revenue from External Customer [Line Items]
Revenues	88,799	82,197
Processing
Revenue from External Customer [Line Items]
Revenues	43,315	44,516
National Accounts
Revenue from External Customer [Line Items]
Revenues	$ 45,484	$ 37,681

DEBT - Narrative - Cash Flow Hedges (Details) - Interest Rate Contract - Cash Flow Hedging - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Notional amount	$ 515,000	$ 515,000
Floor interest rate	0.00%
Weighted average percentage rate paid	3.626%

LOSS PER SHARE

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

LOSS PER SHARE

Basic loss per share attributable to common stockholders is computed by dividing net loss by the weighted average common shares outstanding during the period. Diluted earnings per share is calculated based on the combined weighted average number of common shares and potentially dilutive shares, which include the assumed exercise of employee stock options, unvested restricted stock awards, unvested restricted stock units and unvested performance stock units, including market-based performance units based on the expected achievement of performance targets. In computing diluted earnings per share, we utilize the treasury stock method.

A summary of the numerator and denominators used in the computation of loss per share attributable to common stockholders follows:


	Three Months Ended March 31,
	2026		2025
Numerator:
Net loss	$	(5,539)	$	(4,810)
Denominators:
Number of shares outstanding, end of period:
Class A common stock	62,622		62,475
Class B common stock	988		988


Effect of weighted average shares outstanding	(66)		(76)
Basic weighted average common shares outstanding	63,544		63,387
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	—		—
Diluted weighted average common shares outstanding	63,544		63,387
Anti-dilutive potentially issuable shares	441		422

ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 192,722	$ 172,230
Obligations incurred	2,938	1,698
Accretion expense	3,951	3,654
Obligations settled	(781)	(755)
Ending balance	$ 198,830	$ 176,827

OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands	3 Months Ended
OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Unusual or Infrequent Items, or Both [Abstract]
Expense from acquisition activities	$ 6,509	$ 5,529
Organics facility closure charge	$ 927	$ 0

STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2024
Limited Partners' Capital Account [Line Items]
Expiration period	10 years
Unrecognized stock-based compensation, weighted average period	1 year 8 months 12 days
Fair value of stock awards vested	$ 3,724
Stock Options
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	133	$ 133
Unrecognized stock-based compensation expense, stock options	855
Aggregate intrinsic value of options exercised	$ 0
Restricted Stock \| Non Employee Director
Limited Partners' Capital Account [Line Items]
Award vesting period	3 years
Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	$ 10,469
Restricted Stock Unit \| Non Employee Director
Limited Partners' Capital Account [Line Items]
Award service period	3 years
Restricted Stock Awards, Restricted Stock Units And Performance Stock Units
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	$ 2,494	4,609
Performance Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	$ 14,704
Market-based Performance Stock Units
Limited Partners' Capital Account [Line Items]
Weighted average fair value of market-based performance (in dollars per share)	$ 98.60
Risk-free interest rate	3.72%
Expected volatility	25.60%
Minimum
Limited Partners' Capital Account [Line Items]
Award vesting period	1 year
Maximum
Limited Partners' Capital Account [Line Items]
Award vesting period	5 years
Weighted average \| Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period	2 years 3 months 18 days
Weighted average \| Performance Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period	2 years 1 month 6 days
Amended and Restated 1997 Employee Stock Purchase Plan
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	$ 239	$ 169
Class A Common Stock
Limited Partners' Capital Account [Line Items]
Common stock, authorized shares (in shares)			4,000
Class A Common Stock \| Amended 2016 Plan
Limited Partners' Capital Account [Line Items]
Common stock, authorized shares (in shares)			1,750
Class A Common Stock \| 2016 Plan
Limited Partners' Capital Account [Line Items]
Common stock, authorized shares (in shares)			2,250
Number of shares available for future grant (in shares)	1,857
Class A Common Stock \| 2006 Incentive Plan
Limited Partners' Capital Account [Line Items]
Common stock, additional authorized shares (in shares)			2,723

STOCKHOLDERS' EQUITY - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (15,326)	$ (14,980)
Loss before income taxes	(8,824)	(8,135)
Benefit for income taxes	(3,285)	(3,325)
Net loss	(5,539)	(4,810)
Interest Rate Swaps \| Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income, Net of Tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(201)	(1,011)
Loss before income taxes	201	1,011
Benefit for income taxes	59	297
Net loss	$ 142	$ 714

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands	Jan. 12, 2026	Mar. 31, 2026
Environmental Remediation Site [Domain]
Loss contingency accrual		$ 2,265
Capitalized landfill project development costs		$ 13,480
Risk free interest		1.80%
NHDES, Letter of Deficiency
Environmental Remediation Site [Domain]
Litigation settlement, amount awarded	$ 1,900

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

STOCKHOLDERS' EQUITY

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

STOCKHOLDERS' EQUITY

Stock Based Compensation

Shares Available For Issuance

In fiscal year 2024, our stockholders approved the amendment and restatement of our 2016 Incentive Plan (“Amended 2016 Plan”). Under the Amended 2016 Plan, we may grant awards up to an aggregate amount of shares equal to the sum of: (A) 4,000 shares of Class A common stock (subject to adjustment in the event of stock splits and other similar events) which is comprised of: (i) 1,750 shares of Class A common stock reserved for the issuance in connection with the Amended 2016 Plan, plus (ii) 2,250 shares of Class A common stock originally reserved for issuance under the 2016 Incentive Plan; plus (B) such additional number of shares of Class A common stock (up to approximately 2,723 shares) as is equal to the sum of the number of shares of Class A common stock that remained available for grant under the 2006 Stock Incentive Plan (“2006 Plan”) immediately prior to the expiration of the 2006 Plan and the number of shares of Class A common stock subject to awards granted under the 2006 Plan that expire, terminate or are otherwise surrendered, canceled, forfeited or repurchased by us. As of March 31, 2026, there were 1,857 Class A common stock equivalents available for future grant under the Amended 2016 Plan.

Stock Options

Stock options are granted at a price equal to the prevailing fair value of our Class A common stock at the date of grant. Generally, stock options granted have a term not to exceed ten years and vest over a one-year to five-year period from the date of grant.

The fair value of each stock option granted is estimated using a Black-Scholes option-pricing model, which uses a risk-free interest rate, based on the U.S. Treasury yield curve for the period of the expected life of the stock option; and requires extensive use of accounting judgment and financial estimation, including estimates of: the expected term, calculated based on the weighted averaged historical life of vested stock options, giving consideration to vesting schedules and historical exercise patterns; and the expected volatility, calculated using the weekly historical volatility of our Class A common stock over the expected life of the stock option.

A summary of stock option activity follows:


	Stock Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2025	101	$	80.85
Granted	—	$	—
Exercised	—	$	—
Forfeited	—	$	—
Outstanding, March 31, 2026	101	$	80.85	6.5	$	89
Exercisable, March 31, 2026	60	$	80.25	6.4	$	89

Stock-based compensation expense related to stock options was $133 during the three months ended March 31, 2026, as compared to $133 during the three months ended March 31, 2025. As of March 31, 2026, we had $855 of unrecognized stock-based compensation expense related to outstanding stock options to be recognized over a weighted average period of 1.7 years.

During the three months ended March 31, 2026, the aggregate intrinsic value of stock options exercised was zero dollars.

Other Stock Awards

Restricted stock awards, restricted stock units and performance stock units, with the exception of market-based performance stock units, are granted at a price equal to the fair value of our Class A common stock at the date of grant. The fair value of each market-based performance stock unit is estimated using a Monte Carlo pricing model, which requires extensive use of accounting judgment and financial estimation, including the estimated share price appreciation plus, if applicable, the value of dividends of our Class A common stock as compared to the Russell 2000 Index over the requisite service period.

Typically, restricted stock awards granted to non-employee directors vest incrementally over a three-year period beginning on the first anniversary of the date of grant. Restricted stock units granted to non-employee directors vest in full on the first anniversary of the grant date. Restricted stock units granted to employees vest incrementally over an identified service period, typically three years, beginning on the grant date based on continued employment. Performance stock units granted to employees, including market-based performance stock units, vest at a future date following the grant date and are based on the attainment of performance targets and market achievements, as applicable.

A summary of restricted stock award, restricted stock unit and performance stock unit activity follows:


	Restricted Stock Awards, Restricted Stock Units, and Performance Stock Units (1)	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2025	207	$	104.73
Granted	135	$	95.17
Class A Common Stock Vested	(41)	$	92.49
Forfeited	(8)	$	110.63
Outstanding, March 31, 2026	293	$	101.90	2.2	$	23,241
Unvested, March 31, 2026	530	$	103.90	2.1	$	42,020

Stock-based compensation expense related to restricted stock awards, restricted stock units and performance stock units was $2,494 during the three months ended March 31, 2026, as compared to $4,609 during the three months ended March 31, 2025.

During the three months ended March 31, 2026, the total fair value of other stock awards vested was $3,724.

As of March 31, 2026, total unrecognized stock-based compensation expense related to outstanding restricted stock units was $10,469, which is to be recognized over a weighted average period of 2.3 years. As of March 31, 2026, total expected unrecognized stock-based compensation expense related to outstanding performance stock units was $14,704, which is to be recognized over a weighted average period of 2.1 years.

