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Well & TapHome Water Treatment Database

PFAS in California drinking water

EPA's final UCMR 5 data covers 707 public water systems in California, serving about 39 million people. PFAS turned up in 239 of them (34%). 132 averaged above at least one EPA limit at a sampling point, affecting about 8.9 million people.

Highest PFOA and PFOS averages among systems serving 1,000 or more: Running Springs Water District (11.7 / 131 ppt), Liberty Utilities - Bellflower-norwalk (15.5 / 55.0 ppt), Montebello Land & Water CO. (14.0 / 46.5 ppt), City of Sacramento Main (16.4 / 38.8 ppt) and City of Clovis (16.0 / 36.0 ppt).

Every tested system in California

Largest first. PFOA and PFOS columns show the average at each system's worst sampling point; EPA's limit for each is 4 ppt. Filter by name:

Water system People PFOA PFOS PFAS found Result
Los Angeles-city, Dept. of Water & Power · Los Angeles 3,875,566 - - 0 None found
East Bay MUD · Oakland 1,442,800 - - 2 Below limits
City of San Diego · San Diego 1,385,379 - - 0 None found
San Jose Water · San Jose 1,039,920 - 3.1 2 Sample at limit
Sfpuc City Distribution Division · Burlingame 848,019 - - 0 None found
Eastern Municipal WD · Perris 666,581 - - 0 None found
City of Fresno · Fresno 545,716 13.5 21.5 10 Above limit
City of Sacramento Main · Sacramento 527,979 16.4 38.8 8 Above limit
Long Beach-city, Water Dept. · Long Beach 466,772 - - 0 None found
Irvine Ranch Water District · Irvine 444,800 - - 2 Below limits
City of Anaheim · Anaheim 348,593 10.1 29.0 7 Above limit
Alameda County Water District · Fremont 344,000 - - 0 None found
City of Santa Ana · Santa Ana 310,539 8.1 13.6 5 Above limit
City of Riverside · Riverside 298,398 - 1.0 3 Sample at limit
Santa Clarita Valley W.a.-valencia Divis · Newhall 294,090 13.9 7.0 8 Above limit
Gswc - Southwest · Hawthorne 277,740 - - 0 None found
Helix Water District · La Mesa 277,668 - - 0 None found
Coachella Vwd: Cove Community · Palm Desert 270,000 - - 0 None found
Cws - Bakersfield · San Jose 267,881 4.5 13.5 7 Above limit
San Gabriel Valley Water Co.-el Monte · El Monte 248,000 - - 2 Below limits
Otay Water District · Spring Valley 238,008 - - 0 None found
San Gabriel Valley Wc - Fontana · Fontana 237,700 - - 0 None found
City of Modesto · Modesto 218,771 5.8 18.5 7 Above limit
San Bernardino City · San Bernardino 214,665 - - 4 Below limits
Cucamonga Valley Water District · Rancho Cucuamonga 211,069 - - 0 None found
Los Angeles Cwwd 40,reg 4 & 34-lancaster · Alhambra 208,129 - - 0 None found
City of Huntington Beach · Huntington Beach 201,000 - 5.5 2 Above limit
Oxnard Water Dept · Oxnard 200,232 - - 0 None found
Contra Costa Water District · Concord 198,000 - - 0 None found
Sacramento Suburban Water District · Sacramento 194,444 - - 4 Below limits
City of Stockton · Stockton 191,302 3.4 14.0 3 Above limit
Sweetwater Authority · Chula Vista 191,282 9.2 3.9 8 Above limit
Glendale-city, Water Dept. · Glendale 188,784 14.2 15.2 8 Above limit
Marin Municipal Water District · Corte Madera 186,895 - - 0 None found
Ontario Municipal Utilities Company · Ontario 185,010 15.0 2.6 6 Above limit
Scwa - Laguna/vineyard · Sacramento 184,896 9.7 15.4 7 Above limit
San Francisco International Airport · San Francisco 183,386 - - 0 None found
California Water Service - Stockton · San Jose 176,266 - 2.6 1 Sample at limit
City of Santa Rosa · Santa Rosa 175,396 - - 0 None found
City of Garden Grove · Garden Grove 174,226 8.1 18.6 6 Above limit
City of Oceanside · Oceanside 171,483 - - 0 None found
Moulton Niguel Water District · Laguna Hills 170,236 - - 0 None found
Elsinore Valley Mwd · Lake Elsinore 169,455 - - 1 Below limits
Suburban Water Systems-san Jose · Covina 168,843 - - 4 Below limits
City of Corona · Corona 168,575 - - 4 Below limits
Santa Margarita Water District · Rancho Santa Margarita 168,289 - - 0 None found
Pasadena-city, Water Dept. · Pasadena 164,344 - - 0 None found
City of Hayward · Hayward 162,954 - - 0 None found
City of Bakersfield · San Jose 160,144 - 8.0 3 Above limit
City of Sunnyvale · Sunnyvale 157,566 - - 0 None found
City of Roseville · Roseville 155,612 - - 0 None found
California Water Service CO. - Ela · San Jose 152,474 - 8.2 5 Above limit
Pomona - City, Water Dept. · Pomona 151,713 6.5 14.5 6 Above limit
Cws - Visalia · San Jose 148,496 2.1 5.7 6 Above limit
Rancho California Water District · Temecula 146,147 10.5 13.5 8 Above limit
California Water Service CO. - Dominguez · San Jose 143,996 - - 1 Below limits
City of Fullerton · Fullerton 139,461 10.8 13.3 8 Above limit
City of Escondido · Escondido 137,044 - - 0 None found
Victorville Water District · Victorville 135,983 - - 0 None found
