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      <OtherRevenueTotalAmt>40933</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>1156579</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1108382</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>48197</ExclusionAmt>
      </TotalRevenueGrp>
      <FeesForServicesManagementGrp>
        <TotalAmt>485622</TotalAmt>
        <ProgramServicesAmt>325366</ProgramServicesAmt>
        <ManagementAndGeneralAmt>160256</ManagementAndGeneralAmt>
      </FeesForServicesManagementGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>5101</TotalAmt>
        <ProgramServicesAmt>3215</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1886</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>37825</TotalAmt>
        <ManagementAndGeneralAmt>37825</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>10479</TotalAmt>
        <ManagementAndGeneralAmt>10479</ManagementAndGeneralAmt>
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      <FeesForServicesOtherGrp>
        <TotalAmt>24312</TotalAmt>
        <ProgramServicesAmt>15324</ProgramServicesAmt>
        <ManagementAndGeneralAmt>8988</ManagementAndGeneralAmt>
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      <OfficeExpensesGrp>
        <TotalAmt>22371</TotalAmt>
        <ProgramServicesAmt>22371</ProgramServicesAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>21995</TotalAmt>
        <ProgramServicesAmt>21995</ProgramServicesAmt>
      </InformationTechnologyGrp>
      <TravelGrp>
        <TotalAmt>13039</TotalAmt>
        <ProgramServicesAmt>8218</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4821</ManagementAndGeneralAmt>
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      <DepreciationDepletionGrp>
        <TotalAmt>33403</TotalAmt>
        <ProgramServicesAmt>33403</ProgramServicesAmt>
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      <InsuranceGrp>
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        <ProgramServicesAmt>2692</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1579</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>SERVICE CONTRACT</Desc>
        <TotalAmt>319378</TotalAmt>
        <ProgramServicesAmt>319378</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>DATABASE ACCESS</Desc>
        <TotalAmt>51621</TotalAmt>
        <ProgramServicesAmt>51621</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>PORTAL MAINTENANCE</Desc>
        <TotalAmt>38870</TotalAmt>
        <ProgramServicesAmt>38870</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>OUTREACH</Desc>
        <TotalAmt>22970</TotalAmt>
        <ProgramServicesAmt>22970</ProgramServicesAmt>
      </OtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>1091257</TotalAmt>
        <ProgramServicesAmt>865423</ProgramServicesAmt>
        <ManagementAndGeneralAmt>225834</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <SavingsAndTempCashInvstGrp>
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        <EOYAmt>768194</EOYAmt>
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        <EOYAmt>1100</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
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        <EOYAmt>7949</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>167015</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>144746</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>55672</BOYAmt>
        <EOYAmt>22269</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
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        <EOYAmt>1692193</EOYAmt>
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        <EOYAmt>11950</EOYAmt>
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        <EOYAmt>2503655</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>49272</EOYAmt>
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      <DeferredRevenueGrp>
        <BOYAmt>658353</BOYAmt>
        <EOYAmt>659855</EOYAmt>
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      <OtherLiabilitiesGrp>
        <BOYAmt>1361</BOYAmt>
        <EOYAmt>3206</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>688535</BOYAmt>
        <EOYAmt>712333</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>1812877</BOYAmt>
        <EOYAmt>1791322</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>1812877</BOYAmt>
        <EOYAmt>1791322</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>2501412</BOYAmt>
        <EOYAmt>2503655</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>65322</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>-86877</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus4YearsAmt>759866</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>891593</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>940953</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>963190</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1067449</CurrentTaxYearAmt>
        <TotalAmt>4623051</TotalAmt>
      </GiftsGrantsContrisRcvd509Grp>
      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>759866</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>891593</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>940953</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>963190</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1067449</CurrentTaxYearAmt>
        <TotalAmt>4623051</TotalAmt>
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      <AmountsRcvdDsqlfyPersonGrp>
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      </AmountsRcvdDsqlfyPersonGrp>
      <SubstantialContributorsAmtGrp>
        <TotalAmt>0</TotalAmt>
      </SubstantialContributorsAmtGrp>
      <SubstAndDsqlfyPrsnsTotGrp>
        <TotalAmt>0</TotalAmt>
      </SubstAndDsqlfyPrsnsTotGrp>
      <PublicSupportTotal509Amt>4623051</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
        <CurrentTaxYearMinus4YearsAmt>45722</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>49069</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>48470</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>42252</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>43222</CurrentTaxYearAmt>
        <TotalAmt>228735</TotalAmt>
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      <InvestmentIncomeAndUBTIGrp>
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        <CurrentTaxYearMinus3YearsAmt>49069</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>48470</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>42252</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>43222</CurrentTaxYearAmt>
        <TotalAmt>228735</TotalAmt>
      </InvestmentIncomeAndUBTIGrp>
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        <CurrentTaxYearMinus3YearsAmt>10562</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>40193</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>12039</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>38432</CurrentTaxYearAmt>
        <TotalAmt>109276</TotalAmt>
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      <TotalSupportCalendarYearGrp>
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        <CurrentTaxYearMinus3YearsAmt>951224</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1029616</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1017481</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1149103</CurrentTaxYearAmt>
        <TotalAmt>4961062</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.93190</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.93150</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.04610</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.05210</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
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    <IRS990ScheduleD documentId="RetDoc1040000001">
      <OtherLandBuildingsGrp>
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        <DepreciationAmt>144746</DepreciationAmt>
        <BookValueAmt>22269</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>22269</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>OTHER ACCRUED EXPENSES</Desc>
        <Amt>3206</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>3206</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>1059223</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>-86877</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>-86877</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1146100</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>10479</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>10479</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>1080778</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>10479</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>10479</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>1091257</TotalExpensesPerForm990Amt>
      <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, 2022 OR 2021, 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>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>INVESTMENT EXPENSES 10,479.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHAEL ARCENEAUX</PersonNm>
        <TitleTxt>DEPUTY EXECUTIVE DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>136613</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>37500</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>67059</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>13859</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>19922</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>274953</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>THOMAS DOBBINS</PersonNm>
        <TitleTxt>CHIEF EXECUTIVE OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>192984</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>12000</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>11574</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>216558</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF MANAGERS DID NOT REVIEW THE FORM 990. HOWEVER, THEY DID APPROVE THE FINANCIAL STATEMENT AUDIT. THE EXECUTIVE DIRECTOR REVIEWS 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 XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>REVIEWING THE ANNUAL AUDIT REPORT. THIS PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>ASSOCIATION OF METROPOLITAN WATER AGENCIES</BusinessNameLine1Txt>
        </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>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <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>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>
