<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2020v4.1">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2021-11-15T12:52:23-06:00</ReturnTs>
    <TaxPeriodEndDt>2020-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>510232475</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>Cover &amp; Rossiter PA</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>2711 Centerville Road Suite 100</AddressLine1Txt>
        <CityNm>Wilmington</CityNm>
        <StateAbbreviationCd>DE</StateAbbreviationCd>
        <ZIPCd>19808</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990</ReturnTypeCd>
    <TaxPeriodBeginDt>2020-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>510375307</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>Partnership for the Delaware</BusinessNameLine1Txt>
        <BusinessNameLine2Txt>EstuaryInc</BusinessNameLine2Txt>
      </BusinessName>
      <BusinessNameControlTxt>PART</BusinessNameControlTxt>
      <PhoneNum>3026554990</PhoneNum>
      <USAddress>
        <AddressLine1Txt>110 S Poplar Street No 202</AddressLine1Txt>
        <CityNm>Wilmington</CityNm>
        <StateAbbreviationCd>DE</StateAbbreviationCd>
        <ZIPCd>19801</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Kathy Klein</PersonNm>
      <PersonTitleTxt>Executive Director</PersonTitleTxt>
      <PhoneNum>3026554990</PhoneNum>
      <SignatureDt>2021-11-15</SignatureDt>
      <DiscussWithPaidPreparerInd>1</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>Kathy</PersonFirstNm>
        <PersonLastNm>Klein</PersonLastNm>
      </PersonFullName>
      <SSN>999009999</SSN>
    </SigningOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>Peter Kennedy</PreparerPersonNm>
      <PTIN>P00571422</PTIN>
      <PhoneNum>3026566632</PhoneNum>
      <PreparationDt>2021-11-15</PreparationDt>
    </PreparerPersonGrp>
    <AdditionalFilerInformation>
      <TrustedCustomerGrp>
        <TrustedCustomerCd>2</TrustedCustomerCd>
        <AuthenticationAssuranceLevelCd>AAL1</AuthenticationAssuranceLevelCd>
        <IdentityAssuranceLevelCd>IAL1</IdentityAssuranceLevelCd>
      </TrustedCustomerGrp>
    </AdditionalFilerInformation>
    <TaxYr>2020</TaxYr>
    <BuildTS>2022-09-23 18:48:47Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="7">
    <IRS990 documentId="RetDoc1038000001" referenceDocumentId="RetDoc1044400001">
      <PrincipalOfficerNm>Kathy Klein</PrincipalOfficerNm>
      <USAddress>
        <AddressLine1Txt>110 S Poplar Street No 202</AddressLine1Txt>
        <CityNm>Wilmington</CityNm>
        <StateAbbreviationCd>DE</StateAbbreviationCd>
        <ZIPCd>19801</ZIPCd>
      </USAddress>
      <GrossReceiptsAmt>2628822</GrossReceiptsAmt>
      <GroupReturnForAffiliatesInd>0</GroupReturnForAffiliatesInd>
      <Organization501c3Ind>X</Organization501c3Ind>
      <WebsiteAddressTxt>www.delawareestuary.org</WebsiteAddressTxt>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <FormationYr>1996</FormationYr>
      <LegalDomicileStateCd>DE</LegalDomicileStateCd>
      <ActivityOrMissionDesc>Partnership for the Delaware Estuary, Inc. (PDE), host of the Delaware Estuary program, leads science-based and collaborative efforts to improve the tidal Delaware River and Bay, which spans Delaware, New Jersey, and Pennsylvania.</ActivityOrMissionDesc>
      <VotingMembersGoverningBodyCnt>20</VotingMembersGoverningBodyCnt>
      <VotingMembersIndependentCnt>20</VotingMembersIndependentCnt>
      <TotalEmployeeCnt>29</TotalEmployeeCnt>
      <TotalVolunteersCnt>160</TotalVolunteersCnt>
      <TotalGrossUBIAmt>0</TotalGrossUBIAmt>
      <NetUnrelatedBusTxblIncmAmt>0</NetUnrelatedBusTxblIncmAmt>
      <PYContributionsGrantsAmt>2518282</PYContributionsGrantsAmt>
      <CYContributionsGrantsAmt>2574860</CYContributionsGrantsAmt>
      <PYProgramServiceRevenueAmt>32825</PYProgramServiceRevenueAmt>
      <CYProgramServiceRevenueAmt>22084</CYProgramServiceRevenueAmt>
      <PYInvestmentIncomeAmt>37381</PYInvestmentIncomeAmt>
      <CYInvestmentIncomeAmt>16378</CYInvestmentIncomeAmt>
      <PYOtherRevenueAmt>42023</PYOtherRevenueAmt>
      <CYOtherRevenueAmt>15500</CYOtherRevenueAmt>
      <PYTotalRevenueAmt>2630511</PYTotalRevenueAmt>
      <CYTotalRevenueAmt>2628822</CYTotalRevenueAmt>
