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      <ProgramServiceRevenueGrp>
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        <BusinessCd>221000</BusinessCd>
        <TotalRevenueColumnAmt>11906</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>11906</RelatedOrExemptFuncIncomeAmt>
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      <TotalProgramServiceRevenueAmt>6404245</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>195539</TotalRevenueColumnAmt>
        <ExclusionAmt>195539</ExclusionAmt>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>5434675</SecuritiesAmt>
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      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>5362945</SecuritiesAmt>
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      <GainOrLossGrp>
        <SecuritiesAmt>71730</SecuritiesAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>71730</TotalRevenueColumnAmt>
        <ExclusionAmt>71730</ExclusionAmt>
      </NetGainOrLossInvestmentsGrp>
      <OtherRevenueMiscGrp>
        <Desc>REIMBURSEMENTS</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>1284908</TotalRevenueColumnAmt>
        <ExclusionAmt>1284908</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>INSURANCE SETTLEMENT</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>211909</TotalRevenueColumnAmt>
        <ExclusionAmt>211909</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>LEASE PROCEEDS-INJECTION WELL</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>12401</TotalRevenueColumnAmt>
        <ExclusionAmt>12401</ExclusionAmt>
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        <TotalRevenueColumnAmt>21491</TotalRevenueColumnAmt>
        <ExclusionAmt>21491</ExclusionAmt>
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        <RelatedOrExemptFuncIncomeAmt>6404245</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>411578</TotalAmt>
        <ProgramServicesAmt>164631</ProgramServicesAmt>
        <ManagementAndGeneralAmt>246947</ManagementAndGeneralAmt>
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        <TotalAmt>2100280</TotalAmt>
        <ProgramServicesAmt>1596680</ProgramServicesAmt>
        <ManagementAndGeneralAmt>503600</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>195050</ProgramServicesAmt>
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      <OtherEmployeeBenefitsGrp>
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        <ProgramServicesAmt>328526</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>2421</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>38045</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>1227</ManagementAndGeneralAmt>
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        <TotalAmt>2738</TotalAmt>
        <ManagementAndGeneralAmt>2738</ManagementAndGeneralAmt>
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        <TotalAmt>357307</TotalAmt>
        <ProgramServicesAmt>206979</ProgramServicesAmt>
        <ManagementAndGeneralAmt>150328</ManagementAndGeneralAmt>
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      <TravelGrp>
        <TotalAmt>80102</TotalAmt>
        <ProgramServicesAmt>73851</ProgramServicesAmt>
        <ManagementAndGeneralAmt>6251</ManagementAndGeneralAmt>
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      <ConferencesMeetingsGrp>
        <TotalAmt>12847</TotalAmt>
        <ManagementAndGeneralAmt>12847</ManagementAndGeneralAmt>
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      <InterestGrp>
        <TotalAmt>12015</TotalAmt>
        <ProgramServicesAmt>12015</ProgramServicesAmt>
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        <TotalAmt>951038</TotalAmt>
        <ProgramServicesAmt>951038</ProgramServicesAmt>
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        <TotalAmt>205318</TotalAmt>
        <ManagementAndGeneralAmt>205318</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>WATER TREATMENT</Desc>
        <TotalAmt>762389</TotalAmt>
        <ProgramServicesAmt>762389</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>ELECTRICITY AND GAS</Desc>
        <TotalAmt>585936</TotalAmt>
        <ProgramServicesAmt>572007</ProgramServicesAmt>
        <ManagementAndGeneralAmt>13929</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>ADMINISTRATIVE EXPENSES</Desc>
        <TotalAmt>94410</TotalAmt>
        <ProgramServicesAmt>15791</ProgramServicesAmt>
        <ManagementAndGeneralAmt>78619</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>SAFETY EQUIPMENT/TOOLS</Desc>
        <TotalAmt>90127</TotalAmt>