The weighted average fair value of market-based performance stock units granted during the three months ended March 31, 2026 was $98.60 per award, which was calculated using a Monte Carlo pricing model assuming a risk-free interest rate of 3.72% and an expected volatility of 25.6% assuming no expected dividend yield. Risk-free interest rate is based on the U.S. Treasury yield curve for the expected service period of the award. Expected volatility is calculated using the daily volatility of our Class A common stock over the expected service period of the award.

The Monte Carlo pricing model requires extensive use of accounting judgment and financial estimation. Application of alternative assumptions could produce significantly different estimates of the fair value of stock-based compensation and consequently, the related amounts recognized in the consolidated statements of operations.

We also recorded $239 of stock-based compensation expense related to the Second Amended and Restated 1997 Employee Stock Purchase Plan during the three months ended March 31, 2026, as compared to $169 during the three months ended March 31, 2025.

Accumulated Other Comprehensive Loss, Net of Tax

A summary of the changes in the balances of each component of accumulated other comprehensive loss, net of tax follows:



	Interest Rate Swaps
Balance, December 31, 2025	$	(3,955)

Other comprehensive income before reclassifications	3,429
Interest rate swap amounts reclassified into interest expense	(201)
Income tax provision related to items of other comprehensive loss	(969)
Other comprehensive income, net of tax	2,259
Balance, March 31, 2026	$	(1,696)

A summary of reclassifications out of accumulated other comprehensive (loss) income, net of tax into earnings follows:


	Three Months Ended March 31,
	2026		2025
Accumulated Other Comprehensive (Loss) Income, Net of Tax	Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income, Net of Tax				Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	(201)	$	(1,011)		Interest expense
	201		1,011			Loss before income taxes
	59		297			Benefit for income taxes
	$	142	$	714		Net loss

COVER - shares	3 Months Ended
COVER - shares	Mar. 31, 2026	Apr. 15, 2026
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	000-23211
Entity Registrant Name	CASELLA WASTE SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	03-0338873
Entity Address, Address Line One	25 Greens Hill Lane,
Entity Address, City or Town	Rutland,
Entity Address, State or Province	VT
Entity Address, Postal Zip Code	05701
City Area Code	802
Local Phone Number	775-0325
Title of 12(b) Security	Class A common stock, $0.01 par value per share
Trading Symbol	CWST
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000911177
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		62,621,741
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		988,200

DEBT - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt And Derivatives Disclosure [Abstract]
Cash and cash equivalents	$ 126,903	$ 123,773
Restricted cash - non-current	0	93,086
Cash, cash equivalents and restricted cash - non-current	$ 126,903	$ 216,859	$ 269,899	$ 383,303

FAIR VALUE OF FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

We use a three-tier fair value hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis, as well as assets and liabilities measured at fair value on a non-recurring basis, in periods subsequent to their initial measurement. These tiers include: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; and Level 3, defined as unobservable inputs that are not corroborated by market data.

We use valuation techniques that maximize the use of market prices and observable inputs and minimize the use of unobservable inputs. In measuring the fair value of our financial assets and liabilities, we rely on market data or assumptions that we believe market participants would use in pricing an asset or a liability.

Assets and Liabilities Accounted for at Fair Value

Our financial instruments include cash, cash equivalents and non-current restricted cash, accounts receivable, restricted investment securities held in trust on deposit with various banks as collateral for our obligations relative to our landfill final capping, closure and post-closure costs, interest rate derivatives, trade payables and debt. The carrying values of cash, cash equivalents and non-current restricted cash, accounts receivable and trade payables approximate their respective fair values due to their short-term nature. The fair value of restricted investment securities held in trust, which are valued using quoted market prices, are included as restricted assets in the Level 1 tier below. The fair value of the interest rate derivatives included in the Level 2 tier below is calculated using discounted cash flow valuation methodologies based upon Term SOFR yield curves that are observable at commonly quoted intervals for the full term of the swaps. We recognize all derivatives accounted for on the consolidated balance sheets at fair value.

Recurring Fair Value Measurements

Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis follow:


	Fair Value Measurement at March 31, 2026 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted investment securities - landfill closure	$	2,951	$	—	$	—
Interest rate swaps	—		3,064		—

	$	2,951	$	3,064	$	—

Liabilities:

Interest rate swaps	$	—	$	5,342	$	—


	Fair Value Measurement at December 31, 2025 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:


Restricted investment securities - landfill closure	$	3,179	$	—	$	—
Interest rate swaps	—		2,916		—
	$	3,179	$	2,916	$	—
Liabilities:

Interest rate swaps	$	—	$	8,421	$	—

Fair Value of Debt

As of March 31, 2026, the carrying value of our Term Loan Facility was $800,000 and the carrying value of our Revolving Credit Facility was zero dollars. Their fair values are based on current borrowing rates for similar types of borrowing arrangements, or Level 2 inputs, and approximate their carrying values.

As of March 31, 2026, the fair value of the Industrial Revenue Bonds was approximately $278,508 and the carrying value was $273,500. The fair value of the Industrial Revenue Bonds is considered to be Level 2 within the fair value hierarchy as the fair value is determined using market approach pricing provided by a third-party that utilizes pricing models and pricing systems, mathematical tools and judgment to determine the evaluated price for the security based on the market information of each of the bonds or securities with similar characteristics.

Although we have determined the estimated fair value amounts of the Industrial Revenue Bonds using available market information and commonly accepted valuation methodologies, a change in available market information, and/or the use of different assumptions and/or estimation methodologies could have a material effect on the estimated fair values. These amounts have not been revalued, and current estimates of fair value could differ significantly from the amounts presented.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (h)
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
-SubTopic 820
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

DEBT - Schedule of Cash Flow Hedges (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive loss, net of tax	$ (1,696)	$ (3,955)
Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	3,064	2,916
Cash flow hedge derivatives, gross liability	5,342	8,421
Accumulated other comprehensive loss, net of tax	(2,278)	(5,505)
Accumulated other comprehensive loss, net of tax	582	1,550
Accumulated other comprehensive loss, net of tax	(1,696)	(3,955)
Other current assets \| Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	2,133	2,081
Other non-current assets \| Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	931	835
Other accrued liabilities \| Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross liability	2,228	3,073
Other long-term liabilities \| Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross liability	$ 3,114	$ 5,348

ACCOUNTING CHANGES (Tables)

3 Months Ended

Mar. 31, 2026

Accounting Changes and Error Corrections [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

ASU No. 2024-03: Improvements to Income Statement - Expense Disaggregation Disclosures (Subtopic 220-40)

ASU No. 2025-06: Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40)

ASU No. 2025-09: Derivatives and Hedging (Topic 815)

GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 18,376	$ 19,466

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Topic 230
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2003/role/exampleRef
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
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-URI https://asc.fasb.org/1943274/2147476148/220-40-50-12

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
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-Topic 350
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147482686/350-30-45-2

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-6

+ Details

DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended
DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Debt Instrument [Line Items]
Weighted-average discount rate - finance leases	4.708%
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.708% as of March 31, 2026	$ 89,969	$ 94,035
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Debt, less current portion	Debt, less current portion
Principal amount of debt	$ 1,164,566	$ 1,168,632
Less—unamortized debt issuance costs	13,223	13,970
Debt less unamortized debt issuance costs	1,151,343	1,154,662
Less—current maturities of debt	24,588	25,735
Debt, less current portion	$ 1,126,755	1,128,927
Secured Debt \| Term loan A facility (“Term Loan Facility”) payable quarterly beginning in the fiscal year ended December 31, 2027 with balance due September 2029; bearing interest at 5.218% as of March 31, 2026
Debt Instrument [Line Items]
Stated interest rate	5.218%
Principal amount of debt	$ 800,000	800,000
Line of Credit \| Revolving Credit Facility due September 2029; bearing interest at term secured overnight financing rate (“Term SOFR”) plus 1.550%
Debt Instrument [Line Items]
Variable rate margin	1.55%
Principal amount of debt	$ 0	0
Unsecured Debt
Debt Instrument [Line Items]
Principal amount of debt	$ 273,500
Unsecured Debt \| New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 (“New York Bonds 2014R-1”) due December 2044 - fixed rate interest period bearing interest at 2.875% through December 2029
Debt Instrument [Line Items]
Stated interest rate	2.875%
Principal amount of debt	$ 25,000	25,000
Unsecured Debt \| New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 (“New York Bonds 2014R-2”) due December 2044 - fixed rate interest period bearing interest at 3.125% through May 2026
Debt Instrument [Line Items]
Stated interest rate	3.125%
Principal amount of debt	$ 15,000	15,000
Unsecured Debt \| New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 (“New York Bonds 2020”) due September 2050 - fixed rate interest period bearing interest at 4.250% through September 2030
Debt Instrument [Line Items]
Stated interest rate	4.25%
Principal amount of debt	$ 37,500	37,500
Unsecured Debt \| New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020R-2 (“New York Bonds 2020R-2”) due September 2050 - fixed rate interest period bearing interest at 5.125% through September 2030
Debt Instrument [Line Items]
Stated interest rate	5.125%
Principal amount of debt	$ 35,000	35,000
Unsecured Debt \| Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-3 (“FAME Bonds 2015R-3”) due August 2035 - fixed rate interest period bearing interest at 5.000% through August 2035
Debt Instrument [Line Items]
Stated interest rate	5.00%
Principal amount of debt	$ 29,000	29,000
Unsecured Debt \| Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2024 (“FAME Bonds 2024”) due December 2047 - fixed rate interest period bearing interest at 4.625% through May 2035
Debt Instrument [Line Items]
Stated interest rate	4.625%
Principal amount of debt	$ 45,000	45,000
Unsecured Debt \| Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 (“Vermont Bonds 2013”) due April 2036 - fixed rate interest period bearing interest at 4.625% through April 2028
Debt Instrument [Line Items]
Stated interest rate	4.625%
Principal amount of debt	$ 16,000	16,000
Unsecured Debt \| Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 (“Vermont Bonds 2022A-1”) due June 2052 - fixed rate interest period bearing interest at 5.000% through May 2027
Debt Instrument [Line Items]
Stated interest rate	5.00%
Principal amount of debt	$ 35,000	35,000
Unsecured Debt \| Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds Series 2022A-2 (“Vermont Bonds 2022A-2”) due June 2052 - fixed rate interest period bearing interest at 4.375% through May 2032
Debt Instrument [Line Items]
Stated interest rate	4.375%		4.375%
Principal amount of debt	$ 25,000	25,000
Unsecured Debt \| Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 (“New Hampshire Bonds”) due April 2029 - fixed rate interest period bearing interest at 2.950% through April 2029
Debt Instrument [Line Items]
Stated interest rate	2.95%
Principal amount of debt	$ 11,000	11,000
Notes payable with no stated interest rate maturing through September 2028
Debt Instrument [Line Items]
Principal amount of debt	$ 1,097	$ 1,097