      <PYGrantsAndSimilarPaidAmt>0</PYGrantsAndSimilarPaidAmt>
      <CYGrantsAndSimilarPaidAmt>0</CYGrantsAndSimilarPaidAmt>
      <PYBenefitsPaidToMembersAmt>0</PYBenefitsPaidToMembersAmt>
      <CYBenefitsPaidToMembersAmt>0</CYBenefitsPaidToMembersAmt>
      <PYSalariesCompEmpBnftPaidAmt>1677576</PYSalariesCompEmpBnftPaidAmt>
      <CYSalariesCompEmpBnftPaidAmt>1628495</CYSalariesCompEmpBnftPaidAmt>
      <PYTotalProfFndrsngExpnsAmt>0</PYTotalProfFndrsngExpnsAmt>
      <CYTotalProfFndrsngExpnsAmt>0</CYTotalProfFndrsngExpnsAmt>
      <CYTotalFundraisingExpenseAmt>70525</CYTotalFundraisingExpenseAmt>
      <PYOtherExpensesAmt>1004585</PYOtherExpensesAmt>
      <CYOtherExpensesAmt>934350</CYOtherExpensesAmt>
      <PYTotalExpensesAmt>2682161</PYTotalExpensesAmt>
      <CYTotalExpensesAmt>2562845</CYTotalExpensesAmt>
      <PYRevenuesLessExpensesAmt>-51650</PYRevenuesLessExpensesAmt>
      <CYRevenuesLessExpensesAmt>65977</CYRevenuesLessExpensesAmt>
      <TotalAssetsBOYAmt>1878892</TotalAssetsBOYAmt>
      <TotalAssetsEOYAmt>2175000</TotalAssetsEOYAmt>
      <TotalLiabilitiesBOYAmt>350028</TotalLiabilitiesBOYAmt>
      <TotalLiabilitiesEOYAmt>559871</TotalLiabilitiesEOYAmt>
      <NetAssetsOrFundBalancesBOYAmt>1528864</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>1615129</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <MissionDesc>Partnership for the Delaware Estuary, Inc. (PDE), host of the Delaware Estuary Program, leads science-based and collaborative efforts to improve the tidal Delaware River and Bay, which spans Delaware, New Jersey, and Pennsylvania.</MissionDesc>
      <SignificantNewProgramSrvcInd>0</SignificantNewProgramSrvcInd>
      <SignificantChangeInd>0</SignificantChangeInd>
      <ExpenseAmt>1918674</ExpenseAmt>
      <RevenueAmt>36417</RevenueAmt>
      <Desc>Science and Research: Monitored and maintained 11 living shoreline installations in NJ and DE, including sites at Money Island, NJ and Misipillion Harbor, DE. A new living shoreline was installed at Bartram's Garden on the Schuylkill River in PA. Freshwater mussel research continued in 2020, including exploring the use of these animals to improve water quality in stormwater ponds and lakes. Planning continued for the new freshwater mussel hatchery, which will be constructed on the grounds of Bartram's' Garden in Philadelphia, PA. An architectural design firm was hired, and it's anticipated that construction will begin in fall 2022.Education and Outreach: PDE had to rethink the way that we offer these programs as a result on the Covid pandemic. PDE continued to conduct school and community outreach, with most of this work taking place virtually. PDE led and participated in numerous outreach events in 2020 including Wilmington Delaware's Earth and Arbor Day Celebration and the Delaware River Festival. Through these and other programs, PDE reached thousands of people with information about PDE's work and the importance of protecting the Delaware River Bay and their tributaries.</Desc>
      <TotalProgramServiceExpensesAmt>1918674</TotalProgramServiceExpensesAmt>
      <DescribedInSection501c3Ind referenceDocumentId="RetDoc1039100001">1</DescribedInSection501c3Ind>
      <ScheduleBRequiredInd referenceDocumentId="RetDoc1234500001">1</ScheduleBRequiredInd>
      <PoliticalCampaignActyInd referenceDocumentId="RetDoc1039700001">0</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd referenceDocumentId="RetDoc1039700001">1</LobbyingActivitiesInd>
      <SubjectToProxyTaxInd referenceDocumentId="RetDoc1039700001">0</SubjectToProxyTaxInd>
      <DonorAdvisedFundInd referenceDocumentId="RetDoc1040000001">0</DonorAdvisedFundInd>
      <ConservationEasementsInd referenceDocumentId="RetDoc1040000001">0</ConservationEasementsInd>
      <CollectionsOfArtInd referenceDocumentId="RetDoc1040000001">0</CollectionsOfArtInd>
      <CreditCounselingInd referenceDocumentId="RetDoc1040000001">0</CreditCounselingInd>
      <DonorRstrOrQuasiEndowmentsInd>0</DonorRstrOrQuasiEndowmentsInd>
      <ReportLandBuildingEquipmentInd referenceDocumentId="RetDoc1040000001">1</ReportLandBuildingEquipmentInd>
      <ReportInvestmentsOtherSecInd referenceDocumentId="RetDoc1040000001">0</ReportInvestmentsOtherSecInd>
