300 California water districts with results read from their own annual water quality report or EPA testing, largest first.
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- Los Angeles-City, Dept. of Water & Power3,856,043 people · 10 results
- East Bay MUD1,442,800 people · 17 results
- City of San Diego1,385,379 people · 28 results
- San Jose Water1,039,920 people · 12 results
- Sfpuc City Distribution Division848,019 people · 19 results
- City of Fresno545,716 people · 25 results
- City of Sacramento Main520,407 people · 12 results
- Long Beach Utilities Department466,772 people · 24 results
- City of Anaheim348,593 people · 30 results
- Alameda County Water District344,000 people · 14 results
- City of Santa Ana310,539 people · 33 results
- City of Riverside298,398 people · 28 results
- Gswc - Southwest277,740 people · 27 results
- Helix Water District277,668 people · 19 results
- Cws - Bakersfield267,881 people · 35 results
- San Gabriel Valley Wc - Fontana237,700 people · 23 results
- Oxnard Water Dept200,232 people · 25 results
- Contra Costa Water District198,000 people · 17 results
- Marin Municipal Water District186,895 people · 16 results
- Scwa - Laguna/Vineyard184,896 people · 21 results
- California Water Service - Stockton176,266 people · 22 results
- City of Santa Rosa175,396 people · 13 results
- Suburban Water Systems-San Jose168,843 people · 7 results
- City of Corona168,575 people · 18 results
- Santa Margarita Water District168,289 people · 14 results
- Pasadena Water and Power164,344 people · 18 results
- City of Hayward162,954 people · 11 results
- City of Bakersfield160,144 people · 12 results
- City of Roseville155,612 people · 6 results
- California Water Service Co. - Ela152,474 people · 18 results
- Cws - Visalia148,496 people · 13 results
- California Water Service Co. - Dominguez143,996 people · 13 results
- City of Fullerton139,461 people · 14 results
- Victorville Water District135,983 people · 11 results
- Jurupa Community Sd135,093 people · 12 results
- Vista Irrigation District132,430 people · 6 results
- Palmdale Water Dist.126,804 people · 8 results
- Cwsc Salinas123,679 people · 17 results
- City of Vallejo121,420 people · 7 results
- City of Antioch115,074 people · 15 results
- Cal-Water Service Co.-Chico114,925 people · 23 results
- Golden State Wc - West Orange County114,185 people · 24 results
- Ventura Water Department113,500 people · 2 results
- Great Oaks Wc INC110,088 people · 16 results
- Azusa Light and Water110,044 people · 14 results
- Mesa Water District110,000 people · 19 results
- Torrance-City, Water Dept.106,183 people · 6 results
- Burbank-City, Water Dept.105,603 people · 15 results
- City of Daly City104,901 people · 9 results
- California Water Service - San Mateo102,348 people · 15 results
- Walnut Valley Water District100,941 people · 6 results
- Hesperia WD100,744 people · 13 results
- City of Santa Barbara Water Department98,872 people · 5 results
- Dublin San Ramon Services District98,776 people · 9 results
- Santa Cruz Water Department94,626 people · 12 results
- Santa Monica-City, Water Division89,947 people · 13 results
- Western MWD86,062 people · 16 results
- City of Manteca84,928 people · 20 results
- City of Napa84,804 people · 12 results
- Goleta Water District84,462 people · 16 results
- City of Upland78,376 people · 26 results
- City of Milpitas77,961 people · 5 results
- City of Pleasanton76,689 people · 5 results
- South Gate-City, Water Dept.76,443 people · 17 results
- City of Chino Hills76,414 people · 4 results
- Desert Water Agency74,807 people · 18 results
- City of Turlock72,682 people · 18 results
- Liberty Utilities - Bellflower-Norwalk72,624 people · 14 results
- California Water Service Co. - Palos Ver71,452 people · 9 results
- Cwsc Los Altos Suburban70,175 people · 13 results
- Valley County Water Dist.68,871 people · 12 results
- City of Lodi68,272 people · 14 results
- Citrus Heights Water District67,818 people · 9 results
- City of Davis67,457 people · 7 results
- City of Palo Alto67,231 people · 7 results
- City of Tustin66,600 people · 4 results
- Lakewood - City, Water Dept.66,135 people · 16 results
- Suburban Water Systems-Whittier66,045 people · 26 results