SEGMENT REPORTING

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

SEGMENT REPORTING

We report selected information about our reportable operating segments in a manner consistent with that used for internal management reporting. We classify our solid waste operations on a geographic basis through three regional operating segments, the Eastern, Western and Mid-Atlantic regions. Revenues associated with our solid waste operations are derived mainly from solid waste (i) collection and (ii) disposal services, which include landfill and transfer station services, as well as (iii) transportation, (iv) landfill gas-to-energy and (v) processing services in the eastern United States.

Our Resource Solutions operating segment leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Revenues associated with our Resource Solutions operations are comprised of processing services and our National Accounts business. Revenues from processing services are derived from customers in the form of processing fees, tipping fees, commodity sales, and organic material related brokerage services and sales. Revenues from our National Accounts business are derived from brokerage services and overall resource management services providing a wide range of environmental services and resource management solutions to large and complex organizations, as well as traditional collection, disposal and recycling services provided to large account multi-site customers. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment, which is not a reportable operating segment.

For comparative purposes, summarized financial information by segment reported in the three months ended March 31, 2025 has been updated in the table below as we have voluntarily corrected certain amounts related to an immaterial error in previously issued segment footnote disclosure by reclassifying certain intercompany amounts from contra-revenue recorded in our Eastern and Western regions to costs of operations for those same regions, with no impact on any measure of segment operating income (loss) or our consolidated balance sheet, earnings, or cash flows.

See Note 5, Goodwill and Intangible Assets for the breakout of goodwill by reportable operating segment.

The accounting policies of our reportable operating segments are the same as those described in Item 8. “Financial Statements and Supplementary Data” of our 2025 Form 10-K. Our President and Chief Executive Officer is our chief operating decision maker (“CODM”). Our CODM uses operating income in evaluating reportable operating segment performance in order to properly allocate resources and make key operating decisions. Intercompany revenues and expenses are eliminated in the computation of consolidated gross revenues and operating income.

The CODM uses operating income for each reportable operating segment in the annual budget and forecasting process and considers budget-to-actual and forecast-to-actual variances on a monthly basis when making decisions about the allocation of operating and capital resources to each reportable operating segment.

Summarized financial information concerning our reportable segments for the three months ended March 31, 2026 and 2025 follows:

Three Months Ended March 31, 2026


	Eastern		Western		Mid-Atlantic		Solid Waste Subtotal		Resource Solutions		Corporate Entities		Eliminations		Consolidated
Third-party revenues	$	111,287	$	162,448	$	94,794	$	368,529	$	88,799	$	—	$	—	$	457,328
Intercompany revenues	27,510		59,992		6,542		94,044		5,798		—		(99,842)		—
Gross revenues	138,797		222,440		101,336		462,573		94,597		—		(99,842)		457,328
Cost of operations	100,901		151,775		76,322		328,998		78,859		912		(99,842)		308,927
General and administration	6,591		8,397		5,959		20,947		5,451		31,730		—		58,128
Depreciation and amortization	17,156		32,457		21,151		70,764		5,196		2,022		—		77,982
Expense from acquisition activities	64		122		1,716		1,902		17		4,590		—		6,509

Organics facility closure charge	—		—		—		—		927		—		—		927

Operating income (loss)	$	14,085	$	29,689	$	(3,812)	$	39,962	$	4,147	$	(39,254)	$	—	4,855
Interest expense, net															13,993
Other income															(314)
Loss before income taxes															$	(8,824)
Interest expense, net	$	384	$	238	$	385	$	1,007	$	22	$	12,964	$	—	$	13,993
Capital expenditures	$	7,675	$	16,078	$	20,903	$	44,656	$	1,716	$	3,607	$	—	$	49,979
Total assets	$	549,868	$	1,117,182	$	1,134,439	$	2,801,489	$	277,422	$	191,538	$	—	$	3,270,449

Three Months Ended March 31, 2025


	Eastern		Western		Mid-Atlantic		Solid Waste Subtotal		Resource Solutions		Corporate Entities		Eliminations		Consolidated
Third-party revenues	$	104,740	$	152,316	$	77,848	$	334,904	$	82,197	$	—	$	—	$	417,101
Intercompany revenues	26,289		53,726		1,813		81,828		3,476		—		(85,304)		—
Gross revenues	131,029		206,042		79,661		416,732		85,673		—		(85,304)		417,101
Cost of operations	95,653		140,412		59,172		295,237		70,032		487		(85,304)		280,452
General and administration	6,053		9,169		4,000		19,222		4,541		32,723		—		56,486
Depreciation and amortization	16,109		30,360		18,261		64,730		5,134		1,627		—		71,491

Expense from acquisition activities	396		844		2,414		3,654		992		883		—		5,529




Operating income (loss)	$	12,818	$	25,257	$	(4,186)	$	33,889	$	4,974	$	(35,720)	$	—	3,143
Interest expense, net															11,598
Other income															(320)
Loss before income taxes															$	(8,135)
Interest expense, net	$	226	$	221	$	55	$	502	$	26	$	11,070	$	—	$	11,598
Capital expenditures	$	8,103	$	15,200	$	25,633	$	48,936	$	4,070	$	2,469	$	—	$	55,475
Total assets	$	538,730	$	1,131,276	$	921,155	$	2,591,161	$	276,983	$	337,726	$	—	$	3,205,870

A summary of our revenues attributable to services provided follows:


	Three Months Ended March 31,
	2026		2025
Collection	$	309,652	$	276,461
Disposal (1)	49,511		48,485
Transportation (1)	4,647		5,214
Landfill gas-to-energy	2,935		2,765
Processing	1,784		1,979
Solid waste	368,529		334,904
Processing (2)	43,315		44,516
National Accounts (2)	45,484		37,681
Resource Solutions	88,799		82,197
Total revenues	$	457,328	$	417,101

(1)In the three months ended March 31, 2026, we revised the presentation of our service lines to remove the transportation service line from the disposal caption and present it separately. Disposal now consists of the landfill and transfer station service lines. Prior period information has been updated to conform to the current period presentation.

(2)In the three months ended March 31, 2026, we realigned a business unit related to organic materials brokerage operations within our Resource Solutions operating segment from the National Accounts service line to the processing service line. Certain prior period amounts have been reclassified between service lines to conform to the current period presentation.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-15

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-Topic 280
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

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-Name Accounting Standards Codification
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-Topic 280
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+ Details

LOSS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Earnings (Loss) per Share Computation

A summary of the numerator and denominators used in the computation of loss per share attributable to common stockholders follows:


	Three Months Ended March 31,
	2026		2025
Numerator:
Net loss	$	(5,539)	$	(4,810)
Denominators:
Number of shares outstanding, end of period:
Class A common stock	62,622		62,475
Class B common stock	988		988


Effect of weighted average shares outstanding	(66)		(76)
Basic weighted average common shares outstanding	63,544		63,387
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	—		—
Diluted weighted average common shares outstanding	63,544		63,387
Anti-dilutive potentially issuable shares	441		422

GOODWILL AND INTANGIBLE ASSETS

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

A summary of the activity and balances related to goodwill by reportable operating segment is as follows:


	December 31, 2025		Acquisitions		Business Combination Adjustments		March 31, 2026
Eastern	$	110,533	$	—	$	—	$	110,533
Western	371,035		—		573		371,608
Mid-Atlantic	584,136		73,471		—		657,607
Resource Solutions	54,352		—		—		54,352

	$	1,120,056	$	73,471	$	573	$	1,194,100

Summaries of intangible assets by type follow:


	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, March 31, 2026
Intangible assets	$	74,892	$	427,625	$	26,309	$	528,826
Less accumulated amortization	(45,210)		(191,816)		(19,321)		(256,347)
	$	29,682	$	235,809	$	6,988	$	272,479


	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, December 31, 2025
Intangible assets	$	74,892	$	427,625	$	26,309	$	528,826
Less accumulated amortization	(43,041)		(176,824)		(18,106)		(237,971)
	$	31,851	$	250,801	$	8,203	$	290,855

Intangible amortization expense was $18,376 and $19,466 during the three months ended March 31, 2026 and March 31, 2025, respectively.