Jurupa Community Sd · Jurupa Valley 135,093 - - 0 None found
Vista Irrigation District · Vista 132,430 - - 0 None found
El Dorado Id - Main · Placerville 132,171 - - 1 Below limits
City of Santa Clara · Santa Clara 130,746 - - 0 None found
City of Clovis · Clovis 130,130 16.0 36.0 10 Above limit
Palmdale Water Dist. · Palmdale 126,804 - - 3 Below limits
Cwsc Salinas · San Jose 123,679 - - 0 None found
City of Vallejo · Vallejo 121,420 - - 0 None found
City of Orange · Orange 120,770 9.1 16.9 7 Above limit
City of Fairfield · Fairfield 120,377 - - 0 None found
City of Antioch · Antioch 115,074 - - 0 None found
Cal-water Service Co.-chico · San Jose 114,925 3.4 16.8 6 Above limit
Golden State Wc - West Orange County · Anaheim 114,379 7.5 15.2 5 Above limit
Vallecitos WD · San Marcos 113,500 - - 0 None found
Ventura Water Department · Ventura 113,500 - - 2 Below limits
Downey - City, Water Dept. · Downey 110,556 12.5 38.0 8 Above limit
Great Oaks Wc INC · San Jose 110,088 - 2.3 4 Sample at limit
Azusa Light and Water · Azusa 110,044 3.9 2.8 3 Sample at limit
Mesa Water District · Costa Mesa 110,000 - - 0 None found
Santa Maria Water Department · Santa Maria 109,477 - - 0 None found
East Valley Water District · Highland 108,629 8.7 12.0 7 Above limit
Torrance-city, Water Dept. · Torrance 106,183 - - 0 None found
Cal-am Water Coronado · Imperial Beach 106,000 - - 0 None found
Burbank-city, Water Dept. · Burbank 105,603 - - 3 Below limits
City of Daly City · Daly City 104,901 - - 0 None found
West Valley Water District · Rialto 104,498 - - 0 None found
California Water Service - San Mateo · San Jose 102,348 - - 0 None found
City of San Jose - Evg/edv/coy · San Jose 101,265 - - 0 None found
Walnut Valley Water District · Walnut 100,941 - - 0 None found
Hesperia WD · Hesperia 100,744 0.6 0.8 7 Sample at limit
South Tahoe PUD - Main · South Lake Tahoe 100,000 5.6 5.0 8 Above limit
City of Vacaville · Elmira 99,650 2.6 9.9 4 Above limit
City of Santa Barbara Water Department · Santa Barbara 99,323 - - 0 None found
Dublin San Ramon Services District · Pleasanton 98,776 - - 0 None found
California Water Service CO. - Herm/redo · San Jose 96,853 - - 0 None found
City of Tracy · Tracy 96,609 - - 0 None found
Carlsbad Mwd · Carlsbad 95,158 - - 0 None found
Ventura Wwd No. 8 - Simi Valley · Simi Valley 94,738 - - 0 None found
Santa Cruz Water Department · Santa Cruz 94,626 - - 0 None found
Padre Dam Mwd · Santee 93,980 - - 1 Below limits
City of Merced · Merced 93,692 3.1 6.8 4 Above limit
City of Redwood City · Redwood City 92,819 - - 0 None found
Cal Am Water Company - Monterey · Pacific Grove 92,450 6.9 6.1 8 Above limit
City of Westminster · Westminster 90,911 - 4.8 2 Above limit
Santa Monica-city, Water Division · Los Angeles 89,947 2.3 - 6 Sample at limit
City of Redding · Redding 89,628 14.1 11.1 7 Above limit
Placer Cwa - Foothill · Auburn 89,544 - - 0 None found
Olivenhain Mwd · Encinitas 86,458 - - 0 None found
City of Chino · Chino 86,435 - - 0 None found
Western Mwd · Riverside 86,062 - - 3 Below limits
City of Manteca · Manteca 84,928 6.1 - 4 Above limit
City of Napa · Napa 84,804 - - 0 None found
Indio Water Authority · Indio 84,757 - - 0 None found
Goleta Water District · Goleta 84,462 - - 2 Below limits
Yorba Linda Water District · Placentia 84,292 - - 2 Below limits
City of Buena Park · Buena Park 81,998 - 6.1 2 Above limit
City of Milpitas · Milpitas 81,773 - - 0 None found
City of Mountain View · Mountain View 81,501 - - 0 None found
Folsom, City of - Main · Folsom 80,969 - - 0 None found
Inglewood- City, Water Dept. · Inglewood 80,824 2.2 - 1 Sample at limit
City of Alhambra · Alhambra 79,776 - - 0 None found
City of Upland · Upland 78,376 - - 3 Below limits
Redlands City Mud-water Div · Redlands 78,025 4.3 5.4 3 Above limit
City of Pleasanton · Pleasanton 76,689 5.0 24.0 8 Above limit
South Gate-city, Water Dept. · South Gate 76,443 9.1 24.0 6 Above limit
City of Chino Hills · Chino Hills 76,414 - - 0 None found
Compton-city, Water Dept. · Compton 74,877 2.4 15.5 3 Above limit
Desert Water Agency · Palm Springs 74,807 - - 0 None found
City of Turlock · Turlock 72,682 - - 0 None found
Liberty Utilities - Bellflower-norwalk · Downey 72,624 15.5 55.0 8 Above limit
Las Virgenes Mwd · Calabasas 72,602 - - 0 None found
City of Tulare · Tulare 72,241 - - 0 None found
California Water Service CO. - Palos Ver · San Jose 71,452 - - 0 None found
City of Yuba City · Yuba City 70,256 - - 0 None found
Cwsc Los Altos Suburban · San Jose 69,973 - - 1 Below limits
Valley County Water Dist. · Baldwin Park 68,871 - - 0 None found
City of Newport Beach · Newport Beach 68,572 - - 0 None found
City of Lodi · Lodi 68,272 3.1 5.1 7 Above limit