- Liberty Utilities (Av Ranchos) Corp.64,469 people · 13 results
- California Water Service-S San Francisco64,121 people · 12 results
- Gswc - Florence/Graham63,500 people · 5 results
- City of Porterville63,164 people · 17 results
- City of La Habra63,118 people · 10 results
- City of Pittsburg62,500 people · 11 results
- North Marin Water District61,683 people · 8 results
- City of Woodland61,462 people · 8 results
- California Water Service - Bear Gulch60,903 people · 6 results
- California Water Service - Livermore60,414 people · 9 results
- City of Gilroy58,108 people · 8 results
- Suburban Water Systems-La Mirada56,793 people · 5 results
- City of Fountain Valley56,747 people · 8 results
- Gswc-San Dimas56,538 people · 6 results
- Monte Vista WD56,017 people · 14 results
- Gswc - Bell, Bell Gardens54,877 people · 4 results
- Rowland Water District54,660 people · 5 results
- City of Ceres54,513 people · 7 results
- City of Rialto54,453 people · 9 results
- City of Thousand Oaks Water Department53,157 people · 9 results
- Lake Hemet MWD52,913 people · 20 results
- Yucaipa Valley Water District52,010 people · 14 results
- El Toro Water District51,800 people · 14 results
- City of San Clemente51,545 people · 14 results
- City of Delano51,428 people · 17 results
- City of Arcadia51,361 people · 18 results
- Gswc - Artesia50,375 people · 13 results
- Golden State Wc - Placentia/Yorba Linda50,196 people · 14 results
- Glendora-City, Water Dept.49,934 people · 19 results
- City of Poway49,888 people · 5 results
- Uc - Davis49,616 people · 14 results
- City of Brea48,479 people · 15 results
- Cal/Am Water Company - San Marino47,995 people · 19 results
- San Luis Obispo Water Department47,788 people · 14 results
- Cerritos - City, Water Dept.47,475 people · 2 results
- City of Los Banos47,419 people · 17 results
- City of Morgan Hill47,374 people · 10 results
- Golden State Water Co. - Cordova47,161 people · 14 results
- Camarillo Water Dept46,824 people · 14 results
- City of Colton46,525 people · 13 results
- City of San Jose - Nsj/Alviso45,559 people · 6 results
- Golden State Water Company - Simi Valley45,128 people · 15 results
- Oildale Mwc44,899 people · 16 results
- Hawthorne-City Water Dept.44,718 people · 11 results
- Diablo Water District43,357 people · 12 results
- Gswc - Norwalk43,176 people · 12 results
- Camp Pendleton (South)42,219 people · 18 results
- Indian Wells Valley W.D.41,580 people · 15 results
- City of San Bruno41,327 people · 12 results
- Carmichael Water District41,193 people · 15 results
- South Coast Water District41,118 people · 13 results
- Soquel Creek Water District40,809 people · 14 results
- Pico Rivera - City, Water Dept.40,600 people · 16 results
- Lompoc-City Water Utility Div40,473 people · 10 results
- City of Calexico40,357 people · 13 results
- Beverly Hills-City, Water Dept.40,121 people · 7 results
- City of Adelanto39,930 people · 14 results
- Gswc - Claremont39,730 people · 12 results
- Santa Margarita Water District-Id939,684 people · 8 results
- San Gabriel County WD39,345 people · 16 results
- City of Livermore38,892 people · 5 results
- North Coast County Water Dist38,546 people · 12 results
- Marina Coast Water District38,377 people · 17 results
- Gswc - Culver City38,213 people · 15 results
- Ramona Municipal WD37,047 people · 4 results
- Nas North Island & Nab Coronado36,990 people · 7 results
- Rubidoux Community Sd36,827 people · 21 results
- Truckee-Donner PUD, Main36,730 people · 8 results
- Estero Municipal Improvement District36,556 people · 11 results
- Fair Oaks Water District36,226 people · 6 results
- Crescenta Valley CWD35,841 people · 11 results
- Ventura Cwwd No. 1 - Moorpark35,514 people · 5 results
- Lakeside WD35,500 people · 9 results
- California Water Service - San Carlos35,344 people · 10 results
- Fallbrook PUD35,237 people · 5 results
- City of Lathrop35,080 people · 5 results
- Golden State Water Company - Orcutt34,102 people · 14 results
- Stanford University33,827 people · 8 results
- Covina-City, Water Dept.33,300 people · 5 results
- Los Angeles Cwwd 29 & 80-Malibu32,792 people · 5 results
- Camrosa Water District32,700 people · 5 results
