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CA tap water quality, city by city
955 cities and towns in CA are served by an active community water system in the EPA's records. Each page below translates that system's EPA-reported history into plain English.
According to EPA SDWIS data, retrieved June 2026.
- Acampo
- Adelanto
- Agoura Hills
- Agua Dulce
- Aguanga
- Alamo
- Albion
- Alderpoint
- Alhambra
- Alleghany
- Alpaugh
- Alpine
- Alpine
- Alpine Meadows
- Altadena
- Alturas
- American Canyon
- Anaheim
- Anderson
- Angels Camp
- Angelus Oaks
- Angwin
- Antioch
- Anza
- Anza
- Apple Valley
- Applegate
- Aptos
- Arbuckle
- Arcadia
- Arcata
- Armona
- Arnold
- Aromas
- Arrowbear Lake
- Arroyo Grande
- Artesia
- Artois
- Arvin
- Atascadero
- Atwater
- Auberry
- Auberry
- Auburn
- Avalon
- Avenal
- Avila Beach
- Azusa
- Badger
- Baker
- Bakersfield
- Baldwin Park
- Ballico
- Banning
- Banning
- Barstow
- Beale Afb
- Bear Valley
- Beaumont
- Bell Canyon
- Bella Vista, Ca
- Bellflower
- Belmont
- Ben Lomond
- Benicia
- Benton
- Bermuda Dunes
- Berry Creek
- Bethel Island
- Bethel Island Rd
- Beverly Hills
- Bevery Hills
- Bieber
- Big Bear City
- Big Bear Lake
- Big Creek
- Big Pine
- Big Pine
- Big Sur
- Biggs
- Biola
- Bishop
- Bishop
- Blairsden
- Bloomington
- Blue Jay
- Blue Lake
- Blythe
- Bodega
- Bodega Bay
- Bodfish
- Bolinas
- Bonita
- Boonville
- Boron
- Borrego Springs
- Boulder Creek
- Boulevard
- Bradley
- Brawley
- Brea
- Brentwood
- Bridgeport
- Bridgeville
- Brisbane
- Brooks
- Brownsville
- Buellton
- Buena Park
- Burbank
- Burlingame
- Burney
- Burney
- Burnt Ranch
- Butte City
- Butte Meadows
- Buttonwillow
- Cabazon
- Calabasas
- Calexico
- California City
- Calimesa
- Calistoga
- Callahan
- Calpine
- Camarillo
- Cambria
- Camp Meeker
- Camp Pendleton
- Campbell
- Campo
- Campo
- Camptonville
- Canby
- Cantil
- Canyon
- Carlsbad
- Carmel
- Carmel Valley
- Carmichael
- Carnelian Bay
- Carpinteria
- Caruthers
- Casitas Springs
- Casmalia
- Cassel
- Castaic
- Castro Valley
- Castroville
- Cayucos
- Cazadero
- Cedar Glen
- Cedarpines Park
- Cedarville
- Ceres
- Cerritos
- Cherry Valley
- Chester
- Chico
- China Lake
- Chino
- Chino Hills
- Chiriaco Summit
- Chowchilla
- Chualar
- Chula Vista
- Citrus Heights
- City Of Colusa
- Claremont
- Clayton
- Clearlake
- Clearlake Oak
- Clio
- Clipper Mills
- Cloverdale
- Clovis
- Coachella
- Coachella
- Coalinga
- Coarsegold
- Cobb
- Cold Springs
- Coleville
- Colfax
- Colton
- Columbia
- Colusa
- Colusa
- Compton
- Concord
- Corcoran
- Corning
- Corona
- Corona Del Mar
- Corral De Tierra
- Corralitos
- Corte Madera
- Costa Mesa
- Cotati
- Cottonwood
- Courtland
- Covelo
- Covina
- Coyote
- Crescent City
- Crestline
- Crowley Lake
- Crows Landing
- Cudahy
- Cutler
- Cutten
- Daggett
- Daly City
- Dana Point
- Danville
- Darwin
- Davis
- Death Valley
- Del Mar
- Del Rey
- Delano
- Delhi
- Denair
- Desert Center
- Desert Hot Springs
- Devore
- Diamond Springs
- Dillon Beach
