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        <link:definition>1030 - Disclosure - Quarterly Financial Information</link:definition>
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        <link:definition>1049 - Disclosure - Quarterly Financial Information (Tables)</link:definition>
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        <link:definition>1103 - Disclosure - Divestiture Transactions and Discontinued Operations - Schedule of Revenues and Loss Before Income Taxes Attributable to Discontinued Operations (Detail)</link:definition>
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        <link:definition>1108 - Disclosure - Segment Reporting - Summary of Revenue Attributable to Services Provided by Company (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>1112 - Disclosure - Subsidiary Guarantors - Schedule of Consolidating Statement of Comprehensive Income (Loss) (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>1113 - Disclosure - Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail)</link:definition>
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  <element name="IncomeLossFromOperationsBeforeProvisionBenefitForIncomeTaxesLineItems" id="cwst_IncomeLossFromOperationsBeforeProvisionBenefitForIncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeLossFromOperationsBeforeProvisionBenefitForIncomeTaxesTable" id="cwst_IncomeLossFromOperationsBeforeProvisionBenefitForIncomeTaxesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="IncomeTaxesLineItems" id="cwst_IncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxesTable" id="cwst_IncomeTaxesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="IncomeTaxSettlement" id="cwst_IncomeTaxSettlement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxSettlementInterestPaid" id="cwst_IncomeTaxSettlementInterestPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxSettlementTaxPaid" id="cwst_IncomeTaxSettlementTaxPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InflationRate" id="cwst_InflationRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InitialTermOfExecutiveEmploymentAgreement" id="cwst_InitialTermOfExecutiveEmploymentAgreement" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" 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="InvestmentInSubsidiaries" id="cwst_InvestmentInSubsidiaries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LandfillOperatingLeaseMember" id="cwst_LandfillOperatingLeaseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LegalRelatedCostsMember" id="cwst_LegalRelatedCostsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LettersOfCreditFees" id="cwst_LettersOfCreditFees" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LineOfCreditFacilityOption" id="cwst_LineOfCreditFacilityOption" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySixMember" id="cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNineMember" id="cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNineMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaineBondsMember" id="cwst_MaineBondsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaineEnergyFacilityMember" id="cwst_MaineEnergyFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumDebtToEbitdaRatio" id="cwst_MaximumDebtToEbitdaRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumPotentialSharesIssuedUnderPlan" id="cwst_MaximumPotentialSharesIssuedUnderPlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumSeniorFundedDebtToAdjustedEbitdaRatio" id="cwst_MaximumSeniorFundedDebtToAdjustedEbitdaRatio" type="xbrli:pureItemType" 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="NewHampshireBondsMember" id="cwst_NewHampshireBondsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonEmployeeDirectorsStockOptionPlanMember" id="cwst_NonEmployeeDirectorsStockOptionPlanMember" 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="NumberOfLandfillsOwnedAndOperatedByCompany" id="cwst_NumberOfLandfillsOwnedAndOperatedByCompany" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfLeases" id="cwst_NumberOfLeases" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumeratorAbstract" id="cwst_NumeratorAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLeaseObligationMember" id="cwst_OperatingLeaseObligationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardsExpirationDateDescription" id="cwst_OperatingLossCarryforwardsExpirationDateDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OrganicsMember" id="cwst_OrganicsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OriginalDebtDiscountMember" id="cwst_OriginalDebtDiscountMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OthersMember" id="cwst_OthersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherValuationAllowanceMember" id="cwst_OtherValuationAllowanceMember" type="nonnum:domainItemType" abstract="true" 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="PercentageOfNetCashProceeds" id="cwst_PercentageOfNetCashProceeds" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPotentialCumulativeLiability" id="cwst_PercentageOfPotentialCumulativeLiability" type="num:percentItemType" abstract="false" xbrli:periodType="duration" 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="PeriodOverWhichConsiderationForSaleOfDisposalGroupAssetsToBeReceived" id="cwst_PeriodOverWhichConsiderationForSaleOfDisposalGroupAssetsToBeReceived" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PotsdamEnvironmentalLiabilityMember" id="cwst_PotsdamEnvironmentalLiabilityMember" 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="ProcessingMember" id="cwst_ProcessingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PropertyPlantAndEquipmentUsefulLifeAndValuesAbstract" id="cwst_PropertyPlantAndEquipmentUsefulLifeAndValuesAbstract" type="xbrli:stringItemType" 