California

It depends on the town. 595 of 660 listed water systems in California, United States are low risk (90.2%).

• 595Low
• 22Medium
• 43High
• 0Critical

• AdelantoLow risk
• Alhambra7 systems · low risk
• AlpineLow risk
• Altadena2 systems · low risk
• American CanyonLow risk
• American O&m, - VsfbLow risk
• Anaheim10 systems · low risk
• Anderson2 systems · includes high risk
• Angels CampMedium risk
• AntiochLow risk
• Apple Valley3 systems · low risk
• ArcadiaLow risk
• ArcataLow risk
• ArmonaLow risk
• ArnoldLow risk
• Arroyo Grande2 systems · low risk
• ArvinHigh risk
• AtascaderoLow risk
• AtwaterLow risk
• Auburn2 systems · low risk
• AvalonLow risk
• AvenalHigh risk
• AzusaLow risk
• Bakersfield5 systems · includes high risk
• Baldwin Park2 systems · low risk
• Banning2 systems · low risk
• BeaumontLow risk
• Bell GardensLow risk
• Bella VistaLow risk
• Bellflower2 systems · low risk
• BelmontLow risk
• BeniciaLow risk
• Bermuda DunesLow risk
• Beverly HillsLow risk
• Big Bear CityLow risk
• Big Bear LakeLow risk
• Big RiverHigh risk
• BishopLow risk
• Blythe2 systems · low risk
• Borrego SpringsLow risk
• Boulder Creek2 systems · high risk
• BrawleyLow risk
• BreaLow risk
• BrentwoodLow risk
• BrisbaneLow risk
• BuelltonLow risk
• Buena ParkLow risk
• BurbankLow risk
• Burlingame3 systems · low risk
• CalabasasLow risk
• CalexicoHigh risk
• California CityLow risk
• CalimesaLow risk
• CalistogaLow risk
• Camarillo3 systems · low risk
• CambriaLow risk
• Camp Pendleton NorthLow risk
• Camp Pendleton SouthLow risk
• CarlsbadLow risk
• CarmichaelLow risk
• CarpinteriaLow risk
• CastaicLow risk
• CastrovilleLow risk
• CeresHigh risk
• CerritosLow risk
• ChicoLow risk
• Chino2 systems · includes high risk
• Chino HillsLow risk
• ChowchillaLow risk
• Chula VistaLow risk
• Citrus HeightsLow risk
• Clearlake2 systems · low risk
• CloverdaleLow risk
• ClovisLow risk
• CoachellaLow risk
• CoalingaLow risk
• CoarsegoldHigh risk
• CobbHigh risk
• ColtonLow risk
• Colusa2 systems · low risk
• ComptonLow risk
• ConcordLow risk
• CorcoranLow risk
• CorningLow risk
• CoronaLow risk
• Corte MaderaLow risk
• Costa MesaLow risk
• CotatiLow risk
• Cottonwood2 systems · includes medium risk
• Covina6 systems · low risk
• Crescent CityLow risk
• Crescenta ValleyLow risk
• CrestlineLow risk
• Cucamonga ValleyLow risk
• Cudahy2 systems · low risk
• CupertinoLow risk
• CutlerHigh risk
• CuttenLow risk
• Daly CityLow risk
• Davis2 systems · low risk
• Del MarLow risk
• Delano2 systems · low risk
• DelhiLow risk
• DenairLow risk
• Desert Hot SpringsLow risk
• DiabloLow risk
• DinubaHigh risk
• Discovery BayLow risk
• DixonLow risk
• Dos PalosMedium risk
• Downey5 systems · low risk
• EarlimartHigh risk
• East Palo AltoLow risk
• El CajonLow risk
• El CentroLow risk
• El Monte3 systems · low risk
• El SegundoLow risk
• El VeranoLow risk
• Elk GroveLow risk
• Encinitas2 systems · low risk
• EscalonLow risk
• Escondido3 systems · low risk
• EspartoLow risk
• EurekaLow risk
• ExeterLow risk
• Fair OaksLow risk
• FairfieldHigh risk
• FallbrookLow risk
• FarmersvilleHigh risk
• FillmoreLow risk
• FirebaughLow risk
• Folsom2 systems · low risk
• Folsom State PrisonHigh risk
• FontanaLow risk
• ForesthillLow risk
• Forestville2 systems · low risk
• Fort BraggHigh risk
• Fort IrwinLow risk
• FortunaLow risk
• Foster CityLow risk
• Fountain ValleyLow risk
• FowlerLow risk
• FremontLow risk
• Fresno2 systems · includes high risk
• FullertonLow risk
• GaltLow risk
• Garden GroveLow risk
• GeorgetownLow risk
• GilroyLow risk
• GlendaleLow risk
• GlendoraLow risk
• GoletaLow risk
• GonzalesLow risk
• Grand TerraceLow risk
• Granite BayLow risk
• Grass Valley6 systems · low risk