- Dinuba
- Discovery Bay
- Dixon
- Dobbins
- Dorris
- Dos Palos
- Downey
- Downieville
- Ducor
- Duncans Mills
- Dunsmuir
- Durham
- Earlimart
- Earp
- East Palo Alto
- East Vale
- Edison
- Edwards Afb
- El Cajon
- El Centro
- El Dorado Hills
- El Monte
- El Segundo
- El Verano
- Eldorado Hills
- Elizabeth Lake
- Elk
- Elk Creek
- Elk Creek
- Elk Grove
- Elmira
- Elverta
- Emigrant Gap
- Encinitas
- Encino
- Escalon
- Escondido
- Esparto
- Etna
- Eureka
- Exeter
- Fair Oaks
- Fairfield
- Fall River Mills
- Fallbrook
- Farmersville
- Farmington
- Fawnskin
- Felton
- Ferndale
- Fiddletown
- Fillmore
- Firebaugh
- Five Points
- Floriston
- Folsom
- Fontana
- Forest Falls
- Forest Ranch
- Foresthill
- Forestville
- Forsest Ranch
- Fort Bidwell
- Fort Bragg
- Fort Hunter Liggett
- Fort Irwin
- Fort Jones
- Fort Jones
- Fortuna
- Foster City
- Fountain Valley
- Fowler
- Frazier Park
- Freedom
- Fremont
- French Camp
- Fresno
- Friant
- Friant
- Fullerton
- Fulton
- Galt
- Garberville
- Garden Grove
- Gasquet
- Gaviota
- Georgetown
- Gerber
- Geyserville
- Gilroy
- Glen Ellen
- Glendale
- Glendora
- Glenhaven
- Glennville
- Gold River
- Goleta
- Gonzales
- Gorman
- Graeagle
- Grand Terrace
- Granite Bay
- Grass Valley
- Graton
- Greeley Hill
- Green Valley
- Green Valley Lake
- Greenbrae
- Greenfield
- Greenville
- Grenada
- Gridley
- Grimes
- Grizzly Flats
- Groveland
- Grover Beach
- Guadalupe
- Gualala
- Guatay
- Guerneville
- Gustine
- Halcyon
- Half Moon Bay
- Hanford
- Happy Camp
- Havasu Lake
- Hawthorne
- Hayfork
- Hayward
- Healdsburg
- Heber
- Helendale
- Helm
- Hemet
- Hercules
- Herlong
- Hermosa Beach
- Hesperia
- Hickman
- Hidden Valley Lake
- Highland
- Hillsborough
- Hilmar
- Hollister
- Holtville
- Hoopa
- Hopland
- Hornbrook
- Hughson
- Hume
- Huntington Beach
- Huntington Park
- Huron
- Hydesville
- Idyllwild
- Imperial
- Imperial Beach
- Independence
- Independence
- Indio
- Indio
- Inglewood
- Inverness
- Inyokern
- Ione
- Irvine
- Irvine
- Isleton
- Ivanhoe
- Jackson
- Jacumba
- Jamestown
- Jamul
- Jenner
- Johanesburg
- Jose
- Joshua Tree
- Julian
- Junction City
- June Lake
- Jurupa Valley
- Keene
- Kelseyville
- Kenwood
- Kerman
- Kernville
- Kettleman City
- Keyes
- King City
- King George
- Kingsburg
- Kirkwood
- Klamath
- Klamath
- Knights Ferry
- Korbel
- Kyburz
- La Canada
- La Canada Flintridge
- La Crescenta
- La Grange
- La Habra
- La Habra Heights
- La Honda
- La Jolla
- La Mesa
- La Palma
- La Puente
- La Selva Beach
- La Verne
- Ladera Ranch
- Lafayette
- Laguna Beach
- Laguna Hills
- Lake Almanor
- Lake Arrowhead
- Lake Arrowhead Ca 92352
- Lake Elsinore
- Lake Forest
- Lake Hughes
- Lake Isabella
- Lake Of The Woods
- Lakehead
- Lakeport
- Lakeport
- Lakeside
- Lakeside
- Lakewood
- Lamont
- Lancaster
- Larkspur
- Lathrop
- Laton
- Laytonville
- Le Grand
- Lebec
- Lee Vining
- Lemon Cove
- Lemoore
- Lemoore
- Lincoln
- Linden
- Lindsay
- Little Valley
- Littlerock
- Live Oak
- Livermore
- Livingston