      <ReportProgramRelatedInvstInd referenceDocumentId="RetDoc1040000001">0</ReportProgramRelatedInvstInd>
      <ReportOtherAssetsInd referenceDocumentId="RetDoc1040000001">0</ReportOtherAssetsInd>
      <ReportOtherLiabilitiesInd referenceDocumentId="RetDoc1040000001">0</ReportOtherLiabilitiesInd>
      <IncludeFIN48FootnoteInd referenceDocumentId="RetDoc1040000001">0</IncludeFIN48FootnoteInd>
      <IndependentAuditFinclStmtInd referenceDocumentId="RetDoc1040000001">1</IndependentAuditFinclStmtInd>
      <ConsolidatedAuditFinclStmtInd referenceDocumentId="RetDoc1040000001">0</ConsolidatedAuditFinclStmtInd>
      <SchoolOperatingInd>0</SchoolOperatingInd>
      <ForeignOfficeInd>0</ForeignOfficeInd>
      <ForeignActivitiesInd>0</ForeignActivitiesInd>
      <MoreThan5000KToOrgInd>0</MoreThan5000KToOrgInd>
      <MoreThan5000KToIndividualsInd>0</MoreThan5000KToIndividualsInd>
      <ProfessionalFundraisingInd referenceDocumentId="RetDoc1041300001">0</ProfessionalFundraisingInd>
      <FundraisingActivitiesInd referenceDocumentId="RetDoc1041300001">1</FundraisingActivitiesInd>
      <GamingActivitiesInd referenceDocumentId="RetDoc1041300001">0</GamingActivitiesInd>
      <OperateHospitalInd>0</OperateHospitalInd>
      <GrantsToOrganizationsInd>0</GrantsToOrganizationsInd>
      <GrantsToIndividualsInd>0</GrantsToIndividualsInd>
      <ScheduleJRequiredInd>0</ScheduleJRequiredInd>
      <TaxExemptBondsInd>0</TaxExemptBondsInd>
      <EngagedInExcessBenefitTransInd>0</EngagedInExcessBenefitTransInd>
      <PYExcessBenefitTransInd>0</PYExcessBenefitTransInd>
      <LoanOutstandingInd>0</LoanOutstandingInd>
      <GrantToRelatedPersonInd>0</GrantToRelatedPersonInd>
      <BusinessRlnWithOrgMemInd>0</BusinessRlnWithOrgMemInd>
      <BusinessRlnWithFamMemInd>0</BusinessRlnWithFamMemInd>
      <BusinessRlnWith35CtrlEntInd>0</BusinessRlnWith35CtrlEntInd>
      <DeductibleNonCashContriInd>0</DeductibleNonCashContriInd>
      <DeductibleArtContributionInd>0</DeductibleArtContributionInd>
      <TerminateOperationsInd>0</TerminateOperationsInd>
      <PartialLiquidationInd>0</PartialLiquidationInd>
      <DisregardedEntityInd>0</DisregardedEntityInd>
      <RelatedEntityInd>0</RelatedEntityInd>
      <RelatedOrganizationCtrlEntInd>0</RelatedOrganizationCtrlEntInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>0</TrnsfrExmptNonChrtblRltdOrgInd>
      <ActivitiesConductedPrtshpInd>0</ActivitiesConductedPrtshpInd>
      <ScheduleORequiredInd>1</ScheduleORequiredInd>
      <IRPDocumentCnt>20</IRPDocumentCnt>
      <IRPDocumentW2GCnt>0</IRPDocumentW2GCnt>
      <BackupWthldComplianceInd>1</BackupWthldComplianceInd>
      <EmployeeCnt>29</EmployeeCnt>
      <EmploymentTaxReturnsFiledInd>1</EmploymentTaxReturnsFiledInd>
      <UnrelatedBusIncmOverLimitInd>0</UnrelatedBusIncmOverLimitInd>
      <ForeignFinancialAccountInd>0</ForeignFinancialAccountInd>
      <ProhibitedTaxShelterTransInd>0</ProhibitedTaxShelterTransInd>
      <TaxablePartyNotificationInd>0</TaxablePartyNotificationInd>
      <NondeductibleContributionsInd>0</NondeductibleContributionsInd>
      <QuidProQuoContributionsInd>0</QuidProQuoContributionsInd>
      <Form8282PropertyDisposedOfInd>0</Form8282PropertyDisposedOfInd>
      <RcvFndsToPayPrsnlBnftCntrctInd>0</RcvFndsToPayPrsnlBnftCntrctInd>
      <PayPremiumsPrsnlBnftCntrctInd>0</PayPremiumsPrsnlBnftCntrctInd>
      <IndoorTanningServicesInd>0</IndoorTanningServicesInd>
      <SubjToTaxRmnrtnExPrchtPymtInd>0</SubjToTaxRmnrtnExPrchtPymtInd>
      <SubjectToExcsTaxNetInvstIncInd>0</SubjectToExcsTaxNetInvstIncInd>
      <InfoInScheduleOPartVIInd>X</InfoInScheduleOPartVIInd>
      <GoverningBodyVotingMembersCnt>20</GoverningBodyVotingMembersCnt>
      <IndependentVotingMemberCnt>20</IndependentVotingMemberCnt>
      <FamilyOrBusinessRlnInd>0</FamilyOrBusinessRlnInd>
      <DelegationOfMgmtDutiesInd>0</DelegationOfMgmtDutiesInd>
      <ChangeToOrgDocumentsInd>0</ChangeToOrgDocumentsInd>
      <MaterialDiversionOrMisuseInd>0</MaterialDiversionOrMisuseInd>
      <MembersOrStockholdersInd>0</MembersOrStockholdersInd>
      <ElectionOfBoardMembersInd>0</ElectionOfBoardMembersInd>
      <DecisionsSubjectToApprovaInd>0</DecisionsSubjectToApprovaInd>
      <MinutesOfGoverningBodyInd>1</MinutesOfGoverningBodyInd>
      <MinutesOfCommitteesInd>1</MinutesOfCommitteesInd>