Citrus Heights Water District · Citrus Heights 67,818 - - 0 None found
City of Davis · Davis 67,457 - - 0 None found
City of Palo Alto · Palo Alto 67,231 - - 0 None found
Lynwood-city, Water Dept. · Lynwood 66,967 7.0 22.0 4 Above limit
Beaumont Cherry Valley WD · Beaumont 66,841 - - 0 None found
Cal American Water CO · Rosemead 66,809 - - 0 None found
City of Tustin · Tustin 66,600 - 2.1 3 Sample at limit
City of Madera · Madera 66,560 - - 0 None found
Lakewood - City, Water Dept. · Lakewood 66,135 - 17.6 2 Above limit
Suburban Water Systems - Whittier · Covina 66,045 6.2 12.5 6 Above limit
City of Watsonville · Watsonville 65,231 5.8 4.8 6 Above limit
Brentwood · Brentwood 64,513 - - 0 None found
Liberty Utilities (av Ranchos) Corp. · Downey 64,469 - - 0 None found
California Water Service-s San Francisco · San Jose 64,146 - - 0 None found
City of Porterville · Porterville 63,487 21.0 17.0 8 Above limit
Gswc - Florence/graham · Anaheim 63,472 - - 0 None found
City of La Habra · La Habra 63,118 - - 0 None found
City of Pittsburg · Pittsburg 62,500 - - 0 None found
Monterey Park-city, Water Dept. · Monterey Park 62,183 - - 2 Below limits
City of Hanford · Hanford 62,127 - - 0 None found
North Marin Water District · Novato 61,691 - - 0 None found
City of Woodland · Woodland 61,462 - - 0 None found
California Water Service - Bear Gulch · San Jose 61,431 - - 0 None found
City of Petaluma · Petaluma 60,781 - - 0 None found
California Water Service - Livermore · San Jose 60,414 2.3 10.4 6 Above limit
City of Gilroy · Gilroy 59,203 5.8 2.9 7 Above limit
Suburban Water Systems-la Mirada · Covina 56,793 5.8 12.3 6 Above limit
City of Fountain Valley · Fountain Valley 56,747 - - 1 Below limits
Gswc-san Dimas · San Dimas 56,538 - 4.5 2 Above limit
Alco Water Service · Salinas 56,253 - - 0 None found
Rowland Water District · Rowland Heights 56,100 - - 1 Below limits
Monte Vista Cwd · Montclair 56,017 - 5.4 5 Above limit
Paramount - City, Water Dept. · Paramount 55,200 - - 0 None found
Gswc - Bell, Bell Gardens · Anaheim 55,050 - 11.7 6 Above limit
Cal Am - Suburban Rosemont · Sacramento 54,793 4.1 11.9 7 Above limit
City of Lincoln · Lincoln 54,538 - 2.1 2 Sample at limit
City of Ceres · Ceres 54,513 8.3 18.5 7 Above limit
City of Rialto · Rialto 54,453 3.6 - 7 Sample at limit
City of West Sacramento · West Sacramento 53,355 - - 0 None found
Thousand Oaks Water Dept · Thousand Oaks 53,157 - - 0 None found
Lake Hemet Mwd · Hemet 52,913 - - 0 None found
Yucaipa Valley Water District · Yucaipa 52,010 2.1 - 4 Sample at limit
El Toro Water District · Lake Forest 51,800 - - 1 Below limits
City of San Clemente · San Clemente 51,545 - - 0 None found
City of Delano · Delano 51,428 - - 0 None found
City of Arcadia · Arcadia 51,361 - 9.4 2 Above limit
Calam - Parkway · Sacramento 50,573 2.1 12.6 6 Above limit
Gswc - Artesia · Anaheim 50,415 - 12.0 2 Above limit
Golden State Wc - Placentia/yorba Linda · Anaheim 50,381 5.9 6.1 7 Above limit
Whittier-city, Water Dept. · Whittier 49,954 3.8 9.5 6 Above limit
Glendora-city, Water Dept. · Glendora 49,934 - - 0 None found
City of Poway · Poway 49,888 - - 0 None found
UC Davis · Davis 49,616 - - 0 None found
City of Brea · Brea 48,479 - - 0 None found
Calam - Lincoln Oaks · Sacramento 48,094 - - 1 Below limits
Cal/am Water Company - San Marino · Rosemead 47,995 - - 1 Below limits
San Luis Obispo Water Department · San Luis Obispo 47,788 - - 0 None found
Cerritos - City, Water Dept. · Cerritos 47,475 - 2.4 1 Sample at limit
City of Los Banos · Los Banos 47,419 - - 0 None found
City of Morgan Hill · Morgann Hill 47,374 - - 3 Below limits
Golden State Water CO. - Cordova · Rancho Cordova 47,161 - - 0 None found
Camarillo Water Dept · Camarillo 46,824 - - 0 None found
City of Colton · Colton 46,525 5.9 18.0 6 Above limit
Bellflower - Somerset Mwc · Bellflower 46,300 - 16.0 2 Above limit
City of San Jose - Nsj/alviso · San Jose 45,559 - - 0 None found
Golden State Water Company - Simi Valley · Rancho Cordova 45,128 - - 0 None found
Oildale Mwc · Bakersfield 44,899 - - 0 None found
Hawthorne-city Water Dept. · San Jose 44,718 - - 0 None found
City of Rohnert Park · Rohnert Park 43,821 - 2.2 3 Sample at limit
Elk Grove Water Service · Elk Grove 43,813 - - 2 Below limits
City of El Centro · El Centro 43,772 - - 0 None found
Coachella Water Authority · Coachella 43,590 - - 0 None found
Mission Springs WD · Desert Hot Springs 43,484 - - 0 None found
Diablo Water District · Oakley 43,357 - - 0 None found
Gswc - Norwalk · Anaheim 43,167 - - 3 Below limits
City of San Bruno · San Bruno 42,631 - - 0 None found
Camp Pendleton (south) · Camp Pendleton 42,219 - - 2 Below limits
Sacramento International Airport [sws] · Sacramento 41,717 - - 0 None found