Based on the amortizable intangible assets recorded in the consolidated balance sheets at March 31, 2026, intangible amortization expense for each of the next five fiscal years and thereafter is estimated as follows:



Estimated Future Intangible Amortization Expense as of March 31, 2026
For the remainder of the fiscal year ending December 31, 2026	$	51,545
Fiscal year ending December 31, 2027	$	61,057
Fiscal year ending December 31, 2028	$	51,960
Fiscal year ending December 31, 2029	$	40,158
Fiscal year ending December 31, 2030	$	28,528
Thereafter	$	39,231

COMMITMENTS AND CONTINGENCIES - Schedule of Environmental Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 4,988	$ 5,532
Accretion expense	22	23
Obligations settled	(69)	(12)
Ending balance	4,941	5,543
Less: current portion	$ 1,239	$ 1,585
Environmental Loss Contingency, Current, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Less: current portion	Less: current portion
Long-term portion	$ 3,702	$ 3,958
Environmental Loss Contingency, Noncurrent, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Long-term portion	Long-term portion

STOCKHOLDERS' EQUITY - Schedule of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) $ / shares shares
Stock Options
Beginning balance, outstanding (in shares) \| shares	101
Granted (in shares) \| shares	0
Exercised (in shares) \| shares	0
Forfeited (in shares) \| shares	0
Ending balance, outstanding (in shares) \| shares	101
Exercisable at end of period (in shares) \| shares	60
Weighted Average Exercise Price
Beginning balance, outstanding (in dollars per share) \| $ / shares	$ 80.85
Granted (in dollars per share) \| $ / shares	0
Exercised (in dollars per share) \| $ / shares	0
Forfeited (in dollars per share) \| $ / shares	0
Ending balance, outstanding (in dollars per share) \| $ / shares	80.85
Exercisable at end of period (in dollars per share) \| $ / shares	$ 80.25
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Outstanding contractual term	6 years 6 months
Exercisable contractual term	6 years 4 months 24 days
Outstanding aggregate intrinsic value \| $	$ 89
Exercisable aggregate intrinsic value \| $	$ 89

STOCKHOLDERS' EQUITY - Schedule of Restricted Stock Awards, Restricted Stock Unit and Performance-based Stock Unit Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) $ / shares shares
Restricted Stock Awards, Restricted Stock Units And Performance Stock Units
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Outstanding, beginning of period (in shares)	207
Granted (in shares)	135
Forfeited (in shares)	(8)
Outstanding, end of period (in shares)	293
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) \| $ / shares	$ 104.73
Granted (in dollars per share) \| $ / shares	95.17
Forfeited (in dollars per share) \| $ / shares	110.63
Outstanding at end of period (in dollars per share) \| $ / shares	$ 101.90
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Contractual term (in years)	2 years 2 months 12 days
Aggregate intrinsic value \| $	$ 23,241
Restricted Stock Awards, Restricted Stock Units And Performance Stock Units \| Class A Common Stock
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Class A Common Stock Vested (in shares)	(41)
Weighted Average Grant Date Fair Value
Class A Common Stock Vested (in dollars per share) \| $ / shares	$ 92.49
Performance Stock Unit
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Percentage of attainment level	100.00%
Performance Stock Unit \| Class A Common Stock
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Number of additional shares (in shares)	237
Unvested \| Restricted Stock Awards, Restricted Stock Units And Performance Stock Units
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Outstanding, end of period (in shares)	530
Weighted Average Grant Date Fair Value
Outstanding at end of period (in dollars per share) \| $ / shares	$ 103.90
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Contractual term (in years)	2 years 1 month 6 days
Aggregate intrinsic value \| $	$ 42,020

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
CURRENT ASSETS:
Cash and cash equivalents	$ 126,903	$ 123,773
Accounts receivable, net of allowance for credit losses of $7,340 and $7,082, respectively	175,397	178,068
Prepaid expenses	19,907	29,930
Other current assets	37,489	37,510
Total current assets	359,696	369,281
Property and equipment, net of accumulated depreciation and amortization of $1,551,756 and $1,495,563, respectively	1,304,744	1,289,409
Operating lease right-of-use assets	104,246	105,252
Goodwill	1,194,100	1,120,056
Intangible assets, net	272,479	290,855
Restricted cash and assets	2,951	96,265
Cost method investments	10,967	10,967
Other non-current assets	21,266	21,241
Total assets	3,270,449	3,303,326
CURRENT LIABILITIES:
Current maturities of debt	24,588	25,735
Current operating lease liabilities	11,739	11,952
Accounts payable	89,972	102,468
Accrued payroll and related expenses	19,934	36,316
Contract liabilities	45,706	45,153
Current accrued final capping, closure and post-closure costs	7,435	7,562
Other accrued liabilities	60,614	64,716
Total current liabilities	259,988	293,902
Debt, less current portion	1,126,755	1,128,927
Operating lease liabilities, less current portion	73,701	72,513
Accrued final capping, closure and post-closure costs, less current portion	191,395	185,160
Deferred income taxes	16,708	18,965
Other long-term liabilities	33,610	35,150
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Additional paid-in capital	1,700,005	1,697,143
Accumulated deficit	(130,653)	(125,114)
Accumulated other comprehensive loss, net of tax	(1,696)	(3,955)
Total stockholders' equity	1,568,292	1,568,709
Total liabilities and stockholders' equity	3,270,449	3,303,326
Class A Common Stock
STOCKHOLDERS' EQUITY:
Common stock	626	625
Class B Common Stock
STOCKHOLDERS' EQUITY:
Common stock	$ 10	$ 10

LOSS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended
LOSS PER SHARE (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Numerator:
Net loss	$ (5,539)	$ (4,810)
Denominators:
Effect of weighted average shares outstanding (in shares)	(66,000)	(76,000)
Basic weighted average common shares outstanding (in shares)	63,544,000	63,387,000
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards (in shares)	0	0
Diluted weighted average common shares outstanding (in shares)	63,544,000	63,387,000
Anti-dilutive potentially issuable shares (in shares)	441,000	422,000
Class A Common Stock
Denominators:
Common stock, shares outstanding (in shares)	62,622,000	62,475,000	62,526,000
Class B Common Stock
Denominators:
Common stock, shares outstanding (in shares)	988,000	988,000	988,000

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Revenues	$ 457,328	$ 417,101
Operating expenses:
Cost of operations	308,927	280,452
General and administration	58,128	56,486
Depreciation and amortization	77,982	71,491
Expense from acquisition activities	6,509	5,529
Organics facility closure charge	927	0
Total operating expenses	452,473	413,958
Operating income	4,855	3,143
Other expense (income):
Interest expense	15,326	14,980
Interest income	(1,333)	(3,382)
Other income	(314)	(320)
Other expense, net	13,679	11,278
Loss before income taxes	(8,824)	(8,135)
Benefit for income taxes	(3,285)	(3,325)
Net loss	$ (5,539)	$ (4,810)
Basic and diluted loss per share attributable to common stockholders:
Weighted average common shares outstanding basic (in shares)	63,544	63,387
Weighted average common shares outstanding diluted (in shares)	63,544	63,387
Basic loss per common share (in dollars per share)	$ (0.09)	$ (0.08)
Diluted loss per common share (in dollars per share)	$ (0.09)	$ (0.08)

COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

In the ordinary course of our business and as the result of the extensive governmental regulation of the solid waste industry, we are subject to various judicial and administrative proceedings involving state and local agencies. In these proceedings, an agency may seek to impose fines or to revoke or deny renewal of an operating permit held by us. From time to time, we may also be subject to actions brought by special interest or other groups, adjacent landowners or residents in connection with the permitting and licensing of landfills and transfer stations, or allegations of environmental damage or violations of the permits and licenses pursuant to which we operate. In addition, we may be named defendants in various claims and suits pending for alleged damages to persons and property, alleged violations of certain laws and alleged liabilities arising out of matters occurring during the ordinary operation of a waste management business. The plaintiffs in some actions seek unspecified damages or injunctive relief, or both. These actions fall within various procedural stages at any point in time, and some are covered in part by insurance.

