California tap water quality
2,920 active community water systems.
Largest water systems
Most issues (systems serving 10,000+)
City of Lindsay
City of Norco
Pala North
City of Lemoore
City of McFarland
Signal Hill - City, Water Dept.
Oildale Mwc
Suisun-Solano Water Authority
City of Avenal
California Institution for Men
City of Anaheim Public Utilities
SCWA - Laguna/Vineyard
City of Porterville
City of Ceres
City of Sanger
Riverside Highland Water Company
City of Fresno Water Division
City of Sacramento Department of Utilities
City of Orange
City of Pleasanton
Cities
AcampoActonAdelantoAdinAgoura HillsAguangaAhwahneeAlamedaAlamoAlbanyAlderpointAlhambraAliso ViejoAlleghanyAlpaughAlpineAltadenaAltavilleAlturasAlvisoAmador CityAmerican CanyonAnaheimAndersonAngels CampAngelus OaksAngwinAntelopeAntiochAnzaApple ValleyApplegateAptosArbuckleArcadiaArcataArmonaArnoldAromasArroyo GrandeArtesiaArvinAtascaderoAthertonAtwaterAuberryAuburnAvalonAvenalAveryAvila BeachAzusaBadgerBakerBakersfieldBaldwin ParkBallicoBangorBanningBardBarona North ReservationBarstowBass LakeBaysideBeale AfbBear River - Tish Non VillageBeaumontBell GardensBella VistaBellflowerBelmontBelvedere TiburonBen LomondBeniciaBenton Paiute ReservationBerkeleyBerry CreekBethel IslandBeverly HillsBig Bear CityBig Bear LakeBig CreekBig Oak FlatBig PineBig Pine ReservationBig RiverBig Sandy RancheriaBig SurBiggsBiolaBirds LandingBishopBishop Paiute-Shoshone ReservationBlairsden GraeagleBloomingtonBlue JayBlue LakeBlytheBodegaBodega BayBolinasBonitaBonsallBoonvilleBoronBorrego SpringsBoulder CreekBoulevardBradleyBrandeisBranscombBrawleyBreaBrentwoodBridgeportBrisbaneBrookdaleBrooksBrowns ValleyBrownsvilleBuelltonBuena ParkBurbankBurlingameBurneyButte CityButtonwillowCabazonCalabasasCalexicoCalifornia CityCalifornia Hot SpringsCalimesaCalipatriaCalistogaCallahanCalpineCamarilloCambriaCaminoCamp NelsonCamp PendletonCampbellCampoCampo Indian ReservationCampo SecoCamptonvilleCanbyCanoga ParkCantilCantua CreekCanyonCanyon CountryCanyon DamCapistrano BeachCapitolaCardiff By The SeaCarlsbadCarmelCarmel By The SeaCarmel ValleyCarmichaelCarnelian BayCarpinteriaCarsonCaruthersCasmaliaCasparCasselCastaicCastro ValleyCastrovilleCathedral CityCayucosCazaderoCedar GlenCedarpines ParkCedarvilleCeresCerritosChallengeChatsworthChesterChicoChilcootChinoChino HillsChowchillaChualarChula VistaCitrus HeightsClaremontClaytonClearlakeClearlake OaksClementsClioClipper MillsCloverdaleClovisCoachellaCoalingaCoarsegoldCobbCold Springs RancheriaColevilleColfaxColomaColtonColumbiaColusaComptonConcordCoolCopperopolisCorcoranCorningCoronaCorona Del MarCoronadoCorte MaderaCosta MesaCotatiCottonwoodCoultervilleCourtlandCoveloCovinaCoyoteCrescent CityCrescent MillsCrestlineCrestonCrockettCrows LandingCulver CityCupertinoCutlerCypressDaggettDaly CityDana PointDanvilleDarwinDavisDeath ValleyDeer ParkDel MarDel ReyDelanoDelhiDenairDescansoDesert CenterDesert Hot SpringsDiabloDiamond BarDiamond SpringsDillon BeachDinubaDiscovery BayDixonDobbinsDodgertownDorrisDos PalosDos RiosDouglas CityDowneyDownievilleDrytownDuarteDublinDucorDulzuraDuncans MillsDunniganDunsmuirDurhamDutch FlatEarlimartEarpEast IrvineEast Palo AltoEdwardsEl CajonEl CentroEl CerritoEl DoradoEl Dorado HillsEl GranadaEl MonteEl NidoEl PortalEl SegundoEl SobranteEl ToroEl VeranoEldridgeElkElk CreekElk GroveElmiraElvertaEmeryvilleEmigrant GapEmpireEncinitasEncinoEscalonEscondidoEspartoEtnaEurekaExeterFair OaksFairfaxFairfieldFall River MillsFallbrookFarmersvilleFawnskinFellowsFeltonFerndaleFiddletownFields LandingFillmoreFinleyFirebaughFish CampFive PointsFloristonFolsomFontanaFoothill RanchForest