

<!-- RR Donnelley Xcelerate Taxonomy Schema, based on XBRL 2.1  http://www.rrdonnelley.com/ -->
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<!-- Round: 454c7267-ae20-49a4-b364-11def23cba1b -->
<!-- Creation date: 2013-03-05T03:19:30Z -->
<!-- Copyright (c) 2005-2013 R.R. Donnelley & Sons Company All Rights Reserved. -->
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        <link:definition>103 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
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        <link:definition>109 - Statement - CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY</link:definition>
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        <link:definition>110 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
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        <link:definition>111 - Disclosure - BASIS OF PRESENTATION</link:definition>
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        <link:definition>112 - Disclosure - BUSINESS ACQUISITIONS</link:definition>
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        <link:definition>113 - Disclosure - GOODWILL AND INTANGIBLE ASSETS</link:definition>
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        <link:definition>114 - Disclosure - ACCRUED CAPPING, CLOSURE AND POST CLOSURE</link:definition>
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        <link:definition>115 - Disclosure - LONG-TERM DEBT AND CAPITAL LEASES</link:definition>
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        <link:definition>116 - Disclosure - CONTINGENCIES</link:definition>
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        <link:definition>117 - Disclosure - STOCKHOLDERS' EQUITY</link:definition>
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        <link:definition>118 - Disclosure - EARNINGS PER SHARE</link:definition>
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        <link:definition>121 - Disclosure - DEVELOPMENT PROJECT CHARGE</link:definition>
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        <link:definition>122 - Disclosure - SEVERANCE AND REORGANIZATION</link:definition>
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        <link:definition>123 - Disclosure - DIVESTITURE AND DISCONTINUED OPERATIONS</link:definition>
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        <link:definition>124 - Disclosure - SEGMENT REPORTING</link:definition>
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        <link:definition>125 - Disclosure - INVESTMENTS IN UNCONSOLIDATED ENTITIES</link:definition>
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        <link:definition>126 - Disclosure - SUBSIDIARY GUARANTORS</link:definition>
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        <link:definition>127 - Disclosure - BUSINESS ACQUISITIONS (Tables)</link:definition>
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        <link:definition>128 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables)</link:definition>
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        <link:definition>129 - Disclosure - ACCRUED CAPPING, CLOSURE AND POST CLOSURE (Tables)</link:definition>
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        <link:definition>130 - Disclosure - LONG-TERM DEBT AND CAPITAL LEASES (Tables)</link:definition>
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        <link:definition>131 - Disclosure - STOCKHOLDERS' EQUITY (Tables)</link:definition>
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        <link:definition>132 - Disclosure - EARNINGS PER SHARE (Tables)</link:definition>
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        <link:definition>133 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</link:definition>
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        <link:definition>134 - Disclosure - SEGMENT REPORTING (Tables)</link:definition>
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        <link:definition>135 - Disclosure - INVESTMENTS IN UNCONSOLIDATED ENTITIES (Tables)</link:definition>
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        <link:definition>136 - Disclosure - SUBSIDIARY GUARANTORS (Tables)</link:definition>
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        <link:definition>137 - Disclosure - Business Acquisitions (Narrative) (Detail)</link:definition>
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        <link:definition>138 - Disclosure - Business Acquisitions (Schedule of Purchase Price Allocation to Net Assets Acquired) (Detail)</link:definition>
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        <link:definition>139 - Disclosure - Business Acquisitions (Schedule of Unaudited Proforma Combined Financial Information) (Detail)</link:definition>
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        <link:definition>140 - Disclosure - Goodwill And Intangible Assets (Schedule of Activity and Balance Related to Goodwill) (Detail)</link:definition>
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        <link:definition>141 - Disclosure - Goodwill And Intangible Assets (Components of Intangible Assets) (Detail)</link:definition>
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        <link:definition>142 - Disclosure - Goodwill And Intangible Assets (Narrative) (Detail)</link:definition>
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        <link:definition>143 - Disclosure - Goodwill And Intangible Assets (Estimated of Amortization Expenses) (Detail)</link:definition>
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        <link:definition>144 - Disclosure - Accrued Capping, Closure And Post Closure (Changes to Accrued Capping, Closure and Post-Closure Liabilities) (Detail)</link:definition>
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        <link:definition>145 - Disclosure - Long-Term Debt and Capital Leases (Narrative) (Detail)</link:definition>
