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        <ManagementAndGeneralAmt>18357</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>Direct Program Expenses</Desc>
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      <OtherExpensesGrp>
        <Desc>Telephone</Desc>
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      <OtherExpensesGrp>
        <Desc>Dues and Memberships</Desc>
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        <CurrentTaxYearMinus1YearAmt>2574860</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2594336</CurrentTaxYearAmt>
        <TotalAmt>12849752</TotalAmt>
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        <CurrentTaxYearMinus1YearAmt>2574860</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2594336</CurrentTaxYearAmt>
        <TotalAmt>12849752</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>841318</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>12008434</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>9447</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>12626</CurrentTaxYearMinus3YearsAmt>
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        <CurrentTaxYearMinus1YearAmt>16378</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>14708</CurrentTaxYearAmt>
        <TotalAmt>90540</TotalAmt>
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        <CurrentTaxYearMinus1YearAmt>14333</CurrentTaxYearMinus1YearAmt>
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          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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      <MailingsMembersInd>0</MailingsMembersInd>
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        <FormAndLineReferenceDesc>Part II-B, Line 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>In 2021, PDE's lobbying activities consisted of communication by its Executive Director with elected/appointed officials by phone, email, and in person to express support for Federal funding for the National Estuary Program, Federal reauthorization of the National Estuary Program, advancement of the Delaware River Basin Conservation Act in Congress, and State of Delaware funding for the Delaware Estuary. The total expenses amounted to $2,171 for 2021. PDE also paid membership dues of $4,500 to the Association of National Estuary Programs 10% of which were used for lobbying.</ExplanationTxt>
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        <GrossRevenueEvent1Amt>15342</GrossRevenueEvent1Amt>
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        <GrossRevenueTotalEventsAmt>15342</GrossRevenueTotalEventsAmt>
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      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Software and licenses</Desc>
        <ContributionCnt>3</ContributionCnt>
        <NoncashContributionsRptF990Amt>59304</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Intern and volunteers</Desc>
        <ContributionCnt>5</ContributionCnt>
        <NoncashContributionsRptF990Amt>9600</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Auction items</Desc>
        <ContributionCnt>63</ContributionCnt>
        <NoncashContributionsRptF990Amt>8681</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
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      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Form 990 is distributed to the Board and the Executive Director for review prior to its filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Board members are asked annually to disclose any interests that could give rise to a conflict. The policy is regularly monitored by the Executive Director.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>PDE uses comparability data when determining the Executive Director's and key employees' salaries.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing documents are available upon request at PDE's offices during regular business hours.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Contracted services: Program service expenses 199,166. Management and general expenses 54,412. Fundraising expenses 1,944. Total expenses 255,522. Professional fees: Program service expenses 1,215. Management and general expenses 5,240. Fundraising expenses 0. Total expenses 6,455.</ExplanationTxt>
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</Return>