FallsForest KnollsForesthillForestvilleForks Of SalmonFort BidwellFort BraggFort Independence ReservationFort IrwinFort JonesFortunaFountain ValleyFowlerFrazier ParkFreedomFremontFrench CampFresnoFriantFullertonFultonGaltGarbervilleGarden GroveGarden ValleyGardenaGeorgetownGerberGeyservilleGilroyGlen EllenGlencoeGlendaleGlendoraGlenhavenGlennvilleGoletaGonzalesGranada HillsGrand TerraceGranite BayGrass ValleyGratonGreen Valley LakeGreenbraeGreenfieldGreenviewGreenvilleGreenwoodGrenadaGridleyGrimesGrovelandGrover BeachGuadalupeGualalaGuatayGuernevilleGustineHacienda HeightsHalf Moon BayHamilton CityHanfordHarbor CityHathaway PinesHawaiian GardensHawthorneHayforkHaywardHealdsburgHeberHelendaleHelmHemetHerculesHerlongHermosa BeachHesperiaHickmanHidden Valley LakeHighlandHilmarHinkleyHollisterHoltvilleHomelandHomewoodHoodHoopaHoplandHornbrookHowonquet CommunityHughsonHumeHuntington BeachHuntington ParkHuronHydesvilleIdyllwildIgoImperialImperial BeachIndependenceIndian WellsIndioInglewoodInvernessIoneIrvineIsletonIvanhoeJacksonJacumbaJamestownJamulJanesvilleJennerJohannesburgJolonJoshua TreeJulianJune LakeKeelerKeeneKelseyvilleKenwoodKermanKernvilleKettleman CityKeyesKing CityKings BeachKingsburgKirkwoodKlamathKnights LandingKnightsenKorbelKyburzLa Canada FlintridgeLa CrescentaLa GrangeLA HabraLa HondaLa JollaLa MesaLa MiradaLA PalmaLA PuenteLa QuintaLA VerneLadera RanchLafayetteLaguna BeachLaguna HillsLaguna NiguelLaguna WoodsLagunitasLake ArrowheadLake ElsinoreLake ForestLake HughesLake IsabellaLakeheadLakeportLakeshoreLakesideLakewoodLamontLancasterLandersLarkspurLathropLatonLawndaleLaytonvilleLebecLee ViningLemon CoveLemon GroveLemooreLewistonLikelyLincolnLindenLindsayLittle RiverLittlerockLive OakLivermoreLivingstonLlanoLockefordLockhartLockwoodLodiLoletaLoma LindaLoma MarLomitaLompocLone PineLone Pine ReservationLong BeachLoomisLos AlamitosLos AlamosLos AltosLos AngelesLos BanosLos GatosLos MolinosLos OlivosLos OsosLost HillsLotusLower LakeLoyaltonLucerneLucerne ValleyLudlowLynwoodLytle CreekMacdoelMaderaMadisonMagaliaMalibuMammoth LakesManchesterManhattan BeachMantecaMarch Air Reserve BaseMaricopaMarinaMarina Del ReyMariposaMarkleevilleMarshallMartinezMarysvilleMatherMaxwellMaywoodMc FarlandMc KittrickMcarthurMcclellanMcFarlandMckinleyvilleMeadow VistaMeccaMendocinoMendotaMenifeeMenlo ParkMentoneMercedMi Wuk VillageMiddletownMidway CityMilfordMill ValleyMillbraeMillvilleMilpitasMineralMira LomaMiramonteMirandaMission HillsMission ViejoModestoMojaveMokelumne HillMonroviaMontagueMontaraMontclairMonte RioMontebelloMontereyMonterey ParkMontgomery Creek RancheriaMontroseMoorparkMoragaMoreno ValleyMorgan HillMorongo ValleyMorro BayMoss BeachMoss LandingMount BaldyMount HamiltonMount HermonMount LagunaMount ShastaMountain CenterMountain RanchMountain ViewMurphysMurrietaNapaNational CityNeedlesNevada CityNew CuyamaNewarkNewberry SpringsNewbury ParkNewcastleNewhallNewmanNewport BeachNewport CoastNicasioNiceNilandNipomoNiptonNixonNorcoNordenNorth ForkNorth HighlandsNorth HillsNorth HollywoodNorth Palm SpringsNorth San JuanNorthridgeNorwalkNovatoNubieberNuevoO NealsOak ParkOak ViewOakdaleOakhurstOaklandOakleyOccidentalOceanoOceansideOcotilloOjaiOlanchaOld StationOlemaOlivehurstOlympic ValleyOntarioOnyxOrangeOrange CoveOrangevaleOregon HouseOrickOrindaOrlandOrleansOrosiOrovilleOxnardPacific GrovePacific PalisadesPacificaPacoimaPaicinesPalaPalermoPalm DesertPalm SpringsPalmdalePalo AltoPalo CedroPalo VerdePalomar MountainPalos Verdes PeninsulaPanorama CityParadiseParamountParker DamParlierPasadenaPaskentaPaso RoblesPattersonPauma ValleyPaynes CreekPearblossomPebble BeachPenn