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="RegulatoryAssetsAbstract" id="cwst_RegulatoryAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RelatedPartyMember" id="cwst_RelatedPartyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Reserve" id="cwst_Reserve" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedCashAndInvestmentsLineItems" id="cwst_RestrictedCashAndInvestmentsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedCashAndInvestmentsTable" id="cwst_RestrictedCashAndInvestmentsTable" 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="RestrictedStockAwardsMember" id="cwst_RestrictedStockAwardsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedStockRestrictedStockUnitsAndPerformanceStockUnitsMember" id="cwst_RestrictedStockRestrictedStockUnitsAndPerformanceStockUnitsMember" 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="RollingStockMember" id="cwst_RollingStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfAssetRetirementObligationTable" id="cwst_ScheduleOfAssetRetirementObligationTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfEstimatedUsefulLivesOfPropertyPlantAndEquipmentTableTextBlock" id="cwst_ScheduleOfEstimatedUsefulLivesOfPropertyPlantAndEquipmentTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfFutureEnvironmentalRemediationPaymentsTableTextBlock" id="cwst_ScheduleOfFutureEnvironmentalRemediationPaymentsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfReconciliationOfExpectedUndiscountedLiabilityToActualLiabilityTableTextBlock" id="cwst_ScheduleOfReconciliationOfExpectedUndiscountedLiabilityToActualLiabilityTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityLineItems" id="cwst_ScheduleOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityTable" id="cwst_ScheduleOfRestrictedStockRestrictedStockUnitAndPerformanceStockUnitActivityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfStockOptionActivityLineItems" id="cwst_ScheduleOfStockOptionActivityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfStockOptionActivityTable" id="cwst_ScheduleOfStockOptionActivityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScrapYardAndSolidWasteTransferStation" id="cwst_ScrapYardAndSolidWasteTransferStation" type="num:areaItemType" abstract="false" xbrli:periodType="instant" 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="SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember" id="cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorSecuredRevolvingCreditFacilityMember" id="cwst_SeniorSecuredRevolvingCreditFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" 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="SeniorSubordinatedNotesDueTwoThousandThirteenMember" id="cwst_SeniorSubordinatedNotesDueTwoThousandThirteenMember" 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="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestAggregateIntrinsicValue" id="cwst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestAggregateIntrinsicValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber" id="cwst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue" id="cwst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageRemainingContractualTerms" id="cwst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageRemainingContractualTerms" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SignificantLegalSettlementMember" id="cwst_SignificantLegalSettlementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" 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="SouthbridgeLandfillMember" id="cwst_SouthbridgeLandfillMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockholdersEquityExcludingPortionAttributableToSubsidiariesNoncontrollingInterestAbstract" id="cwst_StockholdersEquityExcludingPortionAttributableToSubsidiariesNoncontrollingInterestAbstract" type="xbrli:stringItemType" 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="SummaryOfSignificantAccountingPoliciesLineItems" id="cwst_SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SummaryOfSignificantAccountingPoliciesTable" id="cwst_SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SuretyBonds" id="cwst_SuretyBonds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TenderPremiumAndTenderFeesMember" id="cwst_TenderPremiumAndTenderFeesMember" 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="TompkinsMember" id="cwst_TompkinsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandAndNineteenMember" id="cwst_TwoThousandAndNineteenMember" 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="TwoThousandNineteenNotesMember" id="cwst_TwoThousandNineteenNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandSixStockIncentivePlanMember" id="cwst_TwoThousandSixStockIncentivePlanMember" 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="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VariableRateBondsMember" id="cwst_VariableRateBondsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VermontBondsMember" id="cwst_VermontBondsMember" type="nonnum:domainItemType" abstract="true" 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="WeightedAverageNumberOfCommonSharesOutstandingAbstract" id="cwst_WeightedAverageNumberOfCommonSharesOutstandingAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WesternMember" id="cwst_WesternMember" 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="WorkersCompensationBenefits" id="cwst_WorkersCompensationBenefits" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WriteOffDeferredFinancingCostsMember" id="cwst_WriteOffDeferredFinancingCostsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WriteOffUnamortizedOriginalIssueDiscountMember" id="cwst_WriteOffUnamortizedOriginalIssueDiscountMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>