In accordance with FASB ASC 450 - Contingencies, we accrue for legal proceedings, inclusive of legal costs, when losses become probable and reasonably estimable. We have recorded an aggregate accrual, net of payments of $2,265 relating to our outstanding legal proceedings as of March 31, 2026 and it is at least reasonably possible that a change in estimate will occur in the near-term. As of the end of each applicable reporting period, we review each of our legal proceedings to determine whether it is probable, reasonably possible or remote that a liability has been incurred and, if it is at least reasonably possible, whether a range of loss can be reasonably estimated under the provisions of FASB ASC Subtopic 450-20. In instances where we determine that a loss is probable and we can reasonably estimate a range of loss we may incur with respect to such a matter, we record an accrual for the amount within the range that constitutes our best estimate of the possible loss. If we are able to reasonably estimate a range, but no amount within the range appears to be a better estimate than any other, we record an accrual in the amount that is the low end of such range. When a loss is reasonably possible, but not probable, we will not record an accrual, but we will disclose our estimate of the possible range of loss where such estimate can be made in accordance with FASB ASC 450-20. We disclose outstanding matters that we believe could have a material adverse effect on our financial condition, results of operations or cash flows.

North Country Environmental Services Letter of Deficiency

On June 14, 2024, our subsidiary, North Country Environmental Services, Inc. (“NCES”), received a Letter of Deficiency (the “Letter”) from the New Hampshire Department of Environmental Services (“NHDES”) concerning alleged violations related to leachate management and leachate data and reporting. The Letter required certain actions to correct the deficiencies on a prescribed timeline, and NCES has met the deadlines for information submission. On January 12, 2026, the New Hampshire Department of Justice and NCES entered into a Consent Decree resolving the alleged violations and requiring the payment of a $1,900 civil penalty, part of which may be offset through approved Supplemental Environmental Projects focused on stabilizing landfill debris impacting the Saco River, of which one such project has already been implemented. The Consent Decree is subject to court approval. The terms of the settlement allow for us to receive a credit towards the penalty for field work costs associated with a Supplemental Environmental Project. The accrual has been reduced to account for these sums that have already been paid.

Granite State Landfill Solid Waste Permit Denial

On April 3, 2025, NHDES denied the October 31, 2023 application of our subsidiary, Granite State Landfill, LLC (“GSL”), for the development of new landfill capacity in New Hampshire. On April 8, 2025, GSL filed a Petition for Declaratory Judgment in the Merrimack Superior Court (“Court”) requesting that the Court find that NHDES’s denial of GSL’s application was unlawful (“Petition”). On May 9, 2025, NHDES filed an Answer to the Petition. On June 23, 2025, North Country Alliance for Balanced Change (“NCABC”) filed a Motion to Intervene, in response to which GSL filed an Objection on June 30, 2025. On July 1, 2025, a scheduling conference was held and the Court issued a Scheduling Order of the same date providing that the issues raised in the Petition appear to be a legal dispute that can be addressed by cross-motions for summary judgment, and requiring the parties to confer and submit briefing schedule proposals to the Court on or before July 18, 2025. A Joint Proposed Briefing Schedule was filed by the parties on July 17, 2025. NCABC filed a reply to GSL’s Objection to NCABC’s Motion to Intervene on July 25, 2025. On August 5, 2025, the Court issued an order granting NCABC’s Motion to Intervene. GSL timely moved for reconsideration of that order, which was denied on September 2, 2025. GSL then filed a Motion for an Interlocutory Appeal on September 12, 2025, to challenge NCABC’s standing to intervene. NCABC objected to the Motion for an Interlocutory Appeal on September 22, 2025. On September 15, 2025, GSL and NHDES filed cross-motions for summary judgment. NCABC joined in NHDES’s motion. GSL’s and NHDES’s objections to the cross-motions for summary judgment were submitted October 15, 2025. A hearing on the motions for summary judgment originally scheduled for February 26, 2026 has yet to be rescheduled.

On May 5, 2025, GSL and NCABC each filed a Notice of Appeal of NHDES’s denial of GSL’s application with the New Hampshire Waste Management Council (“GSL Appeal” and “NCABC Appeal”, respectively). On May 9, 2025, GSL filed a partially assented to Motion to Intervene in the NCABC Appeal, followed by a Motion to Dismiss the NCABC Appeal on June 27, 2025. NHDES filed a Motion to Dismiss the NCABC Appeal on July 17, 2025. NCABC filed an Objection to GSL’s Motion to Dismiss on July 24, 2025 and to NHDES’s Motion to Dismiss on July 28, 2025. On August 8, 2025, NCABC filed a Motion to Intervene in the GSL Appeal which will depend on the success or failure of GSL’s Motion to Dismiss the NCABC Appeal. On February 23, 2026, the Waste Management Council issued an Order declining to accept the NCABC Appeal. In response, NCABC submitted a Motion for Rehearing and Clarification along with a Revised Petition for Appeal, both dated March 16, 2026. The Waste Management Council subsequently denied NCABC’s Motion for Rehearing by Order dated March 27, 2026. The Waste Management Council held a prehearing conference for this matter on April 15, 2026, at which time NCABC’s Motion to Intervene was argued, and a deadline was set for NHDES to file additional motions concerning the GSL Appeal. NCABC’s Motion to Intervene remains under consideration. As of March 31, 2026, we had $13,480 of capitalized project development costs related to the GSL landfill project included in other non-current assets.

Juniper Ridge Landfill Public Benefit Determination Remand on Appeal

On January 7, 2026, the Penobscot Superior Court (“Superior Court”) issued a decision in the matter of Penobscot Nation & Conservation Law Foundation (“Petitioners”) v. Maine Department of Environmental Protection (“Department”), with Casella subsidiary, NEWSME Landfill Operations, LLC as Party‑in‑Interest, addressing the Petitioners’ challenge to the Department’s public benefit determination for the proposed expansion of the Subtitle D landfill located in West Old Town, Maine (“Juniper Ridge Landfill”) that we operate. The Superior Court granted Petitioners’ motion for judicial notice and found that the Department failed to make necessary factual findings regarding both the need for on‑site sludge‑drying and the cumulative environmental burdens borne by the Penobscot Nation. The Superior Court remanded the matter for the Department to make additional findings on these issues. The Department made additional findings in a revised public benefit determination submitted by the Department to the Superior Court on March 23, 2026. The matter remains pending before the Superior Court.

Environmental Remediation Liabilities

We are subject to liability for environmental damage, including personal injury and property damage, that our solid waste, recycling and power generation facilities may cause to neighboring property owners, particularly as the result of the contamination of drinking water sources or soil, possibly including damage resulting from conditions that existed before we acquired the facilities. We may also be subject to liability for similar claims arising from off-site environmental contamination caused by pollutants or hazardous substances if we or our predecessors arrange or arranged to transport, treat or dispose of those materials.

We accrue for costs associated with environmental remediation obligations when such costs become both probable and reasonably estimable. Determining the method and ultimate cost of remediation requires that a number of assumptions be made. There can sometimes be a range of reasonable estimates of the costs associated with remediation of a site. In these cases, we use the amount within the range that constitutes our best estimate. In the early stages of the remediation process, particular components of the overall liability may not be reasonably estimable; in this instance we use the components of the liability that can be reasonably estimated as a surrogate for the liability. It is reasonably possible that we will need to adjust the liabilities recorded for remediation to reflect the effects of new or additional information, to the extent such information impacts the costs, timing or duration of the required actions, which could have a material adverse effect on our consolidated financial position, results of operations and cash flows. We disclose outstanding environmental remediation matters that remain unsettled or are settled in the reporting period that we believe could have a material adverse effect on our financial condition, results of operations or cash flows.

We inflate the estimated costs in current dollars to the expected time of payment and discount the total cost to present value using a risk-free interest rate when the amount and timing of cash payments for the liability are fixed or reliably determinable. The weighted-average risk-free interest rate associated with our environmental remediation liabilities as of March 31, 2026 was approximately 1.8%.

A summary of the changes to the aggregate environmental remediation liabilities for the three months ended March 31, 2026 and 2025 follows:


	Three Months Ended March 31,
	2026		2025
Beginning balance	$	4,988	$	5,532
Accretion expense	22		23


Obligations settled (1)	(69)		(12)
Ending balance	4,941		5,543
Less: current portion	1,239		1,585
Long-term portion	$	3,702	$	3,958

(1)May include amounts that are being processed through accounts payable as a part of our disbursement cycle.

ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS

3 Months Ended

Mar. 31, 2026

Asset Retirement Obligation Disclosure [Abstract]

ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS

Accrued final capping, closure and post-closure costs include the current and non-current portion of costs associated with obligations for final capping, closure and post-closure of our landfills. We estimate our future final capping, closure and post-closure costs of our landfills in order to determine the final capping, closure and post-closure expense per ton of waste placed into each landfill. The anticipated time frame for paying these costs varies based on the remaining useful life of each landfill as well as the duration of the post-closure monitoring period.

The changes to accrued final capping, closure and post-closure liabilities are as follows:


	Three Months Ended March 31,
	2026		2025
Beginning balance	$	192,722	$	172,230
Obligations incurred	2,938		1,698

Accretion expense	3,951		3,654

Obligations settled (1)	(781)		(755)
Ending balance	$	198,830	$	176,827

(1)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.