- Llano
- Lockeford
- Lockwood
- Lodi
- Loleta
- Loleta
- Loma Linda
- Loma Mar
- Lomita
- Lompoc
- Lone Pine
- Lone Pine
- Long Barn
- Long Beach
- Loomis
- Los Alamos
- Los Altos
- Los Altos Hills
- Los Angeles
- Los Banos
- Los Gatos
- Los Moliinos
- Los Molinos
- Los Olivos
- Los Osos
- Lost Hills
- Lower Lake
- Loyalton
- Lucerne Valley
- Ludlow
- Lynwood
- Lytle Creek
- Macdoel
- Madera
- Madison
- Mammoth Lakes
- Manchester
- Manhattan Beach
- Manteca
- Marina
- Marina Del Ray
- Marina Del Rey
- Mariposa
- Markleeville
- Martinez
- Marysville
- Mather
- Maxwell
- Maywood
- Mccloud
- Mcfarland
- Mckinleyville
- Meadow Vista
- Mecca
- Mendocino
- Mendota
- Menlo Park
- Mentone
- Merced
- Mi Wuk Village
- Mi-Wuk Village
- Middletown
- Middletown
- Midway City
- Milford
- Millbrae
- Milpitas
- Mineral
- Mira Loma
- Miramonte
- Miranda
- Modesto
- Moffett Field
- Mojave
- Monrovia
- Montague
- Montara
- Montclair
- Montebello
- Monteray
- Monterey
- Monterey Park
- Moorpark
- Moraga
- Moreno Valley
- Morgan Hill
- Morgann Hill
- Morro Bay
- Moss Landing
- Mount Baldy
- Mount Hamilton
- Mount Hermon
- Mountain Center
- Mountain House
- Mountain Pass
- Mountain View
- Mt Laguna
- Mt. Baldy
- Mt. Hamilton
- Mt. Shasta
- Muir Beach
- Muphys
- Murphys
- Murrieta
- Myers Flat
- Napa
- Needles
- Needles
- Nevada City
- New Cuyama
- Newberry Springs
- Newcastle
- Newhall
- Newman
- Newport Beach
- Nicasio
- Nice
- Nipomo
- Nixon
- Norco
- North Edwards
- North Fork
- North Highlands
- North San Juan
- Norwalk
- Novato
- Nuevo
- Oak View
- Oakdale
- Oakhurst
- Oakland
- Oakley
- Occidental
- Oceano
- Oceanside
- Ocotillo
- Ojai
- Old Station
- Olivehurst
- Olympic Valley
- Ontario
- Orange
- Orange Cove
- Orangevale
- Orcutt
- Oregon House
- Orick
- Orinda
- Orland
- Orleans
- Orosi
- Oroville
- Oxnard
- Pacific Grove
- Pacifica
- Paicines
- Pala
- Palm Desert
- Palm Springs
- Palmdale
- Palo Alto
- Palo Cedro
- Palo Verde
- Palomar Mountain
- Palos Verdes Estates
- Paradise
- Paramount
- Parlier
- Pasadena
- Paskenta
- Paso Robles
- Patterson
- Pauma Valley
- Pauma Valley
- Paynes Creek
- Penn Valley
- Penngrove
- Perris
- Pescadero
- Petaluma
- Phelan
- Phillipsville
- Pico Rivera
- Piedra
- Pine Grove
- Pine Mountain Club
- Pine Valley
- Pinecrest
- Pinedale
- Pismo Beach
- Pittsburg
- Pixley
- Placentia
- Placerville
- Planada
- Platina
- Pleasant Hill
- Pleasanton
- Plumas Lake
- Plymouth
- Point Arena
- Point Arena
- Point Mugu
- Point Reyes Station
- Pomona
- Poplar
- Port Hueneme
- Porterville
- Porterville
- Portola
- Poway
- Prather
- Princeton
- Prunedale
- Quartz Hill
- Quincy
- Railroad Flat
- Ramona
- Rancho Cordova
- Rancho Cucamonga
- Rancho Mission Viejo
- Rancho Murieta
- Rancho Santa Fe
- Rancho Santa Margarita
- Rancho Sante Fe
- Red Bluff
- Redding
- Redding
- Redlands
- Redondo Beach
- Redway
- Redwood City
- Redwood Valley
- Redwood Valley
- Reedley
- Represa
- Rescue
- Rialto
- Richardson Springs
- Richgrove
- Ridgecrest
