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      <issuerAddress>
        <com:street1>1720 N FIRST ST</com:street1>
        <com:street2>C/O CALIFORNIA WATER SERVICE CO</com:street2>
        <com:city>SAN JOSE</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>95112</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>4083678200</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Krummel Thomas M</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>THE CHARLES SCHWAB CORPORATION</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>1665</noOfUnitsSold>
      <aggregateMarketValue>84864.00</aggregateMarketValue>
      <noOfUnitsOutstanding>58825117</noOfUnitsOutstanding>
      <approxSaleDate>08/07/2024</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
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      <acquiredDate>11/19/2019</acquiredDate>
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      <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1665</amountOfSecuritiesAcquired>
      <paymentDate>11/19/2019</paymentDate>
      <natureOfPayment>NA</natureOfPayment>
    </securitiesToBeSold>
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        <name>THOMAS KRUMMEL</name>
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          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>95112</com:zipCode>
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      </sellerDetails>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <saleDate>05/15/2024</saleDate>
      <amountOfSecuritiesSold>555</amountOfSecuritiesSold>
      <grossProceeds>29556.00</grossProceeds>
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    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>THOMAS KRUMMEL</name>
        <address>
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          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>95112</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <saleDate>06/05/2024</saleDate>
      <amountOfSecuritiesSold>11</amountOfSecuritiesSold>
      <grossProceeds>550.29</grossProceeds>
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    <securitiesSoldInPast3Months>
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          <com:zipCode>95112</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <saleDate>07/11/2024</saleDate>
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      <grossProceeds>82815.00</grossProceeds>
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      <sellerDetails>
        <name>THOMAS KRUMMEL</name>
        <address>
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          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>95112</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <saleDate>07/17/2024</saleDate>
      <amountOfSecuritiesSold>555</amountOfSecuritiesSold>
      <grossProceeds>29408.67</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>FULL ACCOUNT DETAIL: T KRUMMEL &amp; S KRUMMEL TTEE THOMAS &amp; SUSAN KRUMEL FAM TR</remarks>
    <noticeSignature>
      <noticeDate>08/07/2024</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>06/21/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>THOMAS KRUMMEL</signature>
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144
0001495768
XXXXXXXX
LIVE
0001035201
CALIFORNIA WATER SERVICE GROUP
001-13883
1720 N FIRST ST
C/O CALIFORNIA WATER SERVICE CO
SAN JOSE
CA
95112
4083678200
Krummel Thomas M
Director
COMMON
THE CHARLES SCHWAB CORPORATION
3000 Schwab Way
Westlake
TX
76262
1665
84864.00
58825117
08/07/2024
NYSE
COMMON
11/19/2019
RSU
ISSUER
N
1665
11/19/2019
NA
N
THOMAS KRUMMEL
1720 North First Street
San Jose
CA
95112
COMMON
05/15/2024
555
29556.00
THOMAS KRUMMEL
1720 North First Street
San Jose
CA
95112
COMMON
06/05/2024
11
550.29
THOMAS KRUMMEL
1720 North First Street
San Jose
CA
95112
COMMON
07/11/2024
1654
82815.00
THOMAS KRUMMEL
1720 North First Street
San Jose
CA
95112
COMMON
07/17/2024
555
29408.67
FULL ACCOUNT DETAIL: T KRUMMEL & S KRUMMEL TTEE THOMAS & SUSAN KRUMEL FAM TR
08/07/2024
06/21/2023
THOMAS KRUMMEL