ACCOUNTING CHANGES (Policies)

3 Months Ended

Mar. 31, 2026

Accounting Changes and Error Corrections [Abstract]

Basis of Accounting

Casella Waste Systems, Inc. (“Parent”) and its subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company. We provide resource management expertise and services to residential, commercial, municipal, institutional and industrial customers, primarily in the areas of solid waste collection and disposal, transfer, recycling and organics services.

We provide integrated solid waste services with operating locations in eleven states: Vermont, New Hampshire, New York, Massachusetts, Connecticut, Maine, Pennsylvania, New Jersey, Delaware, Maryland and West Virginia, with our headquarters located in Rutland, Vermont. We manage our solid waste operations on a geographic basis through three regional operating segments, the Eastern, Western and Mid-Atlantic regions, each of which provides a comprehensive range of non-hazardous solid waste services. We manage our resource renewal operations through the Resource Solutions operating segment, which leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment.

The accompanying unaudited consolidated financial statements, which include the accounts of the Parent and our wholly-owned subsidiaries, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). All significant intercompany accounts and transactions are eliminated in consolidation. Investments in entities in which we do not have a controlling financial interest are accounted for under either the equity method or the cost method of accounting, as appropriate. Our significant accounting policies are more fully discussed in Item 8. “Financial Statements and Supplementary Data” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, which was filed with the SEC on February 20, 2026 (“2025 Form 10-K”).

Use of Estimates

Preparation of our consolidated financial statements in accordance with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the accounting for and recognition and disclosure of assets, liabilities, equity, revenues and expenses. We must make these estimates and assumptions because certain information that we use is dependent on future events, cannot be calculated with a high degree of precision given the available data, or simply cannot be readily calculated. In the opinion of management, these consolidated financial statements include all adjustments, including normal recurring and nonrecurring adjustments, as applicable, necessary for a fair statement of the financial position, results of operations and cash flows for the periods presented. The results for the three months ended March 31, 2026 may not be indicative of the results for any other interim period or the entire fiscal year.

Subsequent Events

We have evaluated subsequent events or transactions that have occurred after the consolidated balance sheet date of March 31, 2026 through the date of filing of the consolidated financial statements with the SEC on this Quarterly Report on Form 10-Q. Except as disclosed, no material subsequent events have occurred since March 31, 2026 through the date of this filing that would require recognition or adjustments to our disclosures in our consolidated financial statements.

Accounting Standards Adopted and Pending Adoption

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

ASU No. 2024-03: Improvements to Income Statement - Expense Disaggregation Disclosures (Subtopic 220-40)

ASU No. 2025-06: Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40)

ASU No. 2025-09: Derivatives and Hedging (Topic 815)

Accrued Final Capping, Closure and Post Closure

Fair Value of Financial Instruments

Assets and Liabilities Accounted for at Fair Value

Segment Reporting

See Note 5, Goodwill and Intangible Assets for the breakout of goodwill by reportable operating segment.

- Definition

Disclosure of accounting policy for segment reporting.

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- Definition

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details)	Mar. 31, 2026 USD ($)
Carrying Value \| Secured Debt
Debt Instrument [Line Items]
Debt, fair value	$ 800,000,000
Carrying Value \| Line of Credit
Debt Instrument [Line Items]
Debt, fair value	0
Carrying Value \| Unsecured Debt
Debt Instrument [Line Items]
Debt, fair value	273,500,000
Fair Value \| Unsecured Debt
Debt Instrument [Line Items]
Debt, fair value	$ 278,508,000

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

BUSINESS COMBINATIONS - Schedule of Purchase Price Paid for Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Purchase Price:
Cash used in acquisitions, net of cash acquired of $— and $—, respectively	$ 94,561	$ 103,560
Allocated as follows:
Excess purchase price allocated to goodwill	1,194,100		$ 1,120,056
Waste Collection Acquisitions
Purchase Price:
Cash used in acquisitions, net of cash acquired of $— and $—, respectively	93,058	103,498
Cash acquired from acquisition	0	0
Settlements due from sellers	(302)	0
Total consideration	92,756	103,498
Allocated as follows:
Current assets	3,069	5,727
Land	1,389	3,160
Buildings and improvements	4,909	4,260
Machinery, equipment and other	12,373	17,895
Operating lease right-of-use assets	0	8,829
Current liabilities	(2,455)	(374)
Operating lease liabilities, less current portion	0	(8,352)
Fair value of assets acquired and liabilities assumed	19,285	56,675
Excess purchase price allocated to goodwill	73,471	46,823
Accounts receivable	3,033	5,270
Waste Collection Acquisitions \| Trade Names
Allocated as follows:
Intangible assets	0	304
Waste Collection Acquisitions \| Covenants Not-to-Compete
Allocated as follows:
Intangible assets	0	1,779
Waste Collection Acquisitions \| Customer Relationships
Allocated as follows:
Intangible assets	$ 0	$ 23,447

BASIS OF PRESENTATION (Details)	3 Months Ended
BASIS OF PRESENTATION (Details)	Mar. 31, 2026 state segment
Segment Reporting Information [Line Items]
Number of states in which entity operates \| state	11
Solid waste
Segment Reporting Information [Line Items]
Number of operating segments \| segment	3

FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Assets:
Restricted investment securities - landfill closure	$ 2,951	$ 96,265
Derivative Asset, Statement Of Financial Position Extensible Enumeration, Not Disclosed Flag	Interest rate swaps	Interest rate swaps
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets	$ 2,951	$ 3,179
Liabilities:
Interest rate swaps	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Interest rate swaps
Assets:
Interest rate swaps	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Landfill
Assets:
Restricted investment securities - landfill closure	2,951	3,179
Significant Other Observable Inputs (Level 2)
Assets:
Total assets	3,064	2,916
Liabilities:
Interest rate swaps	5,342	8,421
Significant Other Observable Inputs (Level 2) \| Interest rate swaps
Assets:
Interest rate swaps	3,064	2,916
Significant Other Observable Inputs (Level 2) \| Landfill
Assets:
Restricted investment securities - landfill closure	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Total assets	0	0
Liabilities:
Interest rate swaps	0	0
Significant Unobservable Inputs (Level 3) \| Interest rate swaps
Assets:
Interest rate swaps	0	0
Significant Unobservable Inputs (Level 3) \| Landfill
Assets:
Restricted investment securities - landfill closure	$ 0	$ 0

BUSINESS COMBINATIONS

3 Months Ended

Mar. 31, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

BUSINESS COMBINATIONS

In April 2026 we completed three acquisitions using cash on hand as well as borrowings under our revolving credit facility (“Revolving Credit Facility”), including the purchase of all of the equity interests of Star Waste Systems Holdings, LLC and related entities, with operations in eastern Massachusetts, including the greater Boston area, and southern New Hampshire.

In the three months ended March 31, 2026, we expanded our geographic footprint in our Mid-Atlantic region by acquiring the assets of a business, which consists of collection operations in West Virginia and a transfer station operation in southwestern Pennsylvania. In the three months ended March 31, 2025, we acquired three businesses: two tuck-in collection operations in our Mid-Atlantic region and a tuck-in collection operation and recycling business whose assets and liabilities are allocated between our Eastern region and Resource Solutions operating segments.

The operating results of the businesses acquired prior to March 31, 2026 have been included in the accompanying unaudited consolidated statements of operations from each date of acquisition, and each purchase price has been allocated to the net assets acquired based on fair values at the date of each acquisition with the residual amounts recorded as goodwill.

Due to the integration of certain of these businesses within our existing market areas, it is not practicable to segregate the revenue and earnings of all of the acquired businesses since their respective acquisition dates.

Purchase price allocations are based on information existing at the acquisition dates or upon closing the transactions. Acquired intangible assets other than goodwill that are subject to amortization may include customer relationships, trade names and covenants not-to-compete. Such assets are amortized over a two-year to ten-year period from the date of acquisition.

Goodwill acquired is primarily associated with the value of acquired businesses, based on current and anticipated operating performance, in excess of the specific values allocated to other assets, new growth opportunities arising from the acquisitions, and expected synergies from combining the acquired businesses with our existing operations and implementing our operating strategies. Substantially all amounts recorded to goodwill associated with acquisitions completed in the three months ended March 31, 2026 are expected to be deductible for tax purposes.

Due to the uniformity of the businesses acquired, both operationally and tangibly through the nature of the assets acquired, and intangibly, through the acquisition of customer lists, covenants not-to-compete and trade names, we believe aggregated disclosure information is more relevant and useful to financial statement users than individualized disclosure of the separate acquisitions in accordance with FASB ASC 805 - Business Combinations.

See Note 11, Other Items and Charges for disclosure regarding expense from acquisition activity.

