Regulated Water Utilities in California

Class A Water Companies:

More than 10,000 service connections

  • California American Water
  • Coronado (HQ); Service Areas: Los Angeles, Monterey, Placer, Sacramento, San Diego, Sonoma, Ventura and Yolo Counties)
  • California Water Service Company San Jose (HQ); Service Areas/Districts: Antelope Valley, East Los Angeles, Rancho Dominguez, Westlake, (Los Angeles County); Bakersfield, Kern River Valley (Kern County); Bayshore, Bear Gulch (San Mateo County); Chico, Oroville (Butte County); Dixon (Solano County); King City, Salinas (Monterey County); Livermore (Alameda County); Los Altos (Santa Clara County); Marysville (Yuba County); Redwood Valley (Sonoma and Lake Counties); Selma (Fresno County); Visalia (Tulare County); Stockton (San Joaquin); Willows (Glenn County)
  • Golden State Water Company San Dimas (Contra Costa, Imperial, Lake, Los Angeles, Orange, Sacramento, San Bernardino, San Luis Obispo, Santa Barbara and Ventura Counties)
  • Great Oaks Water Company San Jose (Santa Clara County)
  • Liberty Utilities Apple Valley (San Bernardino County) and Downey (Los Angeles County)
  • San Gabriel Valley Water Company El Monte (Los Angeles and San Bernardino Counties)
  • San Jose Water Company San Jose (Santa Clara County)
  • Suburban Water Systems Covina (Los Angeles and Orange Counties)

Class B Water Companies:

2,000-10,000 service connections

Class C Water Companies:

500-2,000 Service Connections

  • Agate Bay Water Company Carmichael (Placer County) (Agate Bay, northwest shore of Lake Tahoe)
  • Bass Lake Water Company Bass Lake (Madera County)
  • Big Basin Water Co., Inc. Santa Cruz (Santa Cruz County)
  • Catalina Water Division, Southern California Edison Company Santa Catalina Island (Los Angeles County)
  • Erskine Creek Water Company Lake Isabella (Kern County)
  • Fulton Water Company Tahoe City (Placer County)
  • Graeagle Water Company, Inc. Graeagle (Plumas County)
  • Hillview Water Company Oakhurst (Madera County)
  • Little Bear Water Company King City (Monterey County)
  • Lukins Brothers Water Company South Lake Tahoe (El Dorado County)
  • Meadowbrook Water Co. of Merced, Inc. Merced (Merced County)
  • Mesa-Crest Water Company La Canada (Los Angeles County)
  • Nacimiento Water Company Bradley (San Luis Obispo County)
  • North Gualala Water Works Gualala (Mendocino County)
  • Penngrove Water Company Santa Rosa (Sonoma County)
  • Rio Plaza Water Company, Inc. Moorepark (Ventura County)
  • Rogina Water Company, Inc. Talmage (Mendocino County)
  • Rural Water, Inc. Grover Beach (San Luis Obispo County)
  • Sea Ranch Water Company The Sea Ranch (Sonoma County)
  • Searles Domestic Water Company Trona (San Bernardino County)
  • Southern California Edison Company Santa Catilina Island (Los Angeles County)
  • Tahoe Cedars Water Company Tahoma (El Dorado and Placer Counties)
  • Tahoe Park Water Company, Inc. Tahoe City (Placer County)
  • Yosemite Spring Park Utility Co. Coarsegold (Madera County)

Class D Water Companies:

