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        <ProgramServicesAmt>41836</ProgramServicesAmt>
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        <Desc>OUTREACH</Desc>
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        <ProgramServicesAmt>15438</ProgramServicesAmt>
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        <Desc>CONTINGENCY</Desc>
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        <EOYAmt>594574</EOYAmt>
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        <EOYAmt>1842585</EOYAmt>
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        <EOYAmt>2437159</EOYAmt>
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      <NetUnrlzdGainsLossesInvstAmt>37682</NetUnrlzdGainsLossesInvstAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
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        <CurrentTaxYearMinus3YearsAmt>940953</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>963190</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearAmt>1065673</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus2YearsAmt>963190</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1067449</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1065673</CurrentTaxYearAmt>
        <TotalAmt>4928858</TotalAmt>
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      <SubstAndDsqlfyPrsnsTotGrp>
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        <CurrentTaxYearMinus1YearAmt>43222</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>76018</CurrentTaxYearAmt>
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      <PublicSupportPY509Pct>0.93190</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.04860</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.04610</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART III, LINE 12, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>MISCELLANEOUS - 2019 AMOUNT: $ 10,562. 2020 AMOUNT: $ 40,193. 2021 AMOUNT: $ 12,039. 2022 AMOUNT: $ 38,432. 2023 AMOUNT: $ 37,513.</ExplanationTxt>
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      <OtherLiabilitiesOrgGrp>
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        <Amt>114</Amt>
      </OtherLiabilitiesOrgGrp>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>WATERISAC IS EXEMPT UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE (THE CODE) FROM THE PAYMENT OF TAXES ON INCOME OTHER THAN UNRELATED BUSINESS INCOME. NO PROVISION FOR INCOME TAX IS REQUIRED FOR THE YEARS ENDED DECEMBER 31, 2023 OR 2022, AS WATERISAC HAD NO NET UNRELATED BUSINESS INCOME. WATERISAC REQUIRES THAT A TAX POSITION BE RECOGNIZED OR DERECOGNIZED BASED ON A "MORE-LIKELY-THAN NOT" THRESHOLD. THIS APPLIES TO POSITIONS TAKEN OR EXPECTED TO BE TAKEN IN A TAX RETURN. WATERISAC DOES NOT BELIEVE ITS FINANCIAL STATEMENTS INCLUDE, OR REFLECT, ANY UNCERTAIN TAX POSITIONS. WATERISAC'S IRS FORM 990, RETURN OF ORGANIZATION EXEMPT FROM INCOME TAX, IS SUBJECT TO EXAMINATION BY TAXING AUTHORITIES GENERALLY FOR THREE YEARS AFTER FILING.</ExplanationTxt>
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      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
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      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>THOMAS DOBBINS</PersonNm>
        <TitleTxt>CHIEF EXECUTIVE OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>3771</OtherCompensationRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>33000</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>35283</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>428283</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BYLAWS HAVE CHANGED IN THE FOLLOWING WAYS: 1) DUES OR SUBSCRIPTION FEES WOULD FORMALLY BE CONSIDERED DELINQUENT ONCE THEY ARE ONE MONTH LATE. AT THAT POINT, THE CEO WOULD PROVIDE NOTIFICATION AND AN OPPORTUNITY FOR THE MEMBER OR SUBSCRIBER TO MAKE PAYMENT IN FULL. IF FULL PAYMENT IS NOT MADE BY THE DATE THAT IS TWO MONTHS AFTER THIS NOTIFICATION OF DELINQUENCY, THE REVISIONS WOULD SPECIFY THAT THE CEO MAY SUSPEND THE MEMBER OR SUBSCRIBER. AUTHORITY TO FULLY TERMINATE A MEMBER FOR GOOD CAUSE WOULD REMAIN WITH THE BOARD, FOLLOWING THE OPPORTUNITY FOR A HEARING. IF THE OWED AMOUNT IS PAID IN FULL, THE CEO WOULD BE REQUIRED TO RESTORE THE ENTITY'S PREVIOUS MEMBERSHIP. 2) A CHANGE TO THE BYLAWS WOULD NOW ONLY REQUIRE A MAJORITY, INSTEAD OF A TWO THIRDS MAJORITY. AS WELL AS A QUORUM AT A MEETING OF 30 PERCENT BE REQUIRED INSTEAD OF 51 PERCENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF MANAGERS DID NOT REVIEW THE FORM 990. HOWEVER, THEY DO APPROVE THE FINANCIAL STATEMENT AUDIT. THE EXECUTIVE DIRECTOR REVIEWED THE FORM 990 BEFORE IT IS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 18</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE DOCUMENTS ARE AVAILABLE UPON WRITTEN REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>PROFESSIONAL FEES: PROGRAM SERVICE EXPENSES 408,144. MANAGEMENT AND GENERAL EXPENSES 16,619. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 424,763.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>REVIEWING THE ANNUAL AUDIT REPORT. THIS PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
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    </IRS990ScheduleO>
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        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>1620 EYE STREEET NW SUITE 500</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20006</ZIPCd>
        </USAddress>
        <EIN>521263300</EIN>
        <PrimaryActivitiesTxt>IMPROVE, ADVANCE &amp; PROTECT DRINKING WATER SUPPLIED BY PUBLIC WATER AGENCIES</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(6)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>N/A</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
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      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
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      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
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</Return>