Indian Wells Valley W.d. · Ridgecrest 41,580 - - 0 None found
Carmichael Water District · Carmichael 41,193 - - 2 Below limits
South Coast Water District · Laguna Beach 41,118 - - 1 Below limits
California State University Fresno · Fresno 41,000 6.0 - 6 Above limit
Soquel Creek Water District · Soquel 40,809 - - 0 None found
Pico Rivera - City, Water Dept. · Pico Rivera 40,600 12.6 29.0 9 Above limit
Lompoc-city Water Utility Div · Lompoc 40,473 - - 0 None found
San Dieguito WD · Encinitas 40,405 1.1 - 4 Sample at limit
City of Calexico · Calexico 40,357 - - 0 None found
Beverly Hills-city, Water Dept. · Beverly Hills 40,121 - - 0 None found
City of Adelanto · Adelanto 39,930 - 4.4 2 Above limit
Gswc - Claremont · San Dimas 39,730 7.3 5.2 7 Above limit
City of San Juan Capistrano · Rancho Santa Margarita 39,684 - - 0 None found
San Gabriel County WD · Rosemead 39,345 - - 0 None found
City of Livermore · Livermore 38,892 - - 0 None found
North Coast County Water Dist · Pacifica 38,546 - - 0 None found
Marina Coast Water District · Marina 38,377 - - 0 None found
Gswc - Culver City · Santa Fe Springs 38,233 - - 0 None found
Tejon Castac WD - I5 & Laval Rd · Lebec 38,125 - - 0 None found
Monrovia-city, Water Dept. · Monrovia 37,931 2.7 5.1 6 Above limit
Vaughn Wc INC · Bakersfield 37,189 - - 2 Below limits
Ramona Municipal WD · Ramona 37,047 - - 0 None found
Nas North Island & Nab Coronado · San Diego 36,990 - - 0 None found
Rubidoux Community Sd · Jurupa Valley 36,827 - - 3 Below limits
Truckee-donner Pud, Main · Truckee 36,730 2.3 - 3 Sample at limit
Estero Municipal Improvement District · Foster City 36,556 - - 0 None found
Fair Oaks Water District · Fair Oaks 36,226 - - 0 None found
Stanford University · Stanford 35,853 - - 0 None found
Crescenta Valley Cwd · La Crescenta 35,841 4.6 - 6 Above limit
Calam - Antelope · Sacramento 35,534 - - 0 None found
Ventura Cwwd No. 1 - Moorpark · Moorpark 35,514 - - 0 None found
Lakeside WD · Lakeside 35,500 - 4.8 3 Above limit
California Water Service - San Carlos · San Jose 35,344 - - 0 None found
Fallbrook PUD · Fallbrook 35,237 - - 0 None found
City of Lathrop · Lathrop 35,080 - 15.0 3 Above limit
Golden State Water Co. - Orcutt · Hawthorne 34,102 - - 0 None found
City of Hemet · Hemet 33,828 - - 0 None found
Covina-city, Water Dept. · Covina 33,300 - - 0 None found
Camrosa Water District · Camarillo 32,700 - 8.5 2 Above limit
Manhattan Beach-city, Water Dept. · Manhattan Beach 32,697 - - 0 None found
Golden State Water CO - Barstow · Apple Valley 32,547 2.9 - 4 Sample at limit
East Niles CSD · Bakersfield 32,517 - - 0 None found
Los Angeles Cwwd 29 & 80-malibu · Alhambra 32,348 - - 0 None found
City of Banning · Banning 31,680 - - 1 Below limits
City of Burlingame · Burlingame 31,451 - - 0 None found
La Verne, City WD · La Verne 31,334 - - 0 None found
Paso Robles Water Department · Paso Robles 31,176 5.5 - 7 Above limit
Santa Paula Water System · Santa Paula 31,018 - - 0 None found
City of Martinez · Martinez 30,997 - - 0 None found
Scwa Mather-sunrise · Sacramento 30,825 - - 0 None found
Rincon Del Diablo Mwd (id-1) · Escondido 30,757 - - 1 Below limits
Atascadero Mutual Water CO · Atascadero 30,618 7.9 21.6 5 Above limit
Mid-peninsula Water District · Belmont 30,609 - - 0 None found
Valley Center Mwd · Valley Center 29,938 - - 0 None found
Calif State Polytechnical Univ - Pomona · Pomona 29,854 - - 4 Below limits
San Juan Water District · Granite Bay 29,598 - - 0 None found
City of East Palo Alto · East Palo Alto 29,519 - - 0 None found
City of Atwater · Atwater 29,479 16.5 22.5 10 Above limit
Suisun-solano Water Authority · Vacaville 29,105 - - 0 None found
Vernon-city, Water Dept. · Vernon 28,112 - - 0 None found
Placer Cwa - Auburn/bowman · Auburn 27,294 - - 0 None found
City of Dinuba · Dinuba 27,281 - - 0 None found
City of Lemoore · Lemoore 27,185 - - 0 None found
City of Benicia · Benicia 27,131 - - 3 Below limits
City of Eureka · Eureka 27,078 - - 0 None found
Gswc-south Arcadia · San Dimas 27,072 5.3 20.0 3 Above limit
City of Brawley · Brawley 26,862 - - 0 None found
Montebello Land & Water CO. · Montebello 26,554 14.0 46.5 8 Above limit
City of Galt · Galt 26,536 - - 0 None found
Cws - Selma · San Jose 26,517 - - 0 None found
Hi Desert WD · Yucca Valley 26,411 - - 3 Below limits
Liberty Utilities - Compton · Downey 26,371 - - 0 None found
City of Sanger · Sanger 26,357 5.0 6.2 4 Above limit
Gswc-south San Gabriel · San Dimas 26,240 - - 1 Below limits
Big Bear Lake Dwp - Big Bear System · Big Bear Lake 26,132 2.8 6.1 4 Above limit
City of Reedley · Reedley 26,076 - - 0 None found
City of Hollister · Hollister 26,017 - - 0 None found
Town of Windsor · Windsor 25,561 - - 0 None found
City of South Pasadena · South Pasadena 25,329 - - 0 None found
