<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" returnVersion="2023v5.0">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2024-05-12T14:05:40-04:00</ReturnTs>
    <TaxPeriodEndDt>2023-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>043305273</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>KATHLEEN WINSTON CPA</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>118 BARTON DR</AddressLine1Txt>
        <CityNm>SUDBURY</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>01776</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>043170604</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>HOP BROOK PROTECTION ASSOC INC</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>HOPB</BusinessNameControlTxt>
      <PhoneNum>9784432589</PhoneNum>
      <USAddress>
        <AddressLine1Txt>PO BOX 707</AddressLine1Txt>
        <CityNm>SUDBURY</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>01776</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>KATHLEEN WINSTON</PersonNm>
      <PersonTitleTxt>CLERK/SECRETARY</PersonTitleTxt>
      <PhoneNum>9784432589</PhoneNum>
      <SignatureDt>2024-05-12</SignatureDt>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>KATHLEEN</PersonFirstNm>
        <PersonLastNm>WINSTON</PersonLastNm>
      </PersonFullName>
      <SSN>XXX-XX-XXXX</SSN>
    </SigningOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>true</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>KATHLEEN WINSTON</PreparerPersonNm>
      <PTIN>P00147725</PTIN>
      <PhoneNum>9784432589</PhoneNum>
      <PreparationDt>2024-05-12</PreparationDt>
      <SelfEmployedInd>X</SelfEmployedInd>
    </PreparerPersonGrp>
    <TaxYr>2023</TaxYr>
    <BuildTS>2023-04-26 12:10:37Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="3">
    <IRS990EZ documentId="RetDoc1" referenceDocumentId="RetDoc2">
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
      <WebsiteAddressTxt>WWW.HOPBROOK.ORG</WebsiteAddressTxt>
      <Organization501c3Ind referenceDocumentId="RetDoc3">X</Organization501c3Ind>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>7859</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>4988</ContributionsGiftsGrantsEtcAmt>
      <InvestmentIncomeAmt>2871</InvestmentIncomeAmt>
      <TotalRevenueAmt>7859</TotalRevenueAmt>
      <PrintingPublicationsPostageAmt>303</PrintingPublicationsPostageAmt>
      <OtherExpensesTotalAmt>6177</OtherExpensesTotalAmt>
      <TotalExpensesAmt>6480</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>1379</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>71349</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>72728</NetAssetsOrFundBalancesEOYAmt>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>71349</BOYAmt>
        <EOYAmt>72728</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <Form990TotalAssetsGrp>
        <BOYAmt>71349</BOYAmt>
        <EOYAmt>72728</EOYAmt>
      </Form990TotalAssetsGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>71349</BOYAmt>
        <EOYAmt>72728</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <PrimaryExemptPurposeTxt>ENVIRONMENTAL PROTECTION</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>CITIZEN ACTION - AS OF THE CORPORATION'S ANNUAL MEETING IN APRIL, 2022, THE CITY OF MARLBORO IS CURRENT WITH THEIR REQUIREMENTS AS PUT FORTH BY THE EPA.</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>POND REMEDIATION STEPS: CHANGED VENDORS FOR TREATMENT DUE TO INEFFECTIVE TREATMENT IN 2021. TREAT PONDS FOR INVASIVE WATER CHESTNUT WITH CLEARCAST HERBICIDE. TREATMENT DEEMED EFFECTIVE. RECEIVE REIMBURSEMENT FROM TOWN OF SUDBURY FOR 41,415 FOR CURRENT YEAR TREATMENT. CONDUCT FURTHER WATER SAMPLING TO DETERMINE SOURCES OF PHOSPHORUS.</DescriptionProgramSrvcAccomTxt>
        <ProgramServiceExpensesAmt>1545</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>FINDING A PERMANENT SOLUTION - WE ARE PROCEEDING WITH THE DEVELOPMENT OF A WATERSHED BASED PLAN (WBP) TO IDENTIFY THE ISSUES AND COSTS FOR VARIOUS OPTIONS TO RESTORE THE HOP BROOK POND SYSTEM TO A RECREATIONAL CLASS B WATERWAY. WE HAVE SELECTED A VENDOR WITH THE ASSISTANCE OF OARS AND HAVE APPLIED TO CPC FOR GRANT MONEY TO DEVELOP THE WBP.</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <TotalProgramServiceExpensesAmt>1545</TotalProgramServiceExpensesAmt>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>JEFF WINSTON</PersonNm>
        <TitleTxt>PRESIDENT</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>KATHLEEN WINSTON</PersonNm>
        <TitleTxt>CLERK/SECRET</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>KATHLEEN WINSTON</PersonNm>