      <OfficerMailingAddressInd>0</OfficerMailingAddressInd>
      <LocalChaptersInd>0</LocalChaptersInd>
      <Form990ProvidedToGvrnBodyInd>1</Form990ProvidedToGvrnBodyInd>
      <ConflictOfInterestPolicyInd>1</ConflictOfInterestPolicyInd>
      <AnnualDisclosureCoveredPrsnInd>1</AnnualDisclosureCoveredPrsnInd>
      <RegularMonitoringEnfrcInd>1</RegularMonitoringEnfrcInd>
      <WhistleblowerPolicyInd>1</WhistleblowerPolicyInd>
      <DocumentRetentionPolicyInd>1</DocumentRetentionPolicyInd>
      <CompensationProcessCEOInd>1</CompensationProcessCEOInd>
      <CompensationProcessOtherInd>1</CompensationProcessOtherInd>
      <InvestmentInJointVentureInd>0</InvestmentInJointVentureInd>
      <StatesWhereCopyOfReturnIsFldCd>PA</StatesWhereCopyOfReturnIsFldCd>
      <StatesWhereCopyOfReturnIsFldCd>NJ</StatesWhereCopyOfReturnIsFldCd>
      <OtherWebsiteInd>X</OtherWebsiteInd>
      <UponRequestInd>X</UponRequestInd>
      <BooksInCareOfDetail>
        <BusinessName>
          <BusinessNameLine1Txt>The Organization</BusinessNameLine1Txt>
        </BusinessName>
        <PhoneNum>3026554990</PhoneNum>
        <USAddress>
          <AddressLine1Txt>110 S Poplar Street No 202</AddressLine1Txt>
          <CityNm>Wilmington</CityNm>
          <StateAbbreviationCd>DE</StateAbbreviationCd>
          <ZIPCd>19801</ZIPCd>
        </USAddress>
      </BooksInCareOfDetail>
      <Form990PartVIISectionAGrp>
        <PersonNm>Josheph Tarsavage</PersonNm>
        <TitleTxt>Chairman</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Carol R Collier</PersonNm>
        <TitleTxt>Vice Chair</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jill E Voorhees</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>David J Athey</PersonNm>
        <TitleTxt>Secretary</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Helen L Gregory</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>David Small</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Lawrence D Malizzi</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Shahjabin Alam</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Laura Copeland</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Colleen M Arnold</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Michael Dillon</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Craig Durand</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>David Bushek</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Katherine S Eberhart</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Patricia Elkis</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Gus Mergenthaler</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Ronald B Heun Jr</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jeffrey J Pantazes</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Roxanne E Jayne Esq</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Kristina Kesack</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Nancy E Descano</PersonNm>
        <TitleTxt>Deputy Executive Director</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>101835</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>13402</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Kathy E Klein</PersonNm>
        <TitleTxt>Executive Director</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>117107</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>4025</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Danielle A Kreeger</PersonNm>
        <TitleTxt>Senior Science Director</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>125075</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>4803</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>344017</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>22230</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>3</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>0</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <CntrctRcvdGreaterThan100KCnt>0</CntrctRcvdGreaterThan100KCnt>
      <FundraisingAmt>16360</FundraisingAmt>
      <GovernmentGrantsAmt>1858787</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>699713</AllOtherContributionsAmt>
      <NoncashContributionsAmt>12377</NoncashContributionsAmt>
