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        <AdministrativeExpensesAmt>2372</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>269881</EndYearBalanceAmt>
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        <AdministrativeExpensesAmt>2126</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>290533</EndYearBalanceAmt>
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      <BoardDesignatedBalanceEOYPct>1.00000</BoardDesignatedBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>true</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>false</RelatedOrgListSchRInd>
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>43005</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>43005</DepreciationAmt>
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      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>256586</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>201071</DepreciationAmt>
        <BookValueAmt>55515</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>1574</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1574</DepreciationAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>55515</TotalBookValueLandBuildingsAmt>
      <TotalBookValueSecuritiesAmt>320321</TotalBookValueSecuritiesAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Operating Lease Liabilities</Desc>
        <Amt>355224</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>355224</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>5263172</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>29491</NetUnrealizedGainsInvstAmt>
      <DonatedServicesAndUseFcltsAmt>1013002</DonatedServicesAndUseFcltsAmt>
      <OtherRevenueAmt>105855</OtherRevenueAmt>
      <RevenueNotReportedAmt>1148348</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>4114824</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>2454</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>2454</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>4117278</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>4216087</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>1013002</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>105855</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>1118857</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>3097230</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>2454</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>2454</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>3099684</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>Baykeeper is a qualified organization exempt from federal income taxes and state franchise taxes under 501(c)(3) of the Internal Revenue Code (IRC) and 23701d of the California Revenue and Taxation Code, respectively.U.S. GAAP requires Baykeeper management to evaluate tax positions taken by Baykeeper and recognize a tax liability (or asset) if Baykeeper has taken an uncertain position that, more likely than not, would not be sustained upon examination by the Internal Revenue Service.Baykeeper is not aware of any uncertain tax positions as of June 30, 2025.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 2d: Other revenue amounts included in F/S but not included on form 990</FormAndLineReferenceDesc>
        <ExplanationTxt>Fundraising Expenses $105855</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d: Other expenses and losses per audited F/S</FormAndLineReferenceDesc>
        <ExplanationTxt>Fundraising Expenses $105855</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="IRS990ScheduleG" softwareId="24020490" softwareVersionNum="2024v5.2">
      <AgrmtProfFundraisingActyInd>false</AgrmtProfFundraisingActyInd>
      <FundraisingEventInformationGrp>
        <Event1Nm>35th Anniversary</Event1Nm>
        <GrossReceiptsEvent1Amt>270846</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>215961</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>54885</GrossRevenueEvent1Amt>
        <RentFacilityCostsEvent1Amt>22000</RentFacilityCostsEvent1Amt>
        <FoodAndBeverageEvent1Amt>16028</FoodAndBeverageEvent1Amt>
        <OtherDirectExpensesEvent1Amt>36128</OtherDirectExpensesEvent1Amt>
        <Event2Nm>Bay Celebration</Event2Nm>
        <GrossReceiptsEvent2Amt>91703</GrossReceiptsEvent2Amt>
        <CharitableContriEvent2Amt>66231</CharitableContriEvent2Amt>
        <GrossRevenueEvent2Amt>25472</GrossRevenueEvent2Amt>
        <RentFacilityCostsEvent2Amt>5000</RentFacilityCostsEvent2Amt>
        <FoodAndBeverageEvent2Amt>9253</FoodAndBeverageEvent2Amt>
        <OtherDirectExpensesEvent2Amt>17111</OtherDirectExpensesEvent2Amt>
        <OtherEventsTotalCnt>2</OtherEventsTotalCnt>
        <GrossReceiptsOtherEventsAmt>65980</GrossReceiptsOtherEventsAmt>
        <CharitableContriOtherEventsAmt>65980</CharitableContriOtherEventsAmt>
        <OthDirectExpnssOtherEventsAmt>335</OthDirectExpnssOtherEventsAmt>