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        <link:definition>146 - Disclosure - Long-Term Debt and Capital Leases (Components of Long Term Debt and Capital Leases) (Detail)</link:definition>
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        <link:definition>147 - Disclosure - Long-Term Debt and Capital Leases (Components of Long Term Debt and Capital Leases) (Parenthetical) (Detail)</link:definition>
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        <link:definition>149 - Disclosure - Stockholders' Equity (Narrative) (Detail)</link:definition>
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        <link:definition>150 - Disclosure - Stockholders' Equity (Summary of Stock Option Activity) (Detail)</link:definition>
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  <element name="DisclosureGoodwillAndIntangibleAssetsNarrativeAbstract" id="cwst_DisclosureGoodwillAndIntangibleAssetsNarrativeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureGoodwillAndIntangibleAssetsScheduleOfActivityAndBalanceRelatedToGoodwillAbstract" id="cwst_DisclosureGoodwillAndIntangibleAssetsScheduleOfActivityAndBalanceRelatedToGoodwillAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIncomeTaxesNarrativeAbstract" id="cwst_DisclosureIncomeTaxesNarrativeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureInvestmentsInUnconsolidatedEntitiesNarrativeAbstract" id="cwst_DisclosureInvestmentsInUnconsolidatedEntitiesNarrativeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureInvestmentsInUnconsolidatedEntitiesSummarizedBalanceSheetFinancialInformationOfInvestmentsInUnconsolidatedAffiliatesAbstract" id="cwst_DisclosureInvestmentsInUnconsolidatedEntitiesSummarizedBalanceSheetFinancialInformationOfInvestmentsInUnconsolidatedAffiliatesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureInvestmentsInUnconsolidatedEntitiesSummarizedIncomeStatementFinancialInformationOfInvestmentsInUnconsolidatedAffiliatesAbstract" id="cwst_DisclosureInvestmentsInUnconsolidatedEntitiesSummarizedIncomeStatementFinancialInformationOfInvestmentsInUnconsolidatedAffiliatesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureLongTermDebtAndCapitalLeasesComponentsOfLongTermDebtAndCapitalLeasesAbstract" id="cwst_DisclosureLongTermDebtAndCapitalLeasesComponentsOfLongTermDebtAndCapitalLeasesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureLongTermDebtAndCapitalLeasesNarrativeAbstract" id="cwst_DisclosureLongTermDebtAndCapitalLeasesNarrativeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSegmentReportingSummaryOfFinancialInformationByReportableSegmentAbstract" id="cwst_DisclosureSegmentReportingSummaryOfFinancialInformationByReportableSegmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSegmentReportingSummaryOfRevenueAttributableToServicesProvidedByCompanyAbstract" id="cwst_DisclosureSegmentReportingSummaryOfRevenueAttributableToServicesProvidedByCompanyAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSeveranceAndReorganizationNarrativeAbstract" id="cwst_DisclosureSeveranceAndReorganizationNarrativeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureStockholdersEquityNarrativeAbstract" id="cwst_DisclosureStockholdersEquityNarrativeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureStockholdersEquityScheduleOfFairValuesOfStockOptionsRelatedToSharesIssuedUnderEmployeeStockPurchasePlanAbstract" id="cwst_DisclosureStockholdersEquityScheduleOfFairValuesOfStockOptionsRelatedToSharesIssuedUnderEmployeeStockPurchasePlanAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureStockholdersEquitySummaryOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityAbstract" id="cwst_DisclosureStockholdersEquitySummaryOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureStockholdersEquitySummaryOfStockOptionActivityAbstract" id="cwst_DisclosureStockholdersEquitySummaryOfStockOptionActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSubsidiaryGuarantorsScheduleOfCondensedConsolidatingBalanceSheetAbstract" id="cwst_DisclosureSubsidiaryGuarantorsScheduleOfCondensedConsolidatingBalanceSheetAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSubsidiaryGuarantorsScheduleOfCondensedConsolidatingStatementsOfCashFlowsAbstract" id="cwst_DisclosureSubsidiaryGuarantorsScheduleOfCondensedConsolidatingStatementsOfCashFlowsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSubsidiaryGuarantorsScheduleOfConsolidatingStatementsOfComprehensiveLossAbstract" id="cwst_DisclosureSubsidiaryGuarantorsScheduleOfConsolidatingStatementsOfComprehensiveLossAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSubsidiaryGuarantorsScheduleOfConsolidatingStatementsOfOperationsAbstract" id="cwst_DisclosureSubsidiaryGuarantorsScheduleOfConsolidatingStatementsOfOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisposalGroupIncludingDiscontinuedOperationNumberOfUnitsRetained" id="cwst_DisposalGroupIncludingDiscontinuedOperationNumberOfUnitsRetained" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisposalGroupIncludingDiscontinuedOperationsNumberOfDisposedUnits" id="cwst_DisposalGroupIncludingDiscontinuedOperationsNumberOfDisposedUnits" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisposalMember" id="cwst_DisposalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DivestitureAcquisitionFinancingCosts" id="cwst_DivestitureAcquisitionFinancingCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DivestituresLineItems" id="cwst_DivestituresLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DivestituresTable" id="cwst_DivestituresTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="DocumentDocumentAndEntityInformationAbstract" id="cwst_DocumentDocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EarningsPerShareLineItems" id="cwst_EarningsPerShareLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EarningsPerShareTable" id="cwst_EarningsPerShareTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="EasternRegionMember" id="cwst_EasternRegionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EliminationMember" id="cwst_EliminationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmployeeStockPurchasePlanMember" id="cwst_EmployeeStockPurchasePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentSummarizedFinancialInformationBalanceSheetTableTextBlock" id="cwst_EquityMethodInvestmentSummarizedFinancialInformationBalanceSheetTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentSummarizedFinancialInformationGrossRevenue" id="cwst_EquityMethodInvestmentSummarizedFinancialInformationGrossRevenue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EvergreenNationalIndemnityCompanyMember" id="cwst_EvergreenNationalIndemnityCompanyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAndCarryingValueByBalanceSheetGroupingLineItems" id="cwst_FairValueAndCarryingValueByBalanceSheetGroupingLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAndCarryingValueByBalanceSheetGroupingTable" id="cwst_FairValueAndCarryingValueByBalanceSheetGroupingTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems" id="cwst_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable" id="cwst_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FameBondsFixed" id="cwst_FameBondsFixed" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FameBondsVariable" id="cwst_FameBondsVariable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FcrllcMember" id="cwst_FcrllcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancingLeaseObligationCurrent" id="cwst_FinancingLeaseObligationCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancingLeaseObligationNoncurrent" id="cwst_FinancingLeaseObligationNoncurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FixedRateLongTermDebtFairValue" id="cwst_FixedRateLongTermDebtFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FutureRemediationCosts" id="cwst_FutureRemediationCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare" id="cwst_GainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainLossRelatedToLitigationSettlements" id="cwst_GainLossRelatedToLitigationSettlements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GreenerUIncMember" id="cwst_GreenerUIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GreenFiberMember" id="cwst_GreenFiberMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GrossProceedsFromTransaction" id="cwst_GrossProceedsFromTransaction" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInPrepaidDeferredExpenseInventoryAndOtherAssets" id="cwst_IncreaseDecreaseInPrepaidDeferredExpenseInventoryAndOtherAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntercompanyBorrowings" id="cwst_IntercompanyBorrowings" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntercompanyReceivable" id="cwst_IntercompanyReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestCoverageMinimumRatio" id="cwst_InterestCoverageMinimumRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateDerivativesMember" id="cwst_InterestRateDerivativesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentInSubsidiaries" id="cwst_InvestmentInSubsidiaries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LetterOfCreditInterestPercentage" id="cwst_LetterOfCreditInterestPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LineOfCreditBorrowingCapacity" id="cwst_LineOfCreditBorrowingCapacity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LineOfCreditFacilityMaximumRefinancingBorrowings" id="cwst_LineOfCreditFacilityMaximumRefinancingBorrowings" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent" id="cwst_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LossOnTenderOffer" id="cwst_LossOnTenderOffer" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MajorAccountsMember" id="cwst_MajorAccountsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaterialRecoveryFacilitiesNumber" id="cwst_MaterialRecoveryFacilitiesNumber" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumDebtToEbitdaxRatio" id="cwst_MaximumDebtToEbitdaxRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumExercisePeriodOfStockOptions" id="cwst_MaximumExercisePeriodOfStockOptions" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumFundedDebtToAdjustedEbitdaRatio" id="cwst_MaximumFundedDebtToAdjustedEbitdaRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumNumberOfDaysToEstablishPlansToMonitorComplianceWithConsentOrder" id="cwst_MaximumNumberOfDaysToEstablishPlansToMonitorComplianceWithConsentOrder" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumNumberOfSharesByAwardToBePotentiallyIssuedSubjectToMeetingVestingRequirements" id="cwst_MaximumNumberOfSharesByAwardToBePotentiallyIssuedSubjectToMeetingVestingRequirements" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MinorityInterestIncreaseFromContributions" id="cwst_MinorityInterestIncreaseFromContributions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MotorsLiquidationTrustMember" id="cwst_MotorsLiquidationTrustMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NotesPayableMember" id="cwst_NotesPayableMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherSegmentMember" id="cwst_OtherSegmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OwnershipPercentageCostMethodInvestment" id="cwst_OwnershipPercentageCostMethodInvestment" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentPeriod" id="cwst_PaymentPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsForCapitalExpenditureOnDivestitureOfBusiness" id="cwst_PaymentsForCapitalExpenditureOnDivestitureOfBusiness" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsForLandfillOperatingLease" id="cwst_PaymentsForLandfillOperatingLease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsToAcquirePropertyPlantAndEquipmentAcquisition" id="cwst_PaymentsToAcquirePropertyPlantAndEquipmentAcquisition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsToAcquirePropertyPlantAndEquipmentGrowth" id="cwst_PaymentsToAcquirePropertyPlantAndEquipmentGrowth" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsToAcquirePropertyPlantAndEquipmentMaintenance" id="cwst_PaymentsToAcquirePropertyPlantAndEquipmentMaintenance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCommoditiesMarketByPurchaser" id="cwst_PercentageOfCommoditiesMarketByPurchaser" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOrAdditionalPercentageOfEstimatedRemediationCosts" id="cwst_PercentageOrAdditionalPercentageOfEstimatedRemediationCosts" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PerformanceShareUnitsMember" id="cwst_PerformanceShareUnitsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PerformanceStockUnitMember" id="cwst_PerformanceStockUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PowerGenerationMember" id="cwst_PowerGenerationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PresentCostsPreferredRemedies" id="cwst_PresentCostsPreferredRemedies" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalAmountsOfSeniorNotesRepurchased" id="cwst_PrincipalAmountsOfSeniorNotesRepurchased" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProcessingAndOrganicsMember" id="cwst_ProcessingAndOrganicsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RecycleRewardsIncMember" id="cwst_RecycleRewardsIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RecyclingMember" id="cwst_RecyclingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReorganizationItemsLineItems" id="cwst_ReorganizationItemsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReorganizationItemsTable" id="cwst_ReorganizationItemsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="RestrictedStockAndRestrictedStockUnitMember" id="cwst_RestrictedStockAndRestrictedStockUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevenueBondsSeriesTwoThousandFiveROneDueTwoThousandTwentyFiveMember" id="cwst_RevenueBondsSeriesTwoThousandFiveROneDueTwoThousandTwentyFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevenueBondsSeriesTwoThousandFiveRTwoDueTwoThousandTwentyFiveMember" id="cwst_RevenueBondsSeriesTwoThousandFiveRTwoDueTwoThousandTwentyFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SaleConsiderationOfBusiness" id="cwst_SaleConsiderationOfBusiness" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCondensedComprehensiveIncomeLossTableTextBlock" id="cwst_ScheduleOfCondensedComprehensiveIncomeLossTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfConsolidatingIncomeStatementTableTextBlock" id="cwst_ScheduleOfConsolidatingIncomeStatementTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfEquityMethodInvestmentSummarizedFinancialInformationTableTextBlock" id="cwst_ScheduleOfEquityMethodInvestmentSummarizedFinancialInformationTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScrapYardAndSolidWasteTransferStation" id="cwst_ScrapYardAndSolidWasteTransferStation" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SecondLienNoteMember" id="cwst_SecondLienNoteMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SecondLienNotesMember" id="cwst_SecondLienNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorCreditFacilityMember" id="cwst_SeniorCreditFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorNotesOutstanding" id="cwst_SeniorNotesOutstanding" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember" id="cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorSecuredSecondLienNotesDueTwoThousandFourteenMember" id="cwst_SeniorSecuredSecondLienNotesDueTwoThousandFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorSubordinatedNotesAndConvertedBonds" id="cwst_SeniorSubordinatedNotesAndConvertedBonds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorSubordinatedNotesDueTwoThousandNineteenMember" id="cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeveranceAndReorganizationLiability" id="cwst_SeveranceAndReorganizationLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTargetPerformanceRate" id="cwst_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTargetPerformanceRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SolidWasteOperationsMember" id="cwst_SolidWasteOperationsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesAcquisitionsAndForServices" id="cwst_StockIssuedDuringPeriodSharesAcquisitionsAndForServices" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodValueAcquisitionAndForServices" id="cwst_StockIssuedDuringPeriodValueAcquisitionAndForServices" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionsPerformanceStockUnitsRestrictedStockUnitsAndRestrictedStockMember" id="cwst_StockOptionsPerformanceStockUnitsRestrictedStockUnitsAndRestrictedStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TompkinsCountyRecyclingLlcMember" id="cwst_TompkinsCountyRecyclingLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandElevenRevolvingCreditFacilityMember" id="cwst_TwoThousandElevenRevolvingCreditFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UndiscountedCostsPreferredRemedies" id="cwst_UndiscountedCostsPreferredRemedies" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnrecognizedShareBasedCompensationRestrictedStockAndUnitExpenseWeightedAverageAmortizationPeriodRemainingYears" id="cwst_UnrecognizedShareBasedCompensationRestrictedStockAndUnitExpenseWeightedAverageAmortizationPeriodRemainingYears" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnrecognizedStockBasedCompensationExpense" id="cwst_UnrecognizedStockBasedCompensationExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnvestedRestrictedStockAwards" id="cwst_UnvestedRestrictedStockAwards" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WasteStreamIncMember" id="cwst_WasteStreamIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WesternRegionMember" id="cwst_WesternRegionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WorkingCapitalAdjustment" id="cwst_WorkingCapitalAdjustment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WriteOffDebtDiscount" id="cwst_WriteOffDebtDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
</schema>