      <TotalContributionsAmt>2574860</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>Education Programs</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>22084</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>22084</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>22084</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>16378</TotalRevenueColumnAmt>
        <ExclusionAmt>16378</ExclusionAmt>
      </InvestmentIncomeGrp>
      <FundraisingGrossIncomeAmt>1167</FundraisingGrossIncomeAmt>
      <ContriRptFundraisingEventAmt>16360</ContriRptFundraisingEventAmt>
      <FundraisingDirectExpensesAmt>0</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>1167</TotalRevenueColumnAmt>
        <ExclusionAmt>1167</ExclusionAmt>
      </NetIncmFromFundraisingEvtGrp>
      <OtherRevenueMiscGrp>
        <Desc>Delaware License Plate</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>14333</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>14333</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>14333</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>2628822</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>36417</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>17545</ExclusionAmt>
      </TotalRevenueGrp>
      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>366246</TotalAmt>
        <ProgramServicesAmt>267187</ProgramServicesAmt>
        <ManagementAndGeneralAmt>86720</ManagementAndGeneralAmt>
        <FundraisingAmt>12339</FundraisingAmt>
      </CompCurrentOfcrDirectorsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>1016131</TotalAmt>
        <ProgramServicesAmt>730197</ProgramServicesAmt>
        <ManagementAndGeneralAmt>250832</ManagementAndGeneralAmt>
        <FundraisingAmt>35102</FundraisingAmt>
      </OtherSalariesAndWagesGrp>
      <PensionPlanContributionsGrp>
        <TotalAmt>23633</TotalAmt>
        <ProgramServicesAmt>14236</ProgramServicesAmt>
        <ManagementAndGeneralAmt>8243</ManagementAndGeneralAmt>
        <FundraisingAmt>1154</FundraisingAmt>
      </PensionPlanContributionsGrp>
      <OtherEmployeeBenefitsGrp>
        <TotalAmt>122202</TotalAmt>
        <ProgramServicesAmt>100108</ProgramServicesAmt>
        <ManagementAndGeneralAmt>17632</ManagementAndGeneralAmt>
        <FundraisingAmt>4462</FundraisingAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>100283</TotalAmt>
        <ProgramServicesAmt>73240</ProgramServicesAmt>
        <ManagementAndGeneralAmt>23498</ManagementAndGeneralAmt>
        <FundraisingAmt>3545</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>11191</TotalAmt>
        <ProgramServicesAmt>7372</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3819</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>27504</TotalAmt>
        <ManagementAndGeneralAmt>27504</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>298117</TotalAmt>
        <ProgramServicesAmt>283696</ProgramServicesAmt>
        <ManagementAndGeneralAmt>13745</ManagementAndGeneralAmt>
        <FundraisingAmt>676</FundraisingAmt>
      </FeesForServicesOtherGrp>
      <OfficeExpensesGrp>
        <TotalAmt>107841</TotalAmt>
        <ProgramServicesAmt>76161</ProgramServicesAmt>
        <ManagementAndGeneralAmt>30065</ManagementAndGeneralAmt>
        <FundraisingAmt>1615</FundraisingAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>48697</TotalAmt>
        <ProgramServicesAmt>14148</ProgramServicesAmt>
        <ManagementAndGeneralAmt>34549</ManagementAndGeneralAmt>
      </InformationTechnologyGrp>
      <OccupancyGrp>
        <TotalAmt>108391</TotalAmt>
        <ProgramServicesAmt>83461</ProgramServicesAmt>
        <ManagementAndGeneralAmt>14090</ManagementAndGeneralAmt>
        <FundraisingAmt>10840</FundraisingAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>23907</TotalAmt>
        <ProgramServicesAmt>23035</ProgramServicesAmt>
        <ManagementAndGeneralAmt>232</ManagementAndGeneralAmt>
        <FundraisingAmt>640</FundraisingAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>27114</TotalAmt>
        <ProgramServicesAmt>14556</ProgramServicesAmt>
        <ManagementAndGeneralAmt>12558</ManagementAndGeneralAmt>
      </ConferencesMeetingsGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>13022</TotalAmt>
