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        <link:definition>0010 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/StatementOfIncome" id="StatementOfIncome">
        <link:definition>0020 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureBasisOfPresentation" id="DisclosureBasisOfPresentation">
        <link:definition>1010 - Disclosure - BASIS OF PRESENTATION</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureReclassification" id="DisclosureReclassification">
        <link:definition>8000 - Disclosure - RECLASSIFICATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureGoodwillAndIntangibleAssets" id="DisclosureGoodwillAndIntangibleAssets">
        <link:definition>1030 - Disclosure - GOODWILL AND INTANGIBLE ASSETS</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureLongTermDebt" id="DisclosureLongTermDebt">
        <link:definition>8010 - Disclosure - LONG-TERM DEBT</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>1050 - Disclosure - CONTINGENCIES</link:definition>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureStockBasedCompensation" id="DisclosureStockBasedCompensation">
        <link:definition>1060 - Disclosure - STOCK-BASED COMPENSATION</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureEarningsPerShare" id="DisclosureEarningsPerShare">
        <link:definition>1070 - Disclosure - EARNINGS PER SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.casella.com/role/DisclosureComprehensiveLoss" id="DisclosureComprehensiveLoss">
        <link:definition>1080 - Disclosure - COMPREHENSIVE LOSS</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.casella.com/role/DisclosureFairValueOfFinancialInstruments" id="DisclosureFairValueOfFinancialInstruments">
        <link:definition>1090 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureAssetsHeldForSaleAndDiscontinuedOperations" id="DisclosureAssetsHeldForSaleAndDiscontinuedOperations">
        <link:definition>1100 - Disclosure - ASSETS HELD FOR SALE AND DISCONTINUED OPERATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureSegmentReporting" id="DisclosureSegmentReporting">
        <link:definition>1120 - Disclosure - SEGMENT REPORTING</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureInvestmentsInUnconsolidatedEntities" id="DisclosureInvestmentsInUnconsolidatedEntities">
        <link:definition>1130 - Disclosure - INVESTMENTS IN UNCONSOLIDATED ENTITIES</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureSubsidiaryGuarantors" id="DisclosureSubsidiaryGuarantors">
        <link:definition>1140 - Disclosure - SUBSIDIARY GUARANTORS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/CashFlows" id="CashFlows">
        <link:definition>0030 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DocumentAndEntityInformation" id="DocumentAndEntityInformation">
        <link:definition>9999 - Document - Document and Entity Information</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/BalanceSheetParenthetical" id="BalanceSheetParenthetical">
        <link:definition>0015 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/StatementOfIncomeParenthetical" id="StatementOfIncomeParenthetical">
        <link:definition>0025 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureAccruedCappingClosureAndPostClosure" id="DisclosureAccruedCappingClosureAndPostClosure">
        <link:definition>1040 - Disclosure - ACCRUED CAPPING, CLOSURE AND POST CLOSURE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.casella.com/role/DisclosureBusinessAcquisitions" id="DisclosureBusinessAcquisitions">
        <link:definition>1020 - Disclosure - BUSINESS ACQUISITIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.casella.com/role/DisclosureRelatedPartyTransaction" id="DisclosureRelatedPartyTransaction">
        <link:definition>1110 - Disclosure - RELATED PARTY TRANSACTION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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  <xsd:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xsd:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.xsd"/>
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  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
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  <xsd:element name="InterestAccretionOnLandfillAndEnvironmentalRemediationLiabilities" id="cwst_InterestAccretionOnLandfillAndEnvironmentalRemediationLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration"/>
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