        <ProgramServicesAmt>90127</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
        <TotalAmt>87346</TotalAmt>
        <ProgramServicesAmt>9527</ProgramServicesAmt>
        <ManagementAndGeneralAmt>77819</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>5215751</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1643033</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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        <EOYAmt>1305439</EOYAmt>
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        <EOYAmt>1439909</EOYAmt>
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      <AccountsReceivableGrp>
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        <EOYAmt>563403</EOYAmt>
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        <EOYAmt>178952</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>60406121</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>32676424</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>25305904</BOYAmt>
        <EOYAmt>27729697</EOYAmt>
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        <BOYAmt>9471999</BOYAmt>
        <EOYAmt>8146374</EOYAmt>
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        <EOYAmt>280063</EOYAmt>
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        <EOYAmt>707654</EOYAmt>
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        <EOYAmt>300000</EOYAmt>
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        <EOYAmt>513127</EOYAmt>
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        <EOYAmt>1520781</EOYAmt>
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      <CapStkTrPrinCurrentFundsGrp>
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        <EOYAmt>0</EOYAmt>
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      <PdInCapSrplsLandBldgEqpFundGrp>
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        <EOYAmt>0</EOYAmt>
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      <RtnEarnEndowmentIncmOthFndsGrp>
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        <EOYAmt>38123056</EOYAmt>
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        <EOYAmt>38123056</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>39042649</BOYAmt>
        <EOYAmt>39643837</EOYAmt>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>1480762</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>149892</NetUnrlzdGainsLossesInvstAmt>
      <PriorPeriodAdjustmentsAmt>-1060383</PriorPeriodAdjustmentsAmt>
      <OtherChangesInNetAssetsAmt>64700</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <BookValueAmt>453693</BookValueAmt>
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      <BuildingsGrp>
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        <DepreciationAmt>11635517</DepreciationAmt>
        <BookValueAmt>9016374</BookValueAmt>
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      <EquipmentGrp>
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        <DepreciationAmt>21040907</DepreciationAmt>
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      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>27729697</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>POST-RETIREMENT BENEFIT PLAN OBLIGATION</Desc>
        <Amt>175586</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>INJECTION WELL LIABILITY</Desc>
        <Amt>337541</Amt>
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      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>8350888</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>149892</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>149892</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>8200996</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>1227</InvestmentExpensesNotIncldAmt>
      <OtherRevenuesNotIncludedAmt>137323</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>138550</RevenueNotReportedFinclStmtAmt>
