content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <!-- Generated by Workiva -->
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001055353</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000911177</issuerCik>
        <issuerName>Casella Waste Systems, Inc.</issuerName>
        <secFileNumber>000-23211</secFileNumber>
        <issuerAddress>
          <com:street1>25 Greens Hill Lane</com:street1>
          <com:city>Rutland</com:city>
          <com:stateOrCountry>VT</com:stateOrCountry>
          <com:zipCode>05702</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>802-772-0325</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Douglas R. Casella</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Vice Chairman, BD of Dirctors</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Raymond James &amp; Associates, Inc.</name>
          <address>
            <com:street1>880 Carillon Parkway</com:street1>
            <com:city>St. Petersburg</com:city>
            <com:stateOrCountry>FL</com:stateOrCountry>
            <com:zipCode>33716</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>5303</noOfUnitsSold>
        <aggregateMarketValue>424240</aggregateMarketValue>
        <noOfUnitsOutstanding>57962000</noOfUnitsOutstanding>
        <approxSaleDate>08/08/2023</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/15/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Casella Waste Systems, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1806</amountOfSecuritiesAcquired>
        <paymentDate>03/15/2023</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/14/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Casella Waste Systems, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2467</amountOfSecuritiesAcquired>
        <paymentDate>03/14/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/12/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Casella Waste Systems, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1030</amountOfSecuritiesAcquired>
        <paymentDate>03/12/2021</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>08/08/2023</noticeDate>
        <signature>/s/ Douglas R Casella</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
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text: 144
  0001055353
  XXXXXXXX
  LIVE
  0000911177
  Casella Waste Systems, Inc.
  000-23211
  25 Greens Hill Lane
  Rutland
  VT
  05702
  802-772-0325
  Douglas R. Casella
  Vice Chairman, BD of Dirctors
  Common
  Raymond James & Associates, Inc.
  880 Carillon Parkway
  St. Petersburg
  FL
  33716
  5303
  424240
  57962000
  08/08/2023
  NASDAQ
  Common
  03/15/2023
  Restricted Stock Units
  Casella Waste Systems, Inc.
  N
  1806
  03/15/2023
  Cash
  Common
  03/14/2022
  Restricted Stock Units
  Casella Waste Systems, Inc.
  N
  2467
  03/14/2022
  Cash
  Common
  03/12/2021
  Restricted Stock Units
  Casella Waste Systems, Inc.
  N
  1030
  03/12/2021
  Cash
  Y
  08/08/2023
  /s/ Douglas R Casella