- Golden State Water Co - Barstow32,547 people · 16 results
- East Niles CSD32,517 people · 5 results
- City of Burlingame31,447 people · 14 results
- La Verne, City WD31,334 people · 11 results
- City of Paso Robles Water Division31,176 people · 25 results
- Scwa Mather-Sunrise30,825 people · 11 results
- Rincon del Diablo MWD (ID-1)30,757 people · 13 results
- Atascadero Mutual Water Co30,618 people · 24 results
- Mid-Peninsula Water District30,609 people · 14 results
- Valley Center MWD29,938 people · 7 results
- Calif State Polytechnical Univ - Pomona29,854 people · 14 results
- San Juan Water District29,598 people · 9 results
- City of East Palo Alto29,519 people · 7 results
- City of Atwater29,479 people · 10 results
- Suisun-Solano Water Authority29,105 people · 10 results
- Vernon-City, Water Dept.28,112 people · 21 results
- City of Benicia27,131 people · 18 results
- City of Eureka27,078 people · 11 results
- Gswc-South Arcadia27,072 people · 26 results
- City of Brawley26,862 people · 15 results
- Montebello Land & Water Co.26,554 people · 31 results
- Cws - Selma26,517 people · 17 results
- Hi Desert WD26,411 people · 23 results
- Liberty Utilities - Compton26,371 people · 12 results
- City of Sanger26,357 people · 19 results
- Gswc-South San Gabriel26,240 people · 25 results
- Big Bear Lake Dwp - Big Bear System26,132 people · 27 results
- City of Reedley26,076 people · 10 results
- City of Hollister26,017 people · 5 results
- Town of Windsor25,561 people · 14 results
- City of South Pasadena25,329 people · 7 results
- Sunny Slope Water Co.25,252 people · 22 results
- City of Norco25,068 people · 4 results
- Orchard Dale Water District25,000 people · 35 results
- Sunnyslope County Water Dist24,954 people · 21 results
- City of Mountain House24,948 people · 10 results
- City of Seal Beach24,937 people · 24 results
- City of Riverbank24,834 people · 26 results
- Cal-Am Water Company - Duarte24,773 people · 25 results
- Liberty Utilities - Lynwood24,701 people · 25 results
- Phelan Pinon Hills CSD24,285 people · 14 results
- San Fernando-City, Water Dept.23,946 people · 6 results
- Golden State Water Company - Bay Point23,731 people · 21 results
- Rainbow Municipal WD23,536 people · 17 results
- City of Oakdale23,235 people · 19 results
- Valley of the Moon Water District23,107 people · 12 results
- El Monte-City, Water Dept.22,968 people · 16 results
- City of Corcoran22,808 people · 19 results
- Cws - North Garden22,762 people · 1 results
- City of Wasco22,757 people · 11 results
- South Feather W&P - Miners Ranch22,664 people · 16 results
- Pico WD22,051 people · 32 results
- Temescal Valley Water District21,971 people · 3 results
- City of Shafter21,915 people · 23 results
- Linda County Water District21,654 people · 13 results
- Santa Fe I.D.21,578 people · 39 results
- City of Imperial21,233 people · 11 results
- City of Arcata20,875 people · 8 results
- Cal/Am Water Company - Baldwin Hills20,724 people · 17 results
- West Kern Water District20,500 people · 15 results
- Norwalk - City, Water Dept.20,283 people · 15 results
- Lomita-City, Water Dept.20,256 people · 5 results
- Riverside Highland Water Company20,188 people · 13 results
- Humboldt C.S.D.19,807 people · 5 results
- California Water Service Co - Westlake19,533 people · 9 results
- City of Soledad19,455 people · 9 results
- Menlo Park Municipal Water19,297 people · 18 results
- Santa Fe Springs - City, Water Dept.19,219 people · 22 results
- Quartz Hill Water Dist.19,100 people · 20 results
- Lamont Public Utility Dist19,057 people · 22 results
- City of Greenfield18,967 people · 25 results
- Coastside County Water District18,940 people · 9 results
- Twentynine Palms Water District18,795 people · 25 results
- Nps Ggnra18,447 people · 4 results
- Laguna Beach County WD18,404 people · 5 results
- California Water Service Co.-Travis Afb18,111 people · 17 results
- City of Arroyo Grande Utilities Division17,963 people · 18 results
- Western MWD - Murrieta Division17,453 people · 16 results
- Bakman Water Company17,393 people · 18 results
- Coalinga-City17,277 people · 24 results
- City of Crescent City17,262 people · 10 results
- City of Kerman17,256 people · 15 results