        <ManagementAndGeneralAmt>13022</ManagementAndGeneralAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>20760</TotalAmt>
        <ManagementAndGeneralAmt>20760</ManagementAndGeneralAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Direct Program Expenses</Desc>
        <TotalAmt>207472</TotalAmt>
        <ProgramServicesAmt>202770</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4702</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Subgrant Expenses</Desc>
        <TotalAmt>21857</TotalAmt>
        <ProgramServicesAmt>21857</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Dues and Memberships</Desc>
        <TotalAmt>10256</TotalAmt>
        <ProgramServicesAmt>3482</ProgramServicesAmt>
        <ManagementAndGeneralAmt>6766</ManagementAndGeneralAmt>
        <FundraisingAmt>8</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Telephone</Desc>
        <TotalAmt>6191</TotalAmt>
        <ProgramServicesAmt>1873</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4318</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <AllOtherExpensesGrp>
        <TotalAmt>2030</TotalAmt>
        <ProgramServicesAmt>1295</ProgramServicesAmt>
        <ManagementAndGeneralAmt>591</ManagementAndGeneralAmt>
        <FundraisingAmt>144</FundraisingAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>2562845</TotalAmt>
        <ProgramServicesAmt>1918674</ProgramServicesAmt>
        <ManagementAndGeneralAmt>573646</ManagementAndGeneralAmt>
        <FundraisingAmt>70525</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <CashNonInterestBearingGrp>
        <BOYAmt>362388</BOYAmt>
        <EOYAmt>565722</EOYAmt>
      </CashNonInterestBearingGrp>
      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>715365</BOYAmt>
        <EOYAmt>641989</EOYAmt>
      </PledgesAndGrantsReceivableGrp>
      <InventoriesForSaleOrUseGrp>
        <BOYAmt>3415</BOYAmt>
        <EOYAmt>4500</EOYAmt>
      </InventoriesForSaleOrUseGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>32866</BOYAmt>
        <EOYAmt>23684</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>184913</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>167721</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>29357</BOYAmt>
        <EOYAmt>17192</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>733833</BOYAmt>
        <EOYAmt>920245</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>1668</BOYAmt>
        <EOYAmt>1668</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>1878892</BOYAmt>
        <EOYAmt>2175000</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>127073</BOYAmt>
        <EOYAmt>360309</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <DeferredRevenueGrp>
        <BOYAmt>222955</BOYAmt>
        <EOYAmt>199562</EOYAmt>
      </DeferredRevenueGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>350028</BOYAmt>
        <EOYAmt>559871</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>1421481</BOYAmt>
        <EOYAmt>1457609</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>107383</BOYAmt>
        <EOYAmt>157520</EOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>1528864</BOYAmt>
        <EOYAmt>1615129</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>1878892</BOYAmt>
        <EOYAmt>2175000</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>65977</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>20288</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>1</FederalGrantAuditRequiredInd>
      <FederalGrantAuditPerformedInd>1</FederalGrantAuditPerformedInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>2653026</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>2833810</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2328464</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>2518282</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2574860</CurrentTaxYearAmt>
        <TotalAmt>12908442</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>2653026</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>2833810</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2328464</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>2518282</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2574860</CurrentTaxYearAmt>
