<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" returnVersion="2021v4.0">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2022-09-12T08:50:48-04:00</ReturnTs>
    <TaxPeriodEndDt>2021-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>520619968</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>FAW CASSON &amp; CO LLP</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>160 GREENTREE DRIVE SUITE 203</AddressLine1Txt>
        <CityNm>DOVER</CityNm>
        <StateAbbreviationCd>DE</StateAbbreviationCd>
        <ZIPCd>19904</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2021-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>813997902</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>DIAMOND STATE SUSTAINABILITY</BusinessNameLine1Txt>
        <BusinessNameLine2Txt>CORPORATION</BusinessNameLine2Txt>
      </BusinessName>
      <BusinessNameControlTxt>DIAM</BusinessNameControlTxt>
      <PhoneNum>3023398849</PhoneNum>
      <USAddress>
        <AddressLine1Txt>110 N MAIN ST SUITE D-1</AddressLine1Txt>
        <CityNm>CAMDEN</CityNm>
        <StateAbbreviationCd>DE</StateAbbreviationCd>
        <ZIPCd>19934</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>JEREMY KALMBACHER</PersonNm>
      <PersonTitleTxt>PRESIDENT</PersonTitleTxt>
      <PhoneNum>3023398849</PhoneNum>
      <SignatureDt>2022-08-08</SignatureDt>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>JEREMY</PersonFirstNm>
        <PersonLastNm>KALMBACHER</PersonLastNm>
      </PersonFullName>
      <SSN>999009999</SSN>
    </SigningOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>BRIAN STETINA</PreparerPersonNm>
      <PTIN>P00933099</PTIN>
      <PhoneNum>3026744305</PhoneNum>
      <PreparationDt>2022-08-08</PreparationDt>
    </PreparerPersonGrp>
    <TaxYr>2021</TaxYr>
    <BuildTS>2023-04-26 12:10:37Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="3">
    <IRS990EZ documentId="RetDoc1" referenceDocumentId="RetDoc2">
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
      <WebsiteAddressTxt>DSSCDE.ORG</WebsiteAddressTxt>
      <Organization501c3Ind referenceDocumentId="RetDoc3">X</Organization501c3Ind>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>62434</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ProgramServiceRevenueAmt>62434</ProgramServiceRevenueAmt>
      <TotalRevenueAmt>62434</TotalRevenueAmt>
      <FeesAndOtherPymtToIndCntrctAmt>23627</FeesAndOtherPymtToIndCntrctAmt>
      <OccupancyRentUtltsAndMaintAmt>6866</OccupancyRentUtltsAndMaintAmt>
      <OtherExpensesTotalAmt>31887</OtherExpensesTotalAmt>
      <TotalExpensesAmt>62380</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>54</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>139320</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>139374</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>32011</BOYAmt>
        <EOYAmt>14627</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <OtherAssetsTotalDetail>
        <BOYAmt>107309</BOYAmt>
        <EOYAmt>124747</EOYAmt>
      </OtherAssetsTotalDetail>
      <Form990TotalAssetsGrp>
        <BOYAmt>139320</BOYAmt>
        <EOYAmt>139374</EOYAmt>
      </Form990TotalAssetsGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>139320</BOYAmt>
        <EOYAmt>139374</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <PrimaryExemptPurposeTxt>ASSISTS LOW-INCOME, UNDERSERVED COMMUNITIES WITH ENVIRONMENTAL AND INFRASTRUCTURE NEEDS SUCH AS WATER AND WASTEWATER, BROWNFIELDS, STORM WATER, RENEWABLE ENERGY, AND OTHER CONCERNS.</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>RUN WASTEWATER FACILITIES IN LOW POVERTY AREAS.</DescriptionProgramSrvcAccomTxt>
        <ProgramServiceExpensesAmt>55042</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <TotalProgramServiceExpensesAmt>55042</TotalProgramServiceExpensesAmt>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>JEREMY KALMBACHER</PersonNm>
        <TitleTxt>PRESIDENT</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>5.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>ELIO BATISTA</PersonNm>
        <TitleTxt>VP &amp; SECRETA</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>MICHAEL VANDERSLICE</PersonNm>
        <TitleTxt>TREASURER</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>NELLO PAOLI</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>false</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
      <Form1120PolFiledInd>false</Form1120PolFiledInd>
      <MadeLoansToFromOfficersInd>false</MadeLoansToFromOfficersInd>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <BooksInCareOfDetail>
        <PersonNm>JEREMY KALMBAUCHER</PersonNm>
        <USAddress>
          <AddressLine1Txt>738 E PEBWORTH RD</AddressLine1Txt>
          <CityNm>MAGNOLIA</CityNm>
          <StateAbbreviationCd>DE</StateAbbreviationCd>
          <ZIPCd>19962</ZIPCd>
        </USAddress>
        <PhoneNum>3027471327</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SchoolOperatingInd>false</SchoolOperatingInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>true</FiledScheduleAInd>
    </IRS990EZ>
    <IRS990ScheduleA documentId="RetDoc3">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus2YearsAmt>20000</CurrentTaxYearMinus2YearsAmt>
        <TotalAmt>20000</TotalAmt>
      </GiftsGrantsContrisRcvd509Grp>
      <GrossReceiptsAdmissionsGrp>
        <CurrentTaxYearMinus2YearsAmt>44132</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>144476</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>62434</CurrentTaxYearAmt>
        <TotalAmt>251042</TotalAmt>
      </GrossReceiptsAdmissionsGrp>
      <Total509Grp>
        <CurrentTaxYearMinus2YearsAmt>64132</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>144476</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>62434</CurrentTaxYearAmt>
        <TotalAmt>271042</TotalAmt>
      </Total509Grp>
      <PublicSupportTotal509Amt>271042</PublicSupportTotal509Amt>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus2YearsAmt>64132</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>144476</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>62434</CurrentTaxYearAmt>
        <TotalAmt>271042</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <First5Years509Ind>X</First5Years509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleO documentId="RetDoc2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART I, LINE 16</FormAndLineReferenceDesc>
        <ExplanationTxt>EXPENSES OFFICE SUPPLIES 36 COMPUTER &amp; SOFTWARE 140 INSURANCE 8,738 BANK FEES 580 SUPPLIES 22,144 TAXES &amp; LICENSES 249 TOTAL 31,887</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART II, LINE 24</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCOUNTS RECEIVABLE 107,309 124,747 TOTAL 107,309 124,747</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART III</FormAndLineReferenceDesc>
        <ExplanationTxt>ASSISTS LOW-INCOME, UNDERSERVED COMMUNITIES WITH ENVIRONMENTAL AND INFRASTRUCTURE NEEDS SUCH AS WATER AND WASTEWATER, BROWNFIELDS, STORM WATER, RENEWABLE ENERGY, AND OTHER CONCERNS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