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      <TotExpnsEtcAuditedFinclStmtAmt>6857557</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>6857557</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>1227</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>1227</ExpensesNotRptFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ASSOCIATION IS A NONPROFIT ORGANIZATION AND AS SUCH IS NOT SUBJECT TO INCOME TAX. AS OF THE DATE OF THE AUDITED FINANCIAL STATEMENTS REPORT, THE ASSOCIATION HAS NOT UNDERTAKEN ANY ACTIVITIES THAT WOULD POTENTIALLY JEOPARDIZE ITS STATUS AS A NONPROFIT ORGANIZATION. THE CORPORATION FOLLOWS THE INCOME TAX STANDARD FOR UNCERTAIN TAX POSITIONS. AS A RESULT, THE CORPORATION EVALUATED ITS TAX POSITIONS AND DETERMINED IT HAS NO UNCERTAIN TAX POSITIONS AS OF DECEMBER 31, 2023 AND 2022. THE ASSOCIATION INCOME TAX RETURNS ARE SUBJECT TO REVIEW AND EXAMINATION BY FEDERAL AND STATE AUTHORITIES. THE ASSOCIATION IS NOT AWARE OF ANY ACTIVITIES THAT WOULD JEOPARDIZE ITS TAX-EXEMPT STATUS, NOR IS IT AWARE OF ANY ACTIVITIES THAT ARE SUBJECT TO TAX ON UNRELATED BUSINESS INCOME OR EXCISE OR OTHER TAXES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>CONTRIBUTION IN AID OF CONSTRUCTION 137,323.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
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      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>1</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DIANA WILSON</PersonNm>
        <TitleTxt>GENERAL MANAGER</TitleTxt>
        <BaseCompensationFilingOrgAmt>189630</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>15000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>180</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>29465</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>21978</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>256253</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>PATRICK HENRY</PersonNm>
        <TitleTxt>PRODUCTION MANAGER</TitleTxt>
        <BaseCompensationFilingOrgAmt>128958</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>4000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>774</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>19689</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>17326</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>170747</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>INCENTIVE AWARDS ARE BASED ON THE ASSOCIATION'S AND EMPLOYEE'S PERFORMANCE EVALUATION AND ACHIEVEMENT OF GOALS SET DURING THE PREVIOUS YEAR'S REVIEW. TYPICALLY, ONE OF THE LARGER COMPANY-WIDE GOALS IS ACHIEVEMENT OF THE OPERATIONS AND MAINTENANCE EXPENSE BUDGET.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ANY PERSON HAVING REASONABLE ACCESSIBILITY TO THE SOURCE OF AND WHO IS IN NEED OF SERVICES PROVIDED BY THE WATER SYSTEM OR OTHER SERVICES OPERATED BY THE CORPORATION AND WHO RECEIVED THE APPROVAL OF THE BOARD OF DIRECTORS MAY BE ADMITTED TO MEMBERSHIP UPON SUBSCRIBING FOR OR OTHERWISE ACQUIRING A MEMBERSHIP AND BY SIGNING AN APPLICATION FOR MEMBERSHIP AND WATER USER'S AGREEMENT AND UPON FULL PAYMENT OF CHARGES AND CONNECTION FEES ASSOCIATED WITH MEMBERSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>AT THE ANNUAL MEETING OF THE MEMBERS IN APRIL, THE MEMBERS ARE ABLE TO ELECT A DIRECTOR TO ANY OPEN POSITION ON THE BOARD. THIS IS AFTER A NOMINATING COMMITTEE HAS MADE SOME CHOICES, AND THEN SUBMITTED THEM TO THE MEMBERSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>PRIOR TO SUBMITTAL OF THE FEDERAL FORM 990, IT IS PRESENTED TO THE BOARD OF DIRECTORS FOR THEIR REVIEW. AFTER THE REVIEW IS COMPLETE, THE FEDERAL FORM 990 IS SUBMITTED TO THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>MONITORING OF THE CONFLICT OF INTEREST POLICY IS COMPLETED WITH ANNUAL UPDATED RESUMES FROM EXISTING BOARD MEMBERS AND ANY CANDIDATES FOR OPEN POSITIONS. IWA BOARD MEMBERS REVIEW AND SIGN AN ANNUAL CONFLICT OF DISCLOSURE POLICY/STATEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>GENERAL MANAGER PERFORMANCE IN THE MANAGEMENT OF THE COMPANY AND ACHIEVEMENT OF GOALS IS EVALUATED ON AN ANNUAL BASIS BY THE BOARD OF DIRECTORS. INDIVIDUAL DIRECTOR EVALUATIONS ARE BROUGHT TO A PRIVATE MEETING OF THE BOARD FOR DISCUSSION AND DETERMINATION OF THE GM'S ANNUAL MERIT-BASED PAY INCREASE (DECREASE). THE BOARD OF DIRECTORS' DECISIONS REGARDING PERFORMANCE EVALUATION AND MERIT-BASED PAY ARE COMMUNICATED TO THE GENERAL MANAGER BY THE BOARD PRESIDENT. SALARY COMPARISONS FOR OTHER OFFICERS AND KEY PERSONNEL POSITIONS ARE COMPARED TO LOCAL CITY AND UTILITY MARKET COMPENSATION DATA ON AN ANNUAL BASIS. ANNUAL ADJUSTMENTS TO SALARIES ARE MADE BASED ON MARKET DATA AND PERFORMANCE EVALUATION RESULTS. A REVIEW WAS MOST RECENTLY CONDUCTED IN 2023.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ASSOCIATION PROVIDES ACCESS TO THE FINANCIAL STATEMENTS ON THE WEBSITE AT WWW.ISLANDWATER.COM. THE POLICY MANUAL IS LOCATED AT THE OFFICE AND CAN BE REQUESTED BY ANYONE GOING TO THE OFFICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>POST-RETIREMENT BENEFIT CHANGE 64,700.</ExplanationTxt>
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    </IRS990ScheduleO>
  </ReturnData>
</Return>