Less than 500 Service Connections

  • Alpine Village Water Company Porterville (Tulare County)
  • Arroyo Center Water Co., Inc. Greenfield (Monterey County)
  • Baycliff Subdivision Lower Lake (Lake County)
  • Beasore Meadows Water System Oakhurst (Madera County)
  • Benbow Water Corporation Garberville (Humboldt County)
  • Black Butte Water Co. Orland (Glenn County)
  • California Hot Springs Water Serv. California Hot Springs (Tulare County)
  • Canada Woods Water Company Salinas (Monterey County)
  • Casmite Corporation Casmalia Subdivision (Santa Barbara County)
  • Cazadero Water Company Cazadero (Sonoma County)
  • Central Camp Water Inc. Friant (Madera County)
  • Cobb Mountain Water Company Cobb (Lake County)
  • Cold Springs Water Company, Inc. Cold Springs (Tuolumne County)
  • Cottage Springs Water Company Avery (Calaveras County)
  • Dunnigan Water Works Dunnigan (Yolo County)
  • Easton Estates Water Company Fresno (Fresno County)
  • Foothill Ditch Company Exeter (Tulare County)
  • Geyserville Water Works Geyserville (Sonoma County)
  • Goodyears Bar Water Company Sacramento (Sierra County)
  • Hat Creek Water Company Old Station (Shasta County)
  • Havasu Water Company, Inc. Havasu Landing (San Bernardino County)
  • Idylwild Water System Los Gatos (Santa Clara County)
  • Interstate 5 Utility Company, Inc. Bakersfield (Kern County)
  • January Water Company Tulare (Tulare County)
  • Keene Water System Keene, Woodford (Kern County)
  • Kenwood Village Water Company Santa Rosa (Sonoma County)
  • Lake Alpine Water Company, Inc. Bear Valley (Alpine County)
  • Lakeview Water Company Havasu Landing (San Bernardino County)
  • Larkspur Meadows Water Company Paramount (Tehama County)
  • Las Flores Water Works Gerber (Tehama County)
  • Lewiston Valley Water Co., Inc. Lewiston (Trinity County)
  • Little Bear Water, Inc. King City (Monterey County)
  • Live Oak Springs Water and Power Co. Boulevard (San Diego County)
  • Llano Del Rio Water Company Llano (Los Angeles County)
  • Long Canyon Water Company Bakersfield (Kern County)
  • Lytle Springs Water Company Lytle Creek (San Bernardino County)
  • MacDoel Water Works Klamath Falls (Siskiyou County)
  • Madden Creek Water Company Tahoma (Placer County)
  • Meadow Valley Water Works Meadow Valley (Plumas County)
  • Mecchi Water Company San Jose (Santa Clara County)
  • Meyers Water Company Napa (Napa County)
  • MHC Aquisition One, LLC Chicago (Santa Cruz County)
  • Mira Monte Water Company Gerber (Tehama County)
  • Mountain Mesa Water Company Bakersfield (Kern County)
  • Owens Valley Water Company Los Angeles (Inyo County)
  • Pierpoint Springs Resort Water Co. Camp Nelson (Tulare County)
  • Pinon Hill Water Company Tehachapi (Kern County)
  • Point Arena Water Works, Inc. Point Arena (Mendocino County)
  • Ponderosa Sky Ranch Water System Paynes Creek (Tehama County)
  • PureSource Water, Inc. Aptos (Santa Cruz County)
  • R.R. Lewis Small Water Company Stockton (Sierra County)
  • Ramona Water Company Palm Desert (Riverside County)
  • Redwood Lodge Water Company Los Gatos (Santa Cruz County)
  • Riverview Estates Water Company Red Bluff (Tahama County)
  • Rolling Green Utilities, Inc. Big Pine (Inyo County)
  • Sequoia Crest, Inc. Springville (Tulare County)
  • Sereno Del Mar Water Company Sereno Del Mar (Sonoma County)
  • Sierra City Water Works, Inc. Sierra City (Sierra County)
  • Slide Inn/Snobowl Water Company Sonora (Tuolumne County)
  • Sonoma Springs Water Company, LLC Kenwood (Sonoma County)
  • Sonora Water Company Sonora (Tuolumne County)
  • Spreckels Water Company Spreckels (Monterey County)
  • Spring Crest Water and Power Company Mountain Center (Riverside County)
  • Stone Creek Water, Inc. Stone Creek (Riverside County)
  • Susan River Park Water Company Susanville (Lassen County)
  • Tahoe Swiss Village Utilities, Inc. Homewood (El Dorado and Placer Counties)
  • Timberland Water Service Tahoe City (Placer County)
  • Traver Water Company Coalinga (Tulare County)
  • Trinity Village Water Company Eureka (Trinity County)
  • Twin Lakes Enterprises Bridgeport (Mono County)
  • Twin Valley Water Company, Inc. Morgan Hill (Santa Clara County)
  • Vista Grande Water System Gerber (Tehama County)
  • Warring Water Service, Inc. Piru (Ventura County)
  • Weimar Water Company, Inc. Weimar (Placer County)
  • Wendell Water Company Santa Rosa (Sonoma County)
  • West San Martin Water Works, Inc. San Martin (Santa Clara County)
  • West Water Company Cloverdale (Sonoma County)
  • Yerba Buena Water Company Thousand Oaks (Ventura County)
  • Yermo Water Company Yermo (San Bernardino County)
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