        <GrossReceiptsTotalAmt>428529</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>348172</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>80357</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>27000</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>25281</FoodAndBeverageTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>53574</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>105855</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-25498</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleJ documentId="IRS990ScheduleJ" softwareId="24020490" softwareVersionNum="2024v5.2">
      <IndependentConsultantInd>X</IndependentConsultantInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Sejal Choksi-Chugh</PersonNm>
        <TitleTxt>Executive Dir.</TitleTxt>
        <BaseCompensationFilingOrgAmt>187448</BaseCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>9152</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>2355</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>198955</TotalCompensationFilingOrgAmt>
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    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="IRS990ScheduleM" softwareId="24020490" softwareVersionNum="2024v5.2">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>4</ContributionCnt>
        <NoncashContributionsRptF990Amt>10128</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Airline Credits</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>20000</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Event Supplies</Desc>
        <ContributionCnt>50</ContributionCnt>
        <NoncashContributionsRptF990Amt>65253</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>false</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
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    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="24020490" softwareVersionNum="2024v5.2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A paid preparer prepares the 990, the financial officer reviews it and submits it to the Executive Director, the Finance Committee, and the Governance Committee for review and comment. The Executive Director and Treasurer approve it. In addition, the entire Board of Directors receives the 990 before the return is filed.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, EACH BOARD MEMBER AND OFFICER SUBMITS A CONFLICT OF INTEREST DISCLOSURE FORM, WHICH THE GOVERNANCE COMMITTEE REVIEWS. ANY ACTUAL OR APPARENT CONFLICT IS DISCUSSED WITH THAT BOARD MEMBER, INCLUDING THE NEED FOR RECUSAL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF DIRECTORS DETERMINES THE COMPENSATION OF THE EXECUTIVE DIRECTOR ANNUALLY FOLLOWING A PERFORMANCE REVIEW CONDUCTED BY THE GOVERNANCE COMMITTEE. COMPENSATION IS DETERMINED FOLLOWING REVIEW OF COMPARABILITY DATA, INCLUDING THE COMPENSATION AND BENEFITS SURVEY PUBLISHED ANNUALLY BY THE CENTER FOR NONPROFIT MANAGEMENT. PREVIOUS YEAR'S DATA WAS ALSO REVIEWED BY OUTSIDE CONSULTANTS. ALL DELIBERATIONS AND DECISIONS ARE CONTEMPORANEOUSLY SUBSTANTIATED BY THE GOVERNANCE COMMITTEE AND THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15b</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR WITH BOARD OF DIRECTORS APPROVAL DETERMINES THE COMPENSATION OF THE FINANCE DIRECTOR ANNUALLY FOLLOWING A PERFORMANCE REVIEW. COMPENSATION IS DETERMINED FOLLOWING REVIEW OF COMPARABILITY DATA, INCLUDING THE COMPENSATION AND BENEFITS SURVEY PUBLISHED ANNUALLY BY THE CENTER FOR NONPROFIT MANAGEMENT. PREVIOUS YEAR'S DATA WAS ALSO REVIEWED BY OUTSIDE CONSULTANTS. ALL DELIBERATIONS AND DECISIONS ARE CONTEMPORANEOUSLY SUBSTANTIATED BY THE EXECUTIVE DIRECTOR AND GOVERNANCE COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Organization Documents publicly available. Baykeeper makes its governing documents and policies available upon reasonable request and financial statements are available upon reasonable request and on own website.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, SUMMARY, LINE 22 - NET ASSETS OR FUND BALANCES</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INCREASE IN NET ASSETS, LIKE REVENUE, IS DUE TO THE DONATIONS DESIGNATED FOR LEGAL RESERVES AND PROGRAMMATIC WORK.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, SUMMARY, LINE 8</FormAndLineReferenceDesc>
        <ExplanationTxt>CONTRIBUTIONS AND GRANTS REVENUE IS SHOWING AN INCREASE DUE TO DONATIONS WHICH SUPPORT LEGAL RESERVES AND FUTURE YEAR'S PROGRAMATIC EXPENSES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART X, LINE 14; INTANGIBLE ASSETS</FormAndLineReferenceDesc>
        <ExplanationTxt>INTANGIBLE ASSETS REPRESENTS RIGHT OF USE ASSETS FOR THE OFFICE SPACE LEASE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART X, LINE 19; DEFERRED REVENUE</FormAndLineReferenceDesc>
        <ExplanationTxt>DEFERRED REVENUE INCLUDES $202,000 OF LOAN FUNDS USED TO COVER LITIGATION EXPENSES IN CASES BAYKEEPER BRINGS AGAINST POLLUTERS. IF BAYKEEPER RECEIVES PAYMENTS WHEN THE LITIGATION IS RESOLVED, THE LOAN FUNDS MAY BE PAID BACK. IF BAYKEEPER RECEIVES NOPAYMENTS FROM RESOLVED LITIGATION, BAYKEEPER MAY KEEP FUNDS. DEFERRED REVENUE ALSO INCLUDES $165,000 OF UNEARNED REVENUE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART X, LINE 25; OTHER LIABILITIES</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER LIABILITIES REPRESENTS DEFERRED RENT LIABILITY FOR THE OFFICE SPACE LEASE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>