Public water system namePopulationLos Angeles-City, Dept. of Water & Power3,856,043City Of San Diego1,368,395San Jose Water1,010,207Eastern Municipal Water Department651,058City Of Fresno545,466City Of Sacramento Main518,161Irvine Ranch Water District433,652Alameda County Water District344,000City Of Anaheim337,159City Of Santa Ana308,189City Of Riverside298,398California Water Service (CWS) - Bakersfield266,643San Gabriel Valley Water Company-El Monte246,000City Of Modesto218,771San Bernardino City214,665City Of Stockton190,688Sweetwater Authority189,371Glendale-City, Water Department188,784Ontario Municipal Utilities Company185,010Sacramento County Water Authority - Laguna/Vineyard179,933City of Garden Grove174,226City of Oceanside171,063City Of Corona168,575Elsinore Valley Municipal Water District165,586City of Bakersfield158,260California Water Service Company - East Los Angeles152,217Pomona - City, Water Dept.151,713California Water Service (CWS) - Visalia147,320Rancho California Water District144,088City of Fullerton141,874Santa Clarita Water Division135,281Jurupa Community Services District134,049City of Clovis128,411City of Orange117,150South Tahoe PUD - Main117,013Golden State Water Company - West Orange114,185California Water Service (CWS) - Salinas113,074Cal-Water Service Company-Chico111,831Azusa Light And Water110,044Santa Clarita Valley W.A.-Valencia Divis108,813East Valley Water District108,686Burbank-City, Water Department104,535Hesperia Water District100,744West Valley Water District98,055City of Vacaville97,000City of Westminster95,256Santa Cruz Water Department95,017Cal Am Water Company - Monterey92,450City of Merced92,058Santa Monica-City, Water Division89,947City of Redding87,741City Of Manteca84,928Yorba Linda Water District84,140City of Buena Park81,998Inglewood- City, Water Department80,824Redlands City MUD-Water Division78,025City of Pleasanton76,689South Gate-City, Water Department76,443Compton-City, Water Department74,877Liberty Utilities - Bellflower-Norwalk71,786Valley County Water District68,871City of Newport Beach68,572City of Lodi68,272Lynwood-City, Water Department66,967City of Tustin66,600Suburban Water Systems - Whittier66,045City of Watsonville65,231California Water Service - South San Francisco64,121City of Porterville63,164Monterey Park-City, Water Department62,183California Water Service - Livermore60,414Golden State Water Company (GSWC) - Bell, Bell Gardens54,696City of Ceres54,513City of Rialto54,453California American Water Company - Suburban53,882Yucaipa Valley Water District52,010Golden State Water Company (GSWC) - Artesia50,355Golden State Water Company (GSWC) - Placentia50,196Whittier-City, Water Department49,954California American Water Company - Parkway49,464Cerritos - City, Water Department47,475City of Colton46,525Bellflower - Somerset MWC46,300City of Arcadia45,764City of Rohnert Park43,693Golden State Water Company (GSWC) - Norwalk43,133Camp Pendleton (South)42,998California State University Fresno41,000Pico Rivera - City, Water Department40,600San Dieguito WD40,096City of Adelanto39,930Golden State Water Company (GSWC) - Claremont39,566Monrovia-City, Water Department37,931Rubidoux Community SD36,827Truckee-Donner PUD, Main36,730Crescenta Valley CWD35,841City of Lathrop35,080Camrosa Water District32,700Golden State Water Company - Barstow32,661Atascadero Mutual Water Company30,618City of Atwater29,479Golden State Water Company (GSWC) - South Arcadia26,803Montebello Land & Water Company26,554City of Sanger26,241Golden State Water Company (GSWC)-South San Gabriel26,074Big Bear Lake Dwp - Big Bear System26,067City of Norco25,037Orchard Dale Water District25,000Liberty Utilities - Lynwood24,416Cal-Am Water Company - Duarte24,258El Monte-City, Water Dept.22,968California Water Service (CWS) - North Garden22,657Pico WD22,051Santa Fe Springs - City, Water Dept.19,219Riverside Highland Water Company18,681Arroyo Grande, Water Department17,963Norwalk - City, Water Department17,790Santa Clarita Valley W.A.--Newhall Division17,498Loma Linda University17,233Western Municipal Water District - Murrieta Division17,077Pinedale County Water District16,736City of Ukiah16,607City of Ripon15,769Huntington Park-City, Water Department15,275South Montebello Irrigation District15,021City of Red Bluff14,076Tract 180 Mutual Water Company14,000Camp Pendleton (North)12,972Big Bear City CSD12,738Cal-water Service Company - Marysville12,385Thermalito Water & Sewer District12,136City of Sonoma11,725Crestline Village County Water District - Division 1011,650City of Bell Gardens11,305Cal-Water Service Company - Oroville11,045Sacramento County Water Agency - Arden Park Vista10,101Golden Hills Community Services District9,857Rubio Canon Land & Water Association9,600Maywood Mutual Water Co. #39,500California State Fair9,290Florin County Water District7,831Valencia Heights Water Company7,775California-american Larkfield (puc)7,702City of Gridley7,444Cal-Water Service Company - Willows7,216Los Osos Community Services District7,086Lake Arrowhead CSD7,038Peter Pitchess Honor Rancho Detention Center7,000Nuevo Water Company6,733Helendale Community Service District6,347Golden State Water Company - Los Osos5,949Serrano Water District5,659Meadowbrook Water Company5,656City of Calistoga5,610Bear Valley Community Services District5,592Maywood Mutual Water Company #15,500Pleasant Valley Mutual Water Company5,000Commerce-City, Water Dept.4,203Atascadero State Hospital4,100Farm Mutual Water Company (the)4,026Cal Am - Arden3,970City of Wheatland3,712Weaverville C.S.D.3,408Rancho Los Amigos Hospital3,200Tract 349 Mutual Water Company3,132Cws - Kernville2,585Sierra Tahoe Main Lodge1,940Branch Center [Sws]1,700Laton Community Services District1,551Guadalupe Valley Mid1,472Lake Morena Views Mw Company360Cal Am - Raymond320Potrero Elementary School300Cws - Lakeland295Smucker Natural Foods85Alameda County Fairgrounds82Zone 7 Water Agency40