

<!-- RR Donnelley Xcelerate Taxonomy Schema, based on XBRL 2.1  http://www.rrdonnelley.com/ -->
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<!-- Round: 6 -->
<!-- Creation date: 2012-08-30T08:32:20Z -->
<!-- Copyright (c) 2005-2012 R.R. Donnelley & Sons Company All Rights Reserved. -->
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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 - CONTINGENCIES</link:definition>
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        <link:definition>121 - Disclosure - INVESTMENTS IN UNCONSOLIDATED ENTITIES</link:definition>
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        <link:definition>122 - Disclosure - SUBSIDIARY GUARANTORS</link:definition>
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        <link:definition>125 - Disclosure - ACCRUED CAPPING, CLOSURE AND POST CLOSURE (Tables)</link:definition>
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        <link:definition>126 - Disclosure - STOCK-BASED COMPENSATION (Tables)</link:definition>
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        <link:definition>127 - Disclosure - EARNINGS PER SHARE (Tables)</link:definition>
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        <link:definition>129 - Disclosure - SEGMENT REPORTING (Tables)</link:definition>
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        <link:definition>130 - Disclosure - INVESTMENTS IN UNCONSOLIDATED ENTITIES (Tables)</link:definition>
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        <link:definition>131 - Disclosure - SUBSIDIARY GUARANTORS (Tables)</link:definition>
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        <link:definition>132 - Disclosure - Basis Of Presentation (Narrative) (Detail)</link:definition>
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        <link:definition>133 - Disclosure - Business Acquisitions (Narrative) (Detail)</link:definition>
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        <link:definition>134 - Disclosure - Business Acquisitions (Schedule Of Purchase Price Allocation To Net Assets Acquired) (Detail)</link:definition>
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        <link:definition>140 - 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>144 - Disclosure - Stock-Based Compensation (Summary Of Restricted Stock, Restricted Stock Unit And Performance Stock Unit Activity) (Detail)</link:definition>
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        <link:definition>146 - Disclosure - Earnings Per Share (Schedule Of Numerator And Denominator Used In Computation Of Basic And Diluted Earnings Per Share) (Detail)</link:definition>
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        <link:definition>149 - Disclosure - Fair Value Of Financial Instruments (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Detail)</link:definition>
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  <element name="FairValueAndCarryingValueByBalanceSheetGroupingTable" id="cwst_FairValueAndCarryingValueByBalanceSheetGroupingTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FCRLLCMember" id="cwst_FCRLLCMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancingCosts" id="cwst_FinancingCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" 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="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="InterestRateDerivativesMember" id="cwst_InterestRateDerivativesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateOfNotes" id="cwst_InterestRateOfNotes" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateOfSeniorNotes" id="cwst_InterestRateOfSeniorNotes" type="num:percentItemType" abstract="false" 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="LiabilitiesAssumedAndHoldbacksToSellers" id="cwst_LiabilitiesAssumedAndHoldbacksToSellers" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" 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="MaturityDateOfDebtInstrument" id="cwst_MaturityDateOfDebtInstrument" type="us-types:dateStringItemType" abstract="false" xbrli:periodType="duration" 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="MaximumNumberOfSharesByAwardToBePotentiallyIssuedSubjectToMeetingVestingRequirements" id="cwst_MaximumNumberOfSharesByAwardToBePotentiallyIssuedSubjectToMeetingVestingRequirements" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" 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="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="PaymentsToAcquirePropertyPlantAndEquipmentMaintainence" id="cwst_PaymentsToAcquirePropertyPlantAndEquipmentMaintainence" 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="ProcessingAndOrganicsMember" id="cwst_ProcessingAndOrganicsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PurchaseAndSaleAgreementMember" id="cwst_PurchaseAndSaleAgreementMember" 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="RestrictedStockAndRestrictedStockUnitMember" id="cwst_RestrictedStockAndRestrictedStockUnitMember" 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="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="SecondLienNotesBalance" id="cwst_SecondLienNotesBalance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorRevolvingCreditFacility" id="cwst_SeniorRevolvingCreditFacility" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" 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="SeveranceAndReorganizationCharge" id="cwst_SeveranceAndReorganizationCharge" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" 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="StatementCONSOLIDATEDBALANCESHEETSAbstract" id="cwst_StatementCONSOLIDATEDBALANCESHEETSAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriod" id="cwst_StockIssuedDuringPeriod" 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="SubsidiaryGuarantorsDisclosureTextBlock" id="cwst_SubsidiaryGuarantorsDisclosureTextBlock" type="nonnum:textBlockItemType" abstract="false" 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="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"/>
</schema>