Sunny Slope Water CO. · Pasadena 25,252 - - 0 None found
City of Loma Linda · Loma Linda 25,129 - - 0 None found
City of Norco · Norco 25,068 10.5 22.4 7 Above limit
Orchard Dale Water District · Whittier 25,000 9.2 20.0 7 Above limit
City of Patterson · Patterson 24,977 - - 0 None found
Sunnyslope County Water Dist · Hollister 24,954 5.2 2.6 4 Above limit
Mountain House Community Services Dist. · Mountain House 24,948 - - 0 None found
City of Seal Beach · Seal Beach 24,937 - - 0 None found
City of Riverbank · Riverbank 24,834 - - 0 None found
Cal-am Water Company - Duarte · Rosemead 24,773 - 2.6 1 Sample at limit
Liberty Utilities - Lynwood · Downey 24,701 4.8 17.0 3 Above limit
Phelan Pinon Hills CSD · Phelan 24,285 - - 0 None found
San Fernando-city, Water Dept. · San Fernando 23,946 - - 0 None found
Golden State Water Company - Bay Point · Rancho Cordova 23,731 - - 0 None found
Rainbow Municipal WD · Fallbrook 23,536 - - 0 None found
City of Oakdale · Oakdale 23,235 - - 0 None found
Valley of the Moon Water District · El Verano 23,107 4.6 2.7 6 Above limit
El Monte-city, Water Dept. · El Monte 22,968 - 2.2 2 Sample at limit
City of Corcoran · Corcoran 22,808 - - 0 None found
City of Millbrae · Millbrae 22,795 - - 0 None found
Cws - North Garden · San Jose 22,762 - 4.5 1 Above limit
City of Wasco · Wasco 22,757 - - 0 None found
Sfwp-miners Ranch · Oroville 22,664 - - 0 None found
Menlo Park Municipal Water · Menlo Park 22,362 - - 0 None found
Pico WD · Pico Rivera 22,051 12.5 25.5 9 Above limit
Temescal Valley Water District · Temescal Valley 21,971 - - 0 None found
City of Shafter · Shafter 21,915 - - 0 None found
Linda County Water District · Marysville 21,654 - - 0 None found
City of Imperial · Imperial 21,591 - - 0 None found
Santa Fe I.d. · Rancho Santa Fe 21,578 - - 2 Below limits
City of American Canyon · American Canyon 21,437 - - 0 None found
Port Hueneme Water Dept · Port Hueneme 21,407 - - 0 None found
San Lorenzo Valley Water Dist · Boulder Creek 21,145 - - 1 Below limits
City of Arcata · Arcata 20,875 - - 0 None found
Cal/am Water Company - Baldwin Hills · Rosemead 20,724 - - 0 None found
West Kern Water District · Taft 20,500 - - 0 None found
Norwalk - City, Water Dept. · Norwalk 20,283 5.2 25.0 5 Above limit
Lomita-city, Water Dept. · Lomita 20,256 - 2.1 2 Sample at limit
Riverside Highland Water Company · Grand Terrace 20,188 16.5 15.5 9 Above limit
Humboldt C.s.d. · Cutten 19,807 - - 0 None found
Arvin Community Services Dist · Arvin 19,669 - - 0 None found
California Water Service CO - Westlake · San Jose 19,533 - - 0 None found
City of Soledad · Soledad 19,455 - - 0 None found
Santa Fe Springs - City, Water Dept. · Santa Fe Springs 19,219 5.5 10.5 5 Above limit
Quartz Hill Water Dist. · Quartz Hill 19,100 - - 0 None found
Lamont Public Utility Dist · Lamont 19,057 - - 0 None found
City of Greenfield · Greenfield 18,967 - - 0 None found
City of San Jacinto · San Jacinto 18,950 - - 0 None found
Coastside County Water District · Half Moon Bay 18,940 - - 0 None found
Twentynine Palms Water District · Twentynine Palms 18,795 - - 0 None found
Bella Vista Water District · Redding 18,612 - - 0 None found
Nps Ggnra · Sausalito 18,447 - - 0 None found
Laguna Beach County WD · Laguna Beach 18,404 - - 0 None found
California Water Service Co.-travis Afb · San Jose 18,111 - - 0 None found
Butte-glenn Community College Dist · Oroville 18,000 - - 0 None found
Arroyo Grande, Water Department · Arroyo Grande 17,963 3.6 4.2 6 Above limit
Rosamond CSD · Rosamond 17,711 - - 0 None found
Western Mwd - Murrieta Division · Riverside 17,453 5.1 4.9 3 Above limit
Bakman Water Company · Fresno 17,393 - - 0 None found
Coalinga-city · Coalinga 17,277 - - 0 None found
City of Crescent City · Crescent City 17,262 - - 0 None found
City of Kerman · Kerman 17,256 - - 0 None found
Nevada Id - E. George, Banner Mountain · Grass Valley 17,154 - - 0 None found
Mckinleyville C.s.d. · Mckinleyville 16,900 - - 0 None found
Orange Vale Water Company · Orangevale 16,861 - - 0 None found
Town of Discovery Bay · Discovery Bay 16,790 - - 0 None found
Pinedale County Water District · Pinedale 16,736 11.5 7.9 8 Above limit
City of Ukiah · Ukiah 16,607 1.7 4.1 9 Above limit
Olivehurst Public U.d. · Olivehurst 16,595 - - 0 None found
El Segundo-city, Water Dept. · El Segundo 16,445 - - 0 None found
Fillmore Water Dept · Fillmore 16,419 - - 0 None found
City of Cupertino · San Jose 16,336 - - 0 None found
Cwsc King City · San Jose 16,334 - - 0 None found
Nasa Ames Research Center · Moffett Field 16,273 - - 0 None found
Walnut Park Mutual Water CO. · Huntington Park 16,180 - - 0 None found
Lincoln Avenue Water CO. · Altadena 16,088 - - 0 None found