        <TotalAmt>12908442</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>1057123</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>11851319</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>5112</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>9447</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>12626</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>37381</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>16378</CurrentTaxYearAmt>
        <TotalAmt>80944</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>14650</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>20403</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>38793</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>11760</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>14333</CurrentTaxYearAmt>
        <TotalAmt>99939</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>13089325</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>272605</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.90540</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.92220</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
    </IRS990ScheduleA>
    <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>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleC documentId="RetDoc1039700001">
      <VolunteersInd>1</VolunteersInd>
      <PaidStaffOrManagementInd>0</PaidStaffOrManagementInd>
      <MediaAdvertisementsInd>0</MediaAdvertisementsInd>
      <MailingsMembersInd>0</MailingsMembersInd>
      <PublicationsOrBroadcastInd>0</PublicationsOrBroadcastInd>
      <GrantsOtherOrganizationsInd>1</GrantsOtherOrganizationsInd>
      <GrantsOtherOrganizationsAmt>450</GrantsOtherOrganizationsAmt>
      <DirectContactLegislatorsInd>1</DirectContactLegislatorsInd>
      <DirectContactLegislatorsAmt>1851</DirectContactLegislatorsAmt>
      <RalliesDemonstrationsInd>0</RalliesDemonstrationsInd>
      <OtherActivitiesInd>0</OtherActivitiesInd>
      <TotalLobbyingExpendituresAmt>2301</TotalLobbyingExpendituresAmt>
      <NotDescribedSection501c3Ind>0</NotDescribedSection501c3Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II-B, Line 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>In 2020, 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 $1,851 for 2020. PDE also paid membership dues of $4,500 to the Association of National Estuary Programs 10% of which were used for lobbying.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>35624</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>35324</DepreciationAmt>
        <BookValueAmt>300</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>149289</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>132397</DepreciationAmt>
        <BookValueAmt>16892</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>17192</TotalBookValueLandBuildingsAmt>
      <TotalRevEtcAuditedFinclStmtAmt>2649110</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>20288</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>20288</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>2628822</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>2628822</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>2562845</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>2562845</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>2562845</TotalExpensesPerForm990Amt>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>Dinner / Auction</Event1Nm>
        <GrossReceiptsEvent1Amt>17527</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>16360</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>1167</GrossRevenueEvent1Amt>
        <GrossReceiptsTotalAmt>17527</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>16360</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>1167</GrossRevenueTotalEventsAmt>
        <NetIncomeSummaryAmt>1167</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <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>
      </SupplementalInformationDetail>
      <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>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Contracted services: Program service expenses 283,696. Management and general expenses 13,745. Fundraising expenses 676. Total expenses 298,117.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