• GreenfieldLow risk
• GridleyHigh risk
• Groveland Community ServHigh risk
• Grover BeachLow risk
• GuadalupeLow risk
• Guerneville2 systems · low risk
• GustineHigh risk
• Half Moon BayLow risk
• HanfordLow risk
• Hawthorne2 systems · low risk
• HaywardLow risk
• HealdsburgLow risk
• HeberLow risk
• Helendale CommunityLow risk
• Hemet2 systems · low risk
• HesperiaLow risk
• Hidden Valley LakeLow risk
• HighlandLow risk
• HillsboroughLow risk
• Hilmar CountyMedium risk
• Hollister2 systems · low risk
• HoltvilleLow risk
• Hoopa Valley-wideLow risk
• HughsonHigh risk
• Huntington BeachLow risk
• Huntington Park3 systems · low risk
• HuronMedium risk
• IdyllwildMedium risk
• Imperial3 systems · includes high risk
• Imperial BeachLow risk
• IndioLow risk
• InglewoodLow risk
• IrvineLow risk
• IvanhoeHigh risk
• Jackson2 systems · low risk
• JamestownLow risk
• Joshua TreeLow risk
• Jurupa Valley3 systems · low risk
• KelseyvilleLow risk
• KermanLow risk
• KeyesLow risk
• King George . CourthouseLow risk
• KingsburgLow risk
• La Canada IrrigationLow risk
• La Cañada FlintridgeLow risk
• La HabraLow risk
• La Habra HeightsLow risk
• La MesaLow risk
• La PalmaLow risk
• La Puente2 systems · low risk
• La VerneLow risk
• Laguna Beach2 systems · low risk
• Laguna HillsLow risk
• Lake ArrowheadLow risk
• Lake ElsinoreLow risk
• Lake ForestLow risk
• Lakeport3 systems · low risk
• LakesideLow risk
• LakewoodLow risk
• LamontLow risk
• LathropLow risk
• LebecLow risk
• Lemoore2 systems · includes medium risk
• LincolnLow risk
• LindsayMedium risk
• Live OakLow risk
• LivermoreLow risk
• LivingstonHigh risk
• LockefordLow risk
• LodiLow risk
• Loma LindaLow risk
• LomitaLow risk
• Lompoc3 systems · low risk
• Long BeachLow risk
• Los Altos HillsLow risk
• Los AngelesLow risk
• Los BanosMedium risk
• Los OsosLow risk
• LynwoodLow risk
• Madera3 systems · includes high risk
• Mammoth LakesLow risk
• Manhattan BeachLow risk
• MantecaLow risk
• MarinaLow risk
• MartinezLow risk
• MarysvilleLow risk
• Maywood2 systems · low risk
• McFarlandMedium risk
• McKinleyvilleLow risk
• Meadow VistaLow risk
• Meiners OaksLow risk
• MendotaLow risk
• Menlo ParkLow risk
• MercedLow risk
• MillbraeLow risk
• MilpitasLow risk
• Modesto2 systems · low risk
• MojaveLow risk
• MonroviaLow risk
• MontaraLow risk
• MontclairLow risk
• Montebello4 systems · low risk
• MontecitoLow risk
• Monterey ParkHigh risk
• MoorparkLow risk
• Moreno ValleyLow risk
• Morgan HillLow risk
• Morro BayLow risk
• Mount ShastaHigh risk
• Mountain HouseLow risk
• Mountain ViewLow risk
• MurphysLow risk
• NapaLow risk
• Naval Base Ventura County, Port HuenemeLow risk
• NeedlesLow risk
• NewmanMedium risk
• Newport BeachLow risk
• NipomoLow risk
• NorcoMedium risk
• North GualalaLow risk
• NorwalkLow risk
• NovatoLow risk
• NuevoLow risk
• Oak ViewMedium risk
• OakdaleMedium risk
• OaklandLow risk
• OceanoLow risk
• OceansideLow risk
• Ojai2 systems · includes medium risk
• OlivehurstLow risk
• OntarioLow risk
• Orange2 systems · low risk
• Orange CoveHigh risk
• OrangevaleLow risk
• OrlandLow risk
• OrosiLow risk
• OrovilleLow risk
• Oxnard2 systems · low risk
• Pacific GroveLow risk
• PacificaLow risk
• Pala NorthHigh risk
• Palm Desert2 systems · low risk
• Palm SpringsLow risk
• Palmdale2 systems · low risk
• Palo AltoLow risk
• ParadiseLow risk
• ParamountLow risk
• ParlierHigh risk
• Pasadena2 systems · low risk
• Paso RoblesLow risk
• PattersonLow risk
• PaumaLow risk
• PerrisLow risk
• PetalumaLow risk
• Phelan2 systems · low risk
• Pico Rivera2 systems · low risk
• Pinedale CountyLow risk
• Pismo BeachMedium risk
• PittsburgLow risk
• Placerville2 systems · low risk
• PlanadaHigh risk