        <TitleTxt>TREASURER</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>RICK BOOTH</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>TERRY SNYDER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>GLENN PRANSKY</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>ELYSE RAYNEY</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>CHRIS MORAN</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>LORI MORAN</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>SHANNON HACHE</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.50</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>
      <StatesWhereCopyOfReturnIsFldCd>MA</StatesWhereCopyOfReturnIsFldCd>
      <BooksInCareOfDetail>
        <PersonNm>KATHLEEN WINSTON</PersonNm>
        <USAddress>
          <AddressLine1Txt>118 BARTON DR</AddressLine1Txt>
          <CityNm>SUDBURY</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>01776</ZIPCd>
        </USAddress>
        <PhoneNum>9784432589</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>
        <CurrentTaxYearMinus4YearsAmt>15840</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>5775</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>66680</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>53747</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>4988</CurrentTaxYearAmt>
        <TotalAmt>147030</TotalAmt>
      </GiftsGrantsContrisRcvd509Grp>
      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>15840</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>5775</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>66680</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>53747</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>4988</CurrentTaxYearAmt>
        <TotalAmt>147030</TotalAmt>
      </Total509Grp>
      <PublicSupportTotal509Amt>147030</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
        <CurrentTaxYearMinus4YearsAmt>1410</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>541</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>287</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>279</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2871</CurrentTaxYearAmt>
        <TotalAmt>5388</TotalAmt>
      </GrossInvestmentIncome509Grp>
      <InvestmentIncomeAndUBTIGrp>
        <CurrentTaxYearMinus4YearsAmt>1410</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>541</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>287</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>279</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2871</CurrentTaxYearAmt>
        <TotalAmt>5388</TotalAmt>
      </InvestmentIncomeAndUBTIGrp>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>17250</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>6316</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>66967</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>54026</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>7859</CurrentTaxYearAmt>
        <TotalAmt>152418</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.96460</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.97830</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.04000</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.02000</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleO documentId="RetDoc2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART I, LINE 16</FormAndLineReferenceDesc>
        <ExplanationTxt>EXPENSES SUPPLIES 600 INTERNET &amp; WEB 192 DIRECTORS &amp; OFFICERS INSURANC 659 LIABILITY INSURANCE 3,360 WORKMENS COMP INSURANCE 226 TAX FILING FEES 50 POND REMEDIATION EXPENSES 945 DUES 125 OTHER 20 TOTAL 6,177</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART III, LINE 29</FormAndLineReferenceDesc>
        <ExplanationTxt>POND REMEDIATION STEPS: CHANGED VENDORS FOR TREATMENT DUE TO INEFFECTIVE TREATMENT IN 2021. TREAT PONDS FOR INVASIVE WATER CHESTNUT WITH CLEARCAST HERBICIDE. TREATMENT DEEMED EFFECTIVE. RECEIVE REIMBURSEMENT FROM TOWN OF SUDBURY FOR 41,415 FOR CURRENT YEAR TREATMENT. CONDUCT FURTHER WATER SAMPLING TO DETERMINE SOURCES OF PHOSPHORUS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART III, LINE 30</FormAndLineReferenceDesc>
        <ExplanationTxt>FINDING A PERMANENT SOLUTION - WE ARE PROCEEDING WITH THE DEVELOPMENT OF A WATERSHED BASED PLAN (WBP) TO IDENTIFY THE ISSUES AND COSTS FOR VARIOUS OPTIONS TO RESTORE THE HOP BROOK POND SYSTEM TO A RECREATIONAL CLASS B WATERWAY. WE HAVE SELECTED A VENDOR WITH THE ASSISTANCE OF OARS AND HAVE APPLIED TO CPC FOR GRANT MONEY TO DEVELOP THE WBP.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