Usmc - 29 Palms · Twentynine Palms 16,067 - - 0 None found
Carpinteria Valley Water District · Santa Barbara 15,996 - - 0 None found
City of La Palma · La Palma 15,948 - - 0 None found
City of Ripon · Ripon 15,741 5.1 12.0 3 Above limit
Us Army Fort Irwin · Fort Irwin 15,701 - - 0 None found
Cal Am - Fruitridge Vista · Sacramento 15,652 - - 0 None found
Rio Linda/elverta Community Water Dist · Rio Linda 15,460 - - 2 Below limits
Northstar C.s.d. · Truckee 15,452 - - 0 None found
Huntington Park-city, Water Dept. · Huntington Park 15,437 5.1 22.0 3 Above limit
Loma Linda University · Loma Linda 15,368 - 2.1 2 Sample at limit
South Montebello Irrigation Dist. · Montebello 15,021 7.7 18.0 6 Above limit
Lemoore Naval Air Station · Lemoore 15,000 - - 0 None found
California Mens Colony · San Luis Obispo 15,000 - - 0 None found
American Water O&m, LLC - Vafb · Vandenberg Sfb 14,971 - - 0 None found
Sbdno County Service Area 64 · San Bernardino 14,911 - - 0 None found
City of Livingston · Livingston 14,894 - - 0 None found
City of Red Bluff · Red Bluff 14,710 3.7 - 4 Sample at limit
City of Parlier · Parlier 14,576 - - 0 None found
City of Modesto - Salida · Modesto 14,537 - - 0 None found
City of California City · California City 14,198 - - 0 None found
City of Mcfarland · Mcfarland 14,161 - - 0 None found
Nevada Id - Loma Rica · Grass Valley 14,072 - - 0 None found
Tract 180 Mutual Water CO. · Cudahy 14,000 6.2 23.0 4 Above limit
Chowchilla City Water Dept · Chowchilla 13,916 2.2 - 1 Sample at limit
Oak Park Water Service · Westlake Village 13,898 - - 0 None found
Nipomo Comm Services Dist · Nipomo 13,771 - - 0 None found
Morro Bay Pw Dept - Water Division · Morro Bay 13,757 - - 0 None found
City of Avenal · Avenal 13,696 - - 0 None found
Trabuco Canyon Water District · Trabuco Canyon 13,659 - - 0 None found
City of Kingsburg · Kingsburg 13,540 - - 0 None found
Westborough County Water Dist · South San Francisco 13,486 - - 0 None found
Tud - Upper Basin Water System · Sonora 13,280 - - 0 None found
Muscoy Mwc No. 1 · San Bernardino 13,000 - - 0 None found
Sbndo County Service Area 70j · San Bernardino 12,843 - - 0 None found
Big Bear City CSD · Big Bear City 12,738 2.2 7.2 8 Above limit
Grover Beach Water Department · Grover Beach 12,701 - - 0 None found
City of Lindsay · Lindsay 12,659 8.8 11.5 4 Above limit
Camp Pendleton (north) · Camp Pendleton 12,651 - - 1 Below limits
Los Angeles Cwwd 40, Reg. 38-lake La · Alhambra 12,568 - - 0 None found
City of Dixon · Dixon 12,540 - - 0 None found
Cal-water Service Co.-marysville · San Jose 12,419 - - 0 None found
City of Newman-water Department · Newman 12,207 - - 0 None found
Thermalito Water & Sewer Dist · Oroville 12,136 - 4.1 1 Above limit
City of Fortuna · Fortuna 12,133 - - 0 None found
Cabrillo College · Aptos 12,000 - - 0 None found
Montecito Water Dist · Santa Barbara 11,962 - - 0 None found
Signal Hill - City, Water Dept. · Signal Hill 11,848 - - 0 None found
Town of Hillsborough · Hillsborough 11,766 - - 0 None found
City of Sonoma · Sonoma 11,725 5.1 - 2 Above limit
Crestline Village Cwd - Division 10 · Crestline 11,650 2.2 1.3 7 Above limit
Greenfield County WD · Bakersfield 11,590 - - 0 None found
Ccwd - Ebbetts Pass · San Andreas 11,545 - - 0 None found
Los Angeles Cwwd 40, R 24,27,33-pearblsm · Alhambra 11,509 - - 0 None found
City of Bell Gardens · Downey 11,437 11.3 22.0 7 Above limit
City of Mendota · Mendota 11,404 - - 0 None found
Edwards Afb - Main Base · Edwards Afb 11,316 - - 0 None found
Scotts Valley Water District · Scotts Valley 11,197 - - 2 Below limits
City of Exeter · Exeter 11,169 - - 0 None found
City of Anderson · Anderson 11,147 - - 0 None found
Cal-water Service Co.-oroville · San Jose 11,106 - - 1 Below limits
Tud - Sonora/jamestown Water System · Sonora 11,054 - - 0 None found
Casitas Municipal Water Dist · Oak View 11,005 - - 0 None found
Sierra Madre-city, Water Dept. · Sierra Madre 11,000 - - 0 None found
Sonoma State University · Rohnert Park 10,986 - - 0 None found
City of Healdsburg · Healdsburg 10,985 - - 3 Below limits
Lawrence Livermore National Lab Site 200 · Livermore 10,870 - - 0 None found
GSWC - Willowbrook · Anaheim 10,793 - - 0 None found
California Institution for Men · Chino 10,667 - - 0 None found
City of Shasta Lake · Shasta Lake 10,657 - - 0 None found
California Water Service CO. - Dixon · San Jose 10,623 - - 0 None found
City of Rio Vista · Rio Vista 10,489 - - 0 None found
Plumas Lake · Olivehurst 10,464 - - 0 None found
City of Cloverdale · Cloverdale 10,398 - - 0 None found
City of Farmersville · Farmersville 10,243 - - 0 None found
South Mesa Wc · Calimesa 10,108 - - 4 Below limits
Scwa - Arden Park Vista · Sacramento 10,101 2.8 7.2 3 Above limit