ValleyPenngrovePenrynPerrisPescaderoPetalumaPhelanPhillipsvillePico RiveraPilot HillPine GrovePine Mountain ClubPinolePinon HillsPioneerPiruPismo BeachPit River TribePittsburgPixleyPlacentiaPlacervillePlanadaPlatinaPlaya Del ReyPlaya VistaPleasant HillPleasantonPlymouthPoint ArenaPoint Mugu NawcPoint Reyes StationPollock PinesPomonaPope ValleyPort CostaPort HuenemePort Hueneme Cbc BasePorter RanchPortervillePortolaPortola ValleyPotreroPowayPratherPrincetonQuail ValleyQuincyRail Road FlatRaisin CityRamonaRanchitaRancho CordovaRancho CucamongaRancho MirageRancho Palos VerdesRancho Santa FeRancho Santa MargaritaRandsburgRaymondRed BluffRed MountainReddingRedlandsRedondo BeachRedwayRedwood CityRedwood ValleyReedleyRepresaRescueResedaRialtoRichgroveRichmondRidgecrestRimforestRio DellRio LindaRio NidoRio VistaRiponRiver PinesRiverbankRiverdaleRiversideRocklinRodeoRohnert ParkRosamondRosemeadRosevilleRossRough And ReadyRound MountainRowland HeightsRunning SpringsRydeSacramentoSaint HelenaSalidaSalinasSalton CitySalyerSamoaSan AndreasSan AnselmoSan ArdoSan Bernardin0San BernardinoSan BrunoSan CarlosSan ClementeSan DiegoSan DimasSan FernandoSan FranciscoSan GabrielSan GeronimoSan GregorioSan JacintoSan JoaquinSan JoseSan Juan BautistaSan Juan CapistranoSan LeandroSan LorenzoSan Luis ObispoSan MarcosSan MarinoSan MartinSan MateoSan PabloSan PedroSan QuentinSan RafaelSan RamonSan SimeonSan YsidroSangerSanta AnaSanta BarbaraSanta ClaraSanta ClaritaSanta CruzSanta Fe SpringsSanta MariaSanta MonicaSanta PaulaSanta RosaSanta Rosa RancheriaSanta YnezSanta YsabelSanteeSaratogaSaugusSausalitoScotts ValleySeal BeachSeasideSebastopolSeeleySelmaSequoia National ParkShafterShandonShastaShasta LakeShasta Lake 4510007SheridanSherman OaksShingle SpringsShingletownShoshoneSierra CitySierra MadreSignal HillSilveradoSimi ValleySkyforestSloughhouseSmartsvilleSmith RiverSoda SpringsSolana BeachSoledadSolvangSomersetSomisSonomaSonoraSoquelSoulsbyvilleSouth Dos PalosSouth El MonteSouth GateSouth Lake TahoeSouth PasadenaSouth San FranciscoSpreckelsSpring ValleySpringvilleSt. HelenaStanfordStantonStevenson RanchStinson BeachStirling CityStocktonStonyfordStratfordStrathmoreStrawberryStudio CitySugarloafSuisun CitySultanaSummerlandSun CitySun ValleySunlandSunnyvaleSunolSunset BeachSurfsideSusanvilleSusanville Upper RancheriaSutcliffeSutterSutter CreekSylmarTable MountainTaftTahoe CityTahoe VistaTarzanaTehachapiTehamaTemeculaTemple CityTempletonTerra BellaThe Sea RanchThermalThorntonThousand OaksThousand PalmsThree RiversTiptonTollhouseTomalesTopangaTopazTorranceTrabuco CanyonTracyTranquillityTraverTravis AfbTrinidadTrinity CenterTronaTruckeeTujungaTulareTule River ReservationTulelakeTuolumneTuolumne Me-Wuk Indan ReservationTupmanTurlockTustinTwainTwain HarteTwentynine PalmsTwin BridgesTwin PeaksUkiahUnion CityUniversal CityUplandUpper LakeVacavilleValenciaVallecitoVallejoValley CenterValley SpringsValley VillageValyermoVan NuysVeniceVenturaVerdugo CityVernalisVernonVictorvilleVidalVilla GrandeVilla ParkVinaVintonVisaliaVistaVolcanoWadsworth, NvWallaceWalnutWalnut CreekWalnut GroveWarner SpringsWascoWashingtonWaterfordWatsonvilleWeavervilleWeedWeimarWeldonWeottWest CovinaWest HillsWest HollywoodWest PointWest SacramentoWestlake VillageWestminsterWestmorlandWestportWestwoodWheatlandWhiskeytownWhitethornWhitewaterWhitmoreWhittierWildomarWilliamsWillitsWillow CreekWillowsWilmingtonWiltonWinchesterWindsorWinnetkaWinterhavenWintersWintonWishonWitter SpringsWofford HeightsWoodacreWoodbridgeWoodlakeWoodlandWoodland HillsWrightwoodYermoYokutsYoloYorba LindaYosemite National ParkYountvilleYrekaYuba CityYucaipaYucca Valley