- Rio Dell
- Rio Linda
- Rio Vista
- Ripon
- River Pines
- Riverbank
- Riverdale
- Riverside
- Rocklin
- Rohnert Park
- Romoland
- Rosamond
- Rosemead
- Roseville
- Rowland Heights
- Royal Oaks
- Running Springs
- Sacramento
- Salinas
- Salyer
- San Andreas
- San Ardo
- San Bernardino
- San Bruno
- San Clemente
- San Diego
- San Dimas
- San Fernando
- San Francisco
- San Jacinto
- San Jacinto
- San Joaquin
- San Jose
- San Juan Bautista
- San Juan Capistrano
- San Leandro
- San Lucas
- San Luis Obispo
- San Marcos
- San Marino
- San Martin
- San Mateo
- San Miguel
- San Ramon
- San Simeon
- San Ysabel
- Sanger
- Santa Ana
- Santa Barbara
- Santa Clara
- Santa Clarita
- Santa Cruz
- Santa Fe Springs
- Santa Maria
- Santa Monica
- Santa Nella
- Santa Paula
- Santa Rosa
- Santa Rosa
- Santa Ynez
- Santa Ysabel
- Santa Ysabel
- Santee
- Saratoga
- Saratosa
- Saugus
- Sausalito
- Scotia
- Scotts Valley
- Sea Ranch
- Seal Beach
- Seaside
- Sebastopol
- Seeley
- Selma
- Shafter
- Shasta
- Shasta Lake
- Shaver Lake
- Sherman Oaks
- Shingle Springs
- Shingletoown
- Shingletown
- Shoshone
- Sierra Madre
- Sierraville
- Signal Hill
- Simi Valley
- Sky Forest
- Skyforest
- Smith River
- Smith River
- Snelling
- Soda Springs
- Soledad
- Solvang
- Somerset
- Sonoma
- Sonora
- Soquel
- Soulsbyville
- South Gate
- South Lake Tahoe
- South Pasadena
- South San Francisco
- Spring Valley
- Springville
- St. Helena
- Standard
- Stanford
- Stinson Beach
- Stockton
- Strathmore
- Studio City
- Suisun City
- Sultana
- Summerland
- Sunnyvale
- Susanville
- Susanville
- Sutter
- Sutter Creek
- Taft
- Tahoe City
- Tahoe Vista
- Talmage
- Tehachapi
- Tehama
- Temecula
- Temecula
- Temescal Valley
- Templeton
- Terra Bella
- Thermal
- Thermal
- Thousand Oaks
- Three Rivers
- Tipton
- Tollhouse
- Tomales
- Toms Place
- Torrance
- Trabuco Canyon
- Tracy
- Tranquillity
- Tres Pinos
- Trinidad
- Trinity Center
- Trinty Center
- Trona
- Truckee
- Tujunga
- Tulare
- Tulelake
- Tuolumne
- Tuolumne
- Turlock
- Tustin
- Twain
- Twain Harte
- Twentynine Palms
- Twin Peaks
- Ukiah
- Upland
- Upper Lake
- Upper Lake
- Vacaville
- Valencia
- Vallejo
- Valley Center
- Valley Center
- Valley Ford
- Valley Springs
- Valley Village
- Valyermo
- Vandenberg Sfb
- Ventura
- Vernon
- Victorville
- Villa Park
- Vina
- Vinton
- Visalia
- Vista
- Volcano
- Walnut
- Walnut Creek
- Walnut Grove
- Warner Springs
- Warner Springs
- Wasco
- Washington
- Waterford
- Watsonville
- Weaverville
- Weed
- Weldon
- Weott
- West Covina
- West Hollyhood
- West Hollywood
- West Point
- West Sacramento
- Westlake Village
- Westminster
- Westmorland
- Westport
- Westwood
- Wheatland
- Whitethorn
- Whittier
- Whittier
- Wildomar
- Williams
- Willits
- Willits
- Willow Creek
- Wilton
- Windsor
- Windsor
- Winterhaven
- Winters
- Winton
- Wishon
- Wofford Heights
- Woodbridge
- Woodlake
- Woodland
- Woody
- Yermo
- Yorba Linda
- Yosemite Np
- Yountville
- Yreka
- Yuba City
- Yucaipa
- Yucca Valley
- Zamora