Valley Water CO. · La Canada Flintridge 10,070 - - 0 None found
East Pasadena Water CO. · Rosemead 9,949 - - 0 None found
Ccwd - Jenny Lind · San Andreas 9,861 - - 0 None found
Golden Hills CSD · Tehachapi 9,857 14.4 6.8 7 Above limit
City of Blythe - · Blythe 9,798 - - 0 None found
Winton Water & Sanitary Dist · Winton 9,745 - - 0 None found
San Gabriel Valley Water Co.-montebello · El Monte 9,630 - - 0 None found
City of Orange Cove · Orange Cove 9,525 - - 0 None found
Myoma Dunes Mutual Water Company · Bermuda Dunes 9,445 - - 0 None found
Georgetown Divide PUD · Georgetown 9,434 - - 0 None found
City of Huron · Huron 9,306 - - 0 None found
La Canada Irrigation Dist. · La Canada 9,300 - - 0 None found
City of Live Oak · Live Oak 9,285 - - 2 Below limits
California State Fair · Sacramento 9,280 - 14.0 2 Above limit
Placerville, City of - Main · Placerville 9,224 - - 0 None found
Rubio Canon Land & Water Association · Altadena 9,215 7.4 17.0 7 Above limit
Paradise Irrigation District · Paradise 9,142 - - 0 None found
Nevada Id - Lake Wildwood · Grass Valley 9,108 - - 0 None found
City of Tehachapi · Tehachapi 9,094 - - 0 None found
Clear Creek Csd-anderson · Anderson 8,900 - - 0 None found
Guadalupe Water Department · Guadalupe 8,897 - - 0 None found
Calam - West Placer · Sacramento 8,861 - - 0 None found
Awa Buckhorn Plant · Sutter Creek 8,791 - - 0 None found
City of Waterford · Waterford 8,788 - - 0 None found
City of Needles · Needles 8,766 - - 0 None found
Tract 349 Mutual Water CO. · Cudahy 8,700 7.9 34.7 4 Above limit
City of Gonzales · Gonzales 8,327 - - 0 None found
Orosi Public Utility District · Orosi 8,300 - - 0 None found
City of Orland · Orland 8,298 - - 0 None found
City of Corning · Corning 8,244 - - 0 None found
La Puente Valley Cwd · La Puente 8,243 - - 0 None found
Mammoth Cwd · Mammoth Lakes 8,234 - - 0 None found
Imperial Valley College · Imperial 8,150 - - 0 None found
Gswc - Hollydale · Anaheim 8,099 - - 1 Below limits
Firebaugh City · Firebaugh 8,096 - - 0 None found
Pismo Beach Water Department · Pismo Beach 8,036 - - 0 None found
Templeton CSD · Templeton 8,011 - - 2 Below limits
California-american Larkfield (puc) · Sacramento 7,913 - - 0 None found
Kirkwood Meadows Public Utility District · Kirkwood 7,851 - - 1 Below limits
City of Woodlake · Woodlake 7,846 - - 0 None found
Florin County Water District · Sacramento 7,831 10.6 6.3 6 Above limit
City of Yreka · Yreka 7,825 - - 0 None found
City of Susanville · Susanville 7,811 - - 0 None found
Delhi Cwd · Delhi 7,784 - 3.6 2 Sample at limit
Valencia Heights Water CO. · West Covina 7,775 3.4 2.1 6 Sample at limit
Highlands Mutual Water Company · Clearlake 7,772 - - 0 None found
Mammoth Mountain Ski Area - Outpost 14 · Mammoth Lakes 7,736 - - 0 None found
Western Heights Water Company · Yucaipa 7,705 - - 0 None found
Earlimart PUD · Earlimart 7,679 - - 0 None found
Oceano Comm Services Dist. · Oceano 7,601 - - 0 None found
City of Sebastopol · Sebastopol 7,522 - - 0 None found
Castroville Community Services District · Castroville 7,515 - - 0 None found
Folsom State Prison · Represa 7,502 - 1.7 1 Sample at limit
City of Hughson · Hughson 7,481 - - 0 None found
City of Dos Palos · Dos Palos 7,452 - - 0 None found
City of Fowler · Fowler 7,448 - - 1 Below limits
City of Escalon · Escalon 7,429 - - 0 None found
Gswc-calipatria · San Dimas 7,363 - - 0 None found
Montebello-city, Water Dept. · El Monte 7,330 - - 0 None found
Vandenberg Village Comm. Serv. Dist. · Lompoc 7,308 - - 0 None found
City of Cotati · Cotati 7,303 - - 0 None found
City of Gridley · Gridley 7,269 - 9.8 6 Above limit
Cal-water Service Co.-willows · San Jose 7,240 - - 0 None found
Awa, Ione · Sutter Creek 7,227 - - 0 None found
City of Winters · Winters 7,115 - - 1 Below limits
Los Osos Community Services District · Los Osos 7,086 11.5 5.9 8 Above limit
Lake Arrowhead CSD · Lake Arrowhead 7,038 12.0 5.9 8 Above limit
Santa Ynez River Water Cons. Dist. Id#1 · Santa Ynez 7,022 - - 0 None found
Peter Pitchess Honor Rancho Detn. Ctr · Castaic 7,000 4.8 6.0 3 Above limit
Golden State Wc - Cowan Heights · Anaheim 6,997 - - 2 Below limits
Heber Public Utility District · Heber 6,979 - - 0 None found
City of Fort Bragg · Fort Bragg 6,919 - - 0 None found
Nevada Id - Lake of Pines · Grass Valley 6,870 - - 0 None found
Nevada Id - North Auburn · Grass Valley 6,870 - - 0 None found
Ojai Water System · Oak View 6,801 - - 0 None found
Beale Air Force Base · Beale Afb 6,785 - - 0 None found
Foresthill Public Utility Dist · Foresthill 6,782 - - 0 None found
Nuevo Water Company · Nuevo 6,733 5.8 1.1 5 Above limit
Joshua Basin Water District · Joshua Tree 6,640 - - 0 None found
China Lake Naval Air Weapons Station · China Lake 6,600 - - 0 None found