A summary of the purchase price and the purchase price allocation for acquisitions follows:


	Three Months Ended March 31,
	2026		2025
Purchase Price:
Cash used in acquisitions, net of cash acquired of $— and $—, respectively	$	93,058	$	103,498


Settlements due from sellers	(302)		—


	$	92,756	$	103,498
Allocated as follows:
Current assets (1)	$	3,069	$	5,727




Property and equipment:
Land	1,389		3,160

Buildings and improvements	4,909		4,260
Machinery, equipment and other	12,373		17,895
Operating lease right-of-use assets	—		8,829
Intangible assets:
Trade names	—		304
Covenants not-to-compete	—		1,779
Customer relationships	—		23,447


Current liabilities	(2,455)		(374)






Operating lease liabilities, less current portion	—		(8,352)

Fair value of assets acquired and liabilities assumed	19,285		56,675

Excess purchase price allocated to goodwill	$	73,471	$	46,823

Purchase price allocations for the three months ended March 31, 2026 are preliminary and subject to revision upon finalization of third-party valuations over each respective one-year measurement period. Accordingly, the purchase price allocations for the three months ended March 31, 2026 are subject to change. Amounts in the three months ended March 31, 2025 are preliminary as disclosed based on information existing at the acquisition dates or upon closing the transaction and have since been updated based upon the finalization of third-party valuations, including the value of certain tangible and intangible assets acquired. The initial accounting for transactions that closed subsequent to March 31, 2026, but before the financial statements are issued, remains incomplete upon issuance.


	Three Months Ended March 31,
		2026		2025
Revenues		$	457,328	$	444,449
Operating income		$	4,855	$	4,008
Net loss		$	(5,539)	$	(4,496)

Basic and diluted loss per share attributable to common stockholders:



Weighted average common shares outstanding		63,544		63,387
Basic and diluted loss per common share		$	(0.09)	$	(0.07)

The unaudited pro forma results set forth in the table above have been prepared for comparative purposes only and are not necessarily indicative of the actual results of operations had the acquisitions occurred as of January 1, 2025 or of the results of our future operations. Furthermore, the unaudited pro forma results do not give effect to all cost savings or incremental costs that may occur as a result of the integration and consolidation of the completed acquisitions.

- Definition

The entire disclosure for business combination.

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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash Flows from Operating Activities:
Net loss	$ (5,539)	$ (4,810)
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	77,982	71,491
Interest accretion on landfill and environmental remediation liabilities	3,999	3,711
Amortization of debt issuance costs	746	754
Stock-based compensation	2,866	4,911
Operating lease right-of-use assets expense	5,615	4,729
Other items and charges, net	(236)	243
Deferred income taxes	(3,226)	(3,328)
Changes in assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	5,616	5,618
Landfill operating lease contract expenditures	(150)	0
Accounts payable	(12,496)	(8,083)
Prepaid expenses, inventories and other assets	10,042	2,246
Accrued expenses, contract liabilities and other liabilities	(22,966)	(27,359)
Net cash provided by operating activities	62,253	50,123
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(94,561)	(103,560)
Additions to property and equipment	(49,979)	(55,475)
Proceeds from sale of property and equipment	361	216
Net cash used in investing activities	(144,179)	(158,819)
Cash Flows from Financing Activities:
Proceeds from debt borrowings	0	25,000
Principal payments on debt	(8,030)	(28,984)
Payments of debt issuance costs	0	(724)
Net cash used in financing activities	(8,030)	(4,708)
Net decrease in cash, cash equivalents and restricted cash, including non-current	(89,956)	(113,404)
Cash, cash equivalents and restricted cash, including non-current, beginning of period	216,859	383,303
Cash, cash equivalents and restricted cash - non-current, end of period	126,903	269,899
Cash paid during the period for:
Cash interest payments	13,672	13,085
Cash income tax (refunds) payments, net	(2,057)	752
Supplemental Disclosure of Non-Cash Activities:
Right-of-use assets obtained in exchange for finance lease obligations	4,481	6,989
Right-of-use assets obtained in exchange for operating lease obligations	$ 2,830	$ 11,390

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss, Net of Tax	Class A Common Stock	Class A Common Stock Common Stock	Class B Common Stock	Class B Common Stock Common Stock
Beginning balance at Dec. 31, 2024	$ 1,550,839	$ 1,679,878	$ (132,985)	$ 3,312		$ 624		$ 10
Beginning balance (in shares) at Dec. 31, 2024						62,370,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	0	(1)				$ 1
Issuance of Class A common stock (in shares)						105,000
Stock-based compensation	4,911	4,911
Comprehensive loss:
Net loss	(4,810)		(4,810)
Other comprehensive income (loss), net of tax:
Hedging activity	(4,051)			(4,051)
Ending balance at Mar. 31, 2025	1,546,889	1,684,788	(137,795)	(739)		$ 625		$ 10
Ending balance (in shares) at Mar. 31, 2025					62,475,000	62,475,000	988,000	988,000
Beginning balance at Dec. 31, 2025	1,568,709	1,697,143	(125,114)	(3,955)		$ 625		$ 10
Beginning balance (in shares) at Dec. 31, 2025					62,526,000	62,526,000	988,000	988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	(3)	(4)				$ 1
Issuance of Class A common stock (in shares)						96,000
Stock-based compensation	2,866	2,866
Comprehensive loss:
Net loss	(5,539)		(5,539)
Other comprehensive income (loss), net of tax:
Hedging activity	2,259			2,259
Ending balance at Mar. 31, 2026	$ 1,568,292	$ 1,700,005	$ (130,653)	$ (1,696)		$ 626		$ 10
Ending balance (in shares) at Mar. 31, 2026					62,622,000	62,622,000	988,000	988,000

CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands	3 Months Ended	12 Months Ended
CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands	Mar. 31, 2026 USD ($) vote $ / shares shares	Dec. 31, 2025 USD ($) vote $ / shares shares
Accounts receivable - trade, allowance for credit losses \| $	$ 7,340	$ 7,082
Accumulated depreciation and amortization \| $	$ 1,551,756	$ 1,495,563
Class A Common Stock
Common stock, par value (in dollars per share) \| $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	62,622,000	62,526,000
Common stock, shares outstanding (in shares)	62,622,000	62,526,000
Class B Common Stock
Common stock, par value (in dollars per share) \| $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares issued (in shares)	988,000	988,000
Common stock, shares outstanding (in shares)	988,000	988,000
Votes per share held (in votes) \| vote	10	10

DEBT (Tables)

3 Months Ended

Mar. 31, 2026

Debt And Derivatives Disclosure [Abstract]

Schedule of Debt

A summary of debt is as follows:


	March 31, 2026		December 31, 2025
Senior Secured Credit Facility:
Term loan A facility (“Term Loan Facility”) payable quarterly beginning in the fiscal year ended December 31, 2027 with balance due September 2029; bearing interest at 5.218% as of March 31, 2026	$	800,000	$	800,000


Revolving Credit Facility due September 2029; bearing interest at term secured overnight financing rate (“Term SOFR”) plus 1.550%	—		—

Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 (“New York Bonds 2014R-1”) due December 2044 - fixed rate interest period bearing interest at 2.875% through December 2029	25,000		25,000
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 (“New York Bonds 2014R-2”) due December 2044 - fixed rate interest period bearing interest at 3.125% through May 2026	15,000		15,000
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 (“New York Bonds 2020”) due September 2050 - fixed rate interest period bearing interest at 4.250% through September 2030	37,500		37,500
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020R-2 (“New York Bonds 2020R-2”) due September 2050 - fixed rate interest period bearing interest at 5.125% through September 2030	35,000		35,000



Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-3 (“FAME Bonds 2015R-3”) due August 2035 - fixed rate interest period bearing interest at 5.000% through August 2035	29,000		29,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2024 (“FAME Bonds 2024”) due December 2047 - fixed rate interest period bearing interest at 4.625% through May 2035	45,000		45,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 (“Vermont Bonds 2013”) due April 2036 - fixed rate interest period bearing interest at 4.625% through April 2028	16,000		16,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 (“Vermont Bonds 2022A-1”) due June 2052 - fixed rate interest period bearing interest at 5.000% through May 2027	35,000		35,000
Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds Series 2022A-2 (“Vermont Bonds 2022A-2”) due June 2052 - fixed rate interest period bearing interest at 4.375% through May 2032	25,000		25,000
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 (“New Hampshire Bonds”) due April 2029 - fixed rate interest period bearing interest at 2.950% through April 2029	11,000		11,000
Other:
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.708% as of March 31, 2026	89,969		94,035
Notes payable with no stated interest rate maturing through September 2028	1,097		1,097
Principal amount of debt	1,164,566		1,168,632
Less—unamortized debt issuance costs	13,223		13,970
Debt less unamortized debt issuance costs	1,151,343		1,154,662
Less—current maturities of debt	24,588		25,735
	$	1,126,755	$	1,128,927

The Credit Facility shall bear interest, at our election, at Term SOFR or at a base rate, in each case plus or minus any sustainable rate adjustment of up to positive or negative 4.0 basis points per annum, plus an applicable interest rate margin based upon our consolidated net leverage ratio as follows:

Term SOFR Loans

Base Rate Loans

Credit Facility

1.300% to 2.175%

0.300% to 1.175%

Schedule of Cash and Cash Equivalents

Beginning of period and end of period cash, cash equivalents and restricted cash - non-current presented in the consolidated statements of cash flows is reconciled as follows:


