﻿<?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>2024-10-14T15:17:17-04:00</ReturnTs>
    <TaxPeriodEndDt>2024-06-30</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>942673387</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>CARLSON &amp; ASSOCIATES CPAS INC</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>PO BOX 308</AddressLine1Txt>
        <CityNm>STANDARD</CityNm>
        <StateAbbreviationCd>CA</StateAbbreviationCd>
        <ZIPCd>95373</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-07-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>900863226</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>MULLER MUTUAL WATER COMPANY</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>MULL</BusinessNameControlTxt>
      <USAddress>
        <AddressLine1Txt>P O BOX 716</AddressLine1Txt>
        <CityNm>TUOLUMNE</CityNm>
        <StateAbbreviationCd>CA</StateAbbreviationCd>
        <ZIPCd>95379</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>TONY KRIEG</PersonNm>
      <PersonTitleTxt>PRESIDENT</PersonTitleTxt>
      <PhoneNum>2099281925</PhoneNum>
      <SignatureDt>2024-10-14</SignatureDt>
    </BusinessOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>false</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>ROBERT C HAFF</PreparerPersonNm>
      <PTIN>P01269249</PTIN>
      <PhoneNum>2095325171</PhoneNum>
      <PreparationDt>2024-10-14</PreparationDt>
    </PreparerPersonGrp>
    <TaxYr>2023</TaxYr>
    <BuildTS>2024-10-15 13:58:12Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="2">
    <IRS990EZ documentId="RetDoc2" referenceDocumentId="RetDoc3">
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
      <WebsiteAddressTxt>N/A</WebsiteAddressTxt>
      <Organization501cInd organization501cTypeTxt="12">X</Organization501cInd>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>156999</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>112438</ContributionsGiftsGrantsEtcAmt>
      <ProgramServiceRevenueAmt>41820</ProgramServiceRevenueAmt>
      <InvestmentIncomeAmt>2741</InvestmentIncomeAmt>
      <TotalRevenueAmt>156999</TotalRevenueAmt>
      <FeesAndOtherPymtToIndCntrctAmt>900</FeesAndOtherPymtToIndCntrctAmt>
      <OtherExpensesTotalAmt>177695</OtherExpensesTotalAmt>
      <TotalExpensesAmt>178595</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>-21596</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>98827</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>77231</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>92107</BOYAmt>
        <EOYAmt>71595</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <OtherAssetsTotalDetail>
        <BOYAmt>6998</BOYAmt>
        <EOYAmt>5636</EOYAmt>
      </OtherAssetsTotalDetail>
      <Form990TotalAssetsGrp>
        <BOYAmt>99105</BOYAmt>
        <EOYAmt>77231</EOYAmt>
      </Form990TotalAssetsGrp>
      <SumOfTotalLiabilitiesGrp>
        <BOYAmt>278</BOYAmt>
      </SumOfTotalLiabilitiesGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>98827</BOYAmt>
        <EOYAmt>77231</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <PrimaryExemptPurposeTxt>WATER SUPPLY</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>WATER SUPPLY</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>TONY KRIEG</PersonNm>
        <TitleTxt>PRESIDENT</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</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>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <BooksInCareOfDetail>
        <PersonNm>SHERRY KRIEG</PersonNm>
        <USAddress>
          <AddressLine1Txt>P O BOX 716</AddressLine1Txt>
          <CityNm>TUOLUMNE</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>95379</ZIPCd>
        </USAddress>
        <PhoneNum>2099281925</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>
    </IRS990EZ>
    <IRS990ScheduleO documentId="RetDoc3">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART I, LINE 16</FormAndLineReferenceDesc>
        <ExplanationTxt>EXPENSES OFFICE EXPENSE 660 INSURANCE 4,075 CONTRACT LABOR 11,763 PO BOX RENT 166 REPAIRS &amp; MAINTENANCE 1,247 STATE WATER RESOURCES 601 SWRB GRANT EXPENSES 133,207 TAXES 4,023 UTILITIES 49 WATER EXPENSE 18,128 WATER TESTING 2,910 NON-INVESTMENT DEPRECIATION 866 TOTAL 177,695</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART II, LINE 24</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCOUNTS RECEIVABLE 6,132 5,636 EQUIPMENT 54,709 54,709 LESS ACCUMULATED DEPRECIATION 53,843 54,709 TOTAL 6,998 5,636</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART II, LINE 26</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCOUNTS PAYABLE AND ACCRUED EXPENSES 278 0</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>