• Pleasanton2 systems · low risk
• Plumas LakeLow risk
• PomonaLow risk
• Port HuenemeLow risk
• PortervilleHigh risk
• PowayLow risk
• Psmcsd - PajaroLow risk
• Quartz Hill2 systems · low risk
• QuincyLow risk
• RainbowLow risk
• RamonaLow risk
• Rancho Cordova6 systems · low risk
• Rancho MurietaLow risk
• Rancho Santa FeLow risk
• Red BluffLow risk
• Redding2 systems · low risk
• RedlandsLow risk
• Redwood CityLow risk
• ReedleyLow risk
• Rialto2 systems · low risk
• RidgecrestLow risk
• Rio DellLow risk
• Rio LindaLow risk
• Rio VistaLow risk
• RiponLow risk
• RiverbankLow risk
• Riverside3 systems · low risk
• Rohnert ParkLow risk
• RosamondLow risk
• Rosemead6 systems · low risk
• RosevilleLow risk
• Rowland HeightsLow risk
• Running SpringsLow risk
• Sacramento17 systems · includes high risk
• Saint HelenaLow risk
• SalinasLow risk
• San Andreas4 systems · low risk
• San Bernardino6 systems · low risk
• San BrunoLow risk
• San ClementeLow risk
• San DiegoLow risk
• San Dimas7 systems · low risk
• San FernandoLow risk
• San FranciscoLow risk
• San JacintoLow risk
• San JoaquinLow risk
• San Jose30 systems · low risk
• San Juan CapistranoLow risk
• San Luis Obispo2 systems · low risk
• San MarcosLow risk
• SangerMedium risk
• Santa AnaLow risk
• Santa Barbara2 systems · low risk
• Santa ClaraLow risk
• Santa Clarita Valley AgencyLow risk
• Santa CruzLow risk
• Santa Fe Springs2 systems · low risk
• Santa MargaritaLow risk
• Santa Maria3 systems · low risk
• Santa MonicaLow risk
• Santa PaulaLow risk
• Santa RosaLow risk
• Santa YnezLow risk
• SanteeLow risk
• Scotts ValleyLow risk
• Seal BeachLow risk
• SebastopolLow risk
• ShafterLow risk
• Shasta LakeLow risk
• Shingle SpringsLow risk
• Sierra MadreLow risk
• Signal HillMedium risk
• Simi ValleyLow risk
• Soledad2 systems · low risk
• SolvangLow risk
• SonomaLow risk
• Sonora3 systems · low risk
• SoquelLow risk
• South GateLow risk
• South Lake TahoeLow risk
• South PasadenaLow risk
• South San FranciscoLow risk
• Spring ValleyLow risk
• StanfordLow risk
• Stockton3 systems · low risk
• SunnyvaleLow risk
• Susanville2 systems · low risk
• Sutter Creek2 systems · low risk
• Table Mountain RancheriaLow risk
• TaftLow risk
• Tahoe City - MainLow risk
• Tahoe VistaLow risk
• Tehachapi4 systems · includes high risk
• Temecula2 systems · low risk
• Temescal ValleyLow risk
• TempletonLow risk
• ThermalitoLow risk
• Thousand OaksLow risk
• TorranceLow risk
• Trabuco CanyonLow risk
• TracyLow risk
• Truckee2 systems · low risk
• TulareLow risk
• TurlockLow risk
• TustinLow risk
• Twentynine Palms2 systems · low risk
• Ukiah4 systems · low risk
• Upland2 systems · low risk
• Vacaville3 systems · includes high risk
• VallejoLow risk
• Valley Center2 systems · low risk
• VenturaLow risk
• Vernon-cityLow risk
• VictorvilleLow risk
• Villa ParkLow risk
• VistaLow risk
• WalnutLow risk
• Wasco2 systems · low risk
• WaterfordLow risk
• WatsonvilleLow risk
• WeavervilleMedium risk
• West CovinaLow risk
• West SacramentoHigh risk
• Westlake VillageLow risk
• WestminsterLow risk
• WheatlandLow risk
• Whittier2 systems · low risk
• WildomarLow risk
• WilliamsLow risk
• Willits2 systems · low risk
• WindsorLow risk
• WintersLow risk
• WintonHigh risk
• WoodlakeLow risk
• WoodlandLow risk
• Yocha Dehe PotableLow risk
• Yorba LindaLow risk
• YrekaHigh risk
• Yuba CityLow risk
• Yucaipa2 systems · includes medium risk
• Yucca Valley2 systems · low risk

Covers community water systems serving 3,300 people or more. The rating uses health-based violations of federal drinking-water standards in the last three years, and whether those violations have been fixed. Each system is placed at a town it serves, so positions are approximate.