- Nevada ID - E. George, Banner Mountain17,154 people · 10 results
- Orange Vale Water Company16,861 people · 6 results
- Town of Discovery Bay16,790 people · 10 results
- Pinedale County Water District16,736 people · 16 results
- City of Ukiah16,607 people · 3 results
- Olivehurst Public U.D.16,595 people · 3 results
- Fillmore Water Dept16,419 people · 16 results
- Cwsc King City16,334 people · 13 results
- Carpinteria Valley Water District15,996 people · 5 results
- Sbdno County Service Area 6414,911 people · 3 results
- City of Livingston14,894 people · 9 results
- City of California City14,198 people · 9 results
- Tract 180 Mutual Water Co.14,000 people · 6 results
- Trabuco Canyon Water District13,659 people · 4 results
- City of Dixon12,540 people · 6 results
- City of Newman-Water Department12,207 people · 1 results
- Scotts Valley Water District11,197 people · 5 results
- City of Healdsburg10,985 people · 3 results
- Del Oro Water Co.-Paradise Pines10,940 people · 3 results
- California Water Service Co. - Dixon10,623 people · 2 results
- Valley Water Co.10,070 people · 1 results
- Cal-Am Water Company - East Pasadena9,949 people · 3 results
- Myoma Dunes Mutual Water Company9,445 people · 6 results
- California State Fair9,280 people · 2 results
- City of Gonzales8,327 people · 14 results
- City of Orland8,298 people · 2 results
- Mammoth CWD8,234 people · 2 results
- Firebaugh City8,096 people · 1 results
- Templeton CSD8,011 people · 1 results
- Western Heights Water Company7,705 people · 3 results
- Folsom State Prison7,502 people · 2 results
- City of Hughson7,481 people · 3 results
- Los Osos Community Services District7,086 people · 6 results
- Nuevo Water Company6,733 people · 3 results
- Serrano Water District5,659 people · 1 results
- Cal Am - Meadowbrook5,656 people · 4 results
- Riverstone/Rootcreek Water District5,507 people · 11 results
- Hilmar County Water District5,504 people · 3 results
- Yosemite Spring Park Util Co5,300 people · 1 results
- Suburban Water Systems-Glendora5,249 people · 8 results
- Denair Community Services District5,090 people · 3 results
- Calipatria State Prison4,800 people · 4 results
- Suburban Water Systems - Sativa4,363 people · 10 results
- Planada CSD4,164 people · 5 results
- Atascadero State Hospital4,100 people · 3 results
- Treasure Island3,864 people · 7 results
- San Joaquin County-Mokelumne Acres3,802 people · 5 results
- Mission Hills CSD3,600 people · 5 results
- Presidio of San Francisco3,500 people · 3 results
- Borrego WD3,429 people · 2 results
- City of Brisbane3,402 people · 3 results
- Valley State Prison3,173 people · 9 results
- Cwsc Oak Hills3,161 people · 4 results
- Aromas Water District2,988 people · 4 results
- Land Projects Mutual Water Co.2,800 people · 4 results
- Lake Shastina C.S.D2,790 people · 4 results
- Bolinas Community PUD2,483 people · 1 results
- Little Bear Water Company2,327 people · 3 results
- City of Biggs2,060 people · 13 results
Other districts with a few results read
Search these in the water lookup to see their numbers.
- City of Madera · 66,560 people
- Nasa Ames Research Center · 15,294 people
- Lemoore Naval Air Station · 15,000 people
- City of Parlier · 14,576 people
- City of Avenal · 13,696 people
- Sbdno County Service Area 70j · 12,843 people
- City of Shasta Lake · 10,657 people
- City of Live Oak · 9,285 people
- City of Tehachapi · 9,094 people
- Beale Air Force Base · 6,785 people
- Calaveras PUD · 6,286 people
- Lake Almanor Country Club Mwc · 6,000 people
- Armona Community Services Dist · 4,143 people
- Joint Regional Water Supply System · 3,947 people
- Lockeford Community Serv. Dist. · 3,572 people
- Jackson Valley Irrigation District · 3,553 people
- City of Rio Dell · 3,300 people
- Lukins Brothers Water Company · 3,277 people
- Madera Co Md10a-Madera Ranchos · 3,172 people
- Heritage Ranch CSD · 2,956 people
- Lerdo Sheriff S Facility · 2,800 people
- Central Water District · 2,726 people
- North Gualala Water Company · 2,593 people
- Rogina Water Company INC. · 2,554 people
- Erskine Creek Wc · 2,500 people
- Eastside Water Association · 2,000 people
- Fcsa #47/Quail Lake Estates · 1,988 people
- Home Garden CSD · 1,750 people