	March 31, 2026		December 31, 2025
Cash and cash equivalents	$	126,903	$	123,773
Restricted cash - non-current	—		93,086

Cash, cash equivalents and restricted cash - non-current	$	126,903	$	216,859

Schedule of Restricted Cash

Beginning of period and end of period cash, cash equivalents and restricted cash - non-current presented in the consolidated statements of cash flows is reconciled as follows:


	March 31, 2026		December 31, 2025
Cash and cash equivalents	$	126,903	$	123,773
Restricted cash - non-current	—		93,086

Cash, cash equivalents and restricted cash - non-current	$	126,903	$	216,859

Schedule of Cash Flow Hedges

A summary of the effect of cash flow hedges related to derivative instruments on the consolidated balance sheets follows:


		Fair Value
	Balance Sheet Location	March 31, 2026		December 31, 2025
Interest rate swaps	Other current assets	$	2,133	$	2,081
Interest rate swaps	Other non-current assets	931		835
		$	3,064	$	2,916

Interest rate swaps	Other accrued liabilities	$	2,228	$	3,073
Interest rate swaps	Other long-term liabilities	3,114		5,348
		$	5,342	$	8,421

Interest rate swaps	Accumulated other comprehensive loss, net of tax	$	(2,278)	$	(5,505)
Interest rate swaps - tax effect	Accumulated other comprehensive loss, net of tax	582		1,550
		$	(1,696)	$	(3,955)

GOODWILL AND INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill Activity

A summary of the activity and balances related to goodwill by reportable operating segment is as follows:


	December 31, 2025		Acquisitions		Business Combination Adjustments		March 31, 2026
Eastern	$	110,533	$	—	$	—	$	110,533
Western	371,035		—		573		371,608
Mid-Atlantic	584,136		73,471		—		657,607
Resource Solutions	54,352		—		—		54,352

	$	1,120,056	$	73,471	$	573	$	1,194,100

Schedule of Intangible Assets by Type

Summaries of intangible assets by type follow:


	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, March 31, 2026
Intangible assets	$	74,892	$	427,625	$	26,309	$	528,826
Less accumulated amortization	(45,210)		(191,816)		(19,321)		(256,347)
	$	29,682	$	235,809	$	6,988	$	272,479


	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, December 31, 2025
Intangible assets	$	74,892	$	427,625	$	26,309	$	528,826
Less accumulated amortization	(43,041)		(176,824)		(18,106)		(237,971)
	$	31,851	$	250,801	$	8,203	$	290,855

Schedule of Intangible Amortization Expense Estimated



Estimated Future Intangible Amortization Expense as of March 31, 2026
For the remainder of the fiscal year ending December 31, 2026	$	51,545
Fiscal year ending December 31, 2027	$	61,057
Fiscal year ending December 31, 2028	$	51,960
Fiscal year ending December 31, 2029	$	40,158
Fiscal year ending December 31, 2030	$	28,528
Thereafter	$	39,231

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
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-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 20
-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

+ Details

OTHER ITEMS AND CHARGES	3 Months Ended
OTHER ITEMS AND CHARGES	Mar. 31, 2026
Unusual or Infrequent Items, or Both [Abstract]
OTHER ITEMS AND CHARGES	OTHER ITEMS AND CHARGES Expense from Acquisition Activities In the three months ended March 31, 2026 and March 31, 2025, we recorded charges of $6,509 and $5,529, respectively, comprised primarily of legal, consulting, rebranding, information technology and other costs associated with the due diligence, acquisition and integration of acquired businesses. Organics Facility Closure Charge In the three months ended December 31, 2025, we recorded a charge related to us ceasing operations of an organic residuals composting facility that we own in Maine related to a change in state law prohibiting land application of biosolids based recycled products. In the three months ended March 31, 2026, we recorded $927 of other costs as incurred associated with winding down the facility, and expect to incur additional costs related to ceasing operations at the facility.

ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS (Tables)

3 Months Ended

Mar. 31, 2026

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes to Accrued Capping, Closure and Post-Closure Liabilities

The changes to accrued final capping, closure and post-closure liabilities are as follows:


	Three Months Ended March 31,
	2026		2025
Beginning balance	$	192,722	$	172,230
Obligations incurred	2,938		1,698

Accretion expense	3,951		3,654

Obligations settled (1)	(781)		(755)
Ending balance	$	198,830	$	176,827

(1)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,539)	$ (4,810)
Hedging activity:
Interest rate swap settlements	205	1,008
Interest rate swap amounts reclassified into interest expense	(201)	(1,011)
Unrealized gain (loss) resulting from changes in fair value of derivative instruments	3,224	(5,731)
Other comprehensive income (loss), before tax	3,228	(5,734)
Income tax provision (benefit) related to items of other comprehensive income (loss)	969	(1,683)
Other comprehensive income (loss), net of tax	2,259	(4,051)
Comprehensive loss	$ (3,280)	$ (8,861)

SEGMENT REPORTING (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

Summarized financial information concerning our reportable segments for the three months ended March 31, 2026 and 2025 follows:

Three Months Ended March 31, 2026


	Eastern		Western		Mid-Atlantic		Solid Waste Subtotal		Resource Solutions		Corporate Entities		Eliminations		Consolidated
Third-party revenues	$	111,287	$	162,448	$	94,794	$	368,529	$	88,799	$	—	$	—	$	457,328
Intercompany revenues	27,510		59,992		6,542		94,044		5,798		—		(99,842)		—
Gross revenues	138,797		222,440		101,336		462,573		94,597		—		(99,842)		457,328
Cost of operations	100,901		151,775		76,322		328,998		78,859		912		(99,842)		308,927
General and administration	6,591		8,397		5,959		20,947		5,451		31,730		—		58,128
Depreciation and amortization	17,156		32,457		21,151		70,764		5,196		2,022		—		77,982
Expense from acquisition activities	64		122		1,716		1,902		17		4,590		—		6,509

Organics facility closure charge	—		—		—		—		927		—		—		927

Operating income (loss)	$	14,085	$	29,689	$	(3,812)	$	39,962	$	4,147	$	(39,254)	$	—	4,855
Interest expense, net															13,993
Other income															(314)
Loss before income taxes															$	(8,824)
Interest expense, net	$	384	$	238	$	385	$	1,007	$	22	$	12,964	$	—	$	13,993
Capital expenditures	$	7,675	$	16,078	$	20,903	$	44,656	$	1,716	$	3,607	$	—	$	49,979
Total assets	$	549,868	$	1,117,182	$	1,134,439	$	2,801,489	$	277,422	$	191,538	$	—	$	3,270,449

Three Months Ended March 31, 2025


	Eastern		Western		Mid-Atlantic		Solid Waste Subtotal		Resource Solutions		Corporate Entities		Eliminations		Consolidated
Third-party revenues	$	104,740	$	152,316	$	77,848	$	334,904	$	82,197	$	—	$	—	$	417,101
Intercompany revenues	26,289		53,726		1,813		81,828		3,476		—		(85,304)		—
Gross revenues	131,029		206,042		79,661		416,732		85,673		—		(85,304)		417,101
Cost of operations	95,653		140,412		59,172		295,237		70,032		487		(85,304)		280,452
General and administration	6,053		9,169		4,000		19,222		4,541		32,723		—		56,486
Depreciation and amortization	16,109		30,360		18,261		64,730		5,134		1,627		—		71,491

Expense from acquisition activities	396		844		2,414		3,654		992		883		—		5,529




Operating income (loss)	$	12,818	$	25,257	$	(4,186)	$	33,889	$	4,974	$	(35,720)	$	—	3,143
Interest expense, net															11,598
Other income															(320)
Loss before income taxes															$	(8,135)
Interest expense, net	$	226	$	221	$	55	$	502	$	26	$	11,070	$	—	$	11,598
Capital expenditures	$	8,103	$	15,200	$	25,633	$	48,936	$	4,070	$	2,469	$	—	$	55,475
Total assets	$	538,730	$	1,131,276	$	921,155	$	2,591,161	$	276,983	$	337,726	$	—	$	3,205,870

Schedule of Revenue Attributable to Services

A summary of our revenues attributable to services provided follows:


	Three Months Ended March 31,
	2026		2025
Collection	$	309,652	$	276,461
Disposal (1)	49,511		48,485
Transportation (1)	4,647		5,214
Landfill gas-to-energy	2,935		2,765
Processing	1,784		1,979
Solid waste	368,529		334,904
Processing (2)	43,315		44,516
National Accounts (2)	45,484		37,681
Resource Solutions	88,799		82,197
Total revenues	$	457,328	$	417,101

STOCKHOLDERS' EQUITY - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,568,709	$ 1,550,839
Income tax provision (benefit) related to items of other comprehensive income (loss)	(969)	1,683
Other comprehensive income (loss), net of tax	2,259	(4,051)
Ending balance	1,568,292	$ 1,546,889
Interest Rate Swaps
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,955)
Other comprehensive income before reclassifications	3,429
Interest rate swap amounts reclassified into interest expense	(201)
Income tax provision (benefit) related to items of other comprehensive income (loss)	(969)
Other comprehensive income (loss), net of tax	2,259
Ending balance	$ (1,696)

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false