Pajaro Community Services District · Royal Oaks 6,500 - - 0 None found
Lake of the Springs · Oregon House 6,500 - - 0 None found
Madera Valley Water Company · Madera 6,494 - - 0 None found
City of Colusa · Colusa 6,447 - - 0 None found
Los Angeles Cwwd 36-val Verde · Alhambra 6,376 - - 0 None found
City of Holtville · Holtville 6,355 - - 0 None found
Maywood Mutual Water CO. #2 · Maywood 6,349 - 2.1 1 Sample at limit
Helendale Community Service District · Helendale 6,347 10.9 20.5 7 Above limit
North Tahoe PUD - Main · Tahoe Vista 6,321 - - 0 None found
Calaveras PUD · San Andreas 6,286 - - 0 None found
Purissima Hills Water District · Los Altos Hills 6,245 - - 0 None found
Hidden Valley Lake CSD · Hidden Valley Lake 6,235 - - 0 None found
Northrop Grumman Corp. · Palmdale 6,214 5.3 - 8 Above limit
Golden State Water CO - Apple Vly South · Apple Valley 6,208 - - 0 None found
Cutler PUD · Cutler 6,200 - - 0 None found
City of Willits · Willits 6,175 - - 0 None found
City of Industry Waterworks Systems · La Puente 6,158 - - 0 None found
Solvang Water Division · Solvang 6,126 - - 1 Below limits
City of Gustine · Gustine 6,110 - - 0 None found
Ventura River Water District · Ojai 6,100 - - 0 None found
Montara Water and Sanitary District · Montara 6,078 - - 0 None found
Maywood Mutual Water CO. #3 · Maywood 6,059 7.0 24.8 3 Above limit
Lake Almanor Country Club Mwc · Lake Almanor 6,000 - - 0 None found
Sweetwater Springs Cwd - Guerneville · Guerneville 6,000 - - 0 None found
Bellflower Municipal Water System · Rosemead 5,999 6.7 30.5 4 Above limit
Malaga County Water District · Fresno 5,979 - - 0 None found
Konocti County Water District · Clearlake 5,928 - - 2 Below limits
Golden State Water Company - Los Osos · Hawthorne 5,924 - - 4 Below limits
Glen Helen Water System · San Bernardino 5,900 - - 4 Below limits
Santa Ana River Water Company · Jurupa Valley 5,848 - - 0 None found
San Joaquin County - Lincoln Village · Stockton 5,841 - - 0 None found
Rancho Murieta Community Servi · Rancho Murieta 5,728 - - 0 None found
Keyes Community Services Dist. · Keyes 5,672 - - 0 None found
Tahoe City PUD - Main · Tahoe City 5,661 - - 0 None found
Serrano Water District · Villa Park 5,659 - - 2 Below limits
Golden State Water CO - Arden Water Serv · Rancho Cordova 5,658 - - 0 None found
Cal Am - Meadowbrook · Sacramento 5,656 - 7.8 1 Above limit
City of Calistoga · Calistoga 5,610 1.6 3.1 4 Sample at limit
Bear Valley CSD · Tehachapi 5,592 2.9 - 1 Sample at limit
City of Williams · Williams 5,538 - - 0 None found
Cambria Comm Services Dist · Cambria 5,532 - - 0 None found
Palm Ranch Irrigation Dist. · Quartz Hill 5,507 - - 0 None found
Hilmar County Water District · Hilmar 5,504 - - 0 None found
Maywood Mutual Water CO. #1 · Huntington Park 5,500 - 10.9 1 Above limit
Millview County Water District · Ukiah 5,500 - - 0 None found
Tud - Columbia Water System · Sonora 5,463 - - 0 None found
City of St. Helena · St. Helena 5,386 - - 0 None found
La Habra Heights Cwd · La Habra Heights 5,325 10.6 22.8 7 Above limit
Yosemite Spring Park Util CO · Coarsegold 5,300 6.4 6.9 6 Above limit
Cwsc Salinas Hills · San Jose 5,293 - - 0 None found
Running Springs Water District · Running Springs 5,268 11.7 131 10 Above limit
Suburban Water Systems-glendora · Covina 5,249 - - 0 None found
Redwood Valley County Water District · Ukiah 5,200 - - 0 None found
Ccwd - Copper Cove · San Andreas 5,187 - - 0 None found
Buellton Water Department · Buellton 5,161 - - 0 None found
Wasco St. Prison Reception Ctr · Wasco 5,124 - - 0 None found
California State Prison - Solano · Vacaville 5,100 - - 0 None found
Denair Community Services District · Denair 5,090 - - 0 None found
Joe's Travel Plaza (eh) · Westley 5,026 - - 0 None found
City of Jackson · Jackson 5,019 - - 0 None found
Kern Valley State Prison · Delano 5,000 - - 0 None found
Pleasant Valley Mutual Water CO · Camarillo 5,000 8.3 4.9 5 Above limit
City of Grass Valley · Grass Valley 4,947 - - 0 None found
Awa, Tanner · Sutter Creek 4,940 - - 0 None found
Stallion Springs CSD · Tehachapi 4,910 - - 0 None found
La Cumbre Mutual Water CO · Santa Barbara 4,861 - - 0 None found
Del Paso Manor County Water Di · Sacramento 4,854 - - 0 None found
Las Flores Water CO. · Altadena 4,847 - - 0 None found
Blue Lake Springs Mut Wtr · Arnold 4,841 - - 0 None found
Los Angeles Cwwd 37-acton · Alhambra 4,805 - - 0 None found
Calipatria State Prison · Imperial 4,800 - - 0 None found
Union Public Utility District · Murphys 4,774 - - 0 None found
City of Lakeport · Lakeport 4,762 - - 0 None found
Mojave PUD · Mojave 4,699 - - 0 None found
Golden State Water Co.-clearlake System · Rancho Cordova 4,644 - - 0 None found
Valley View Mutual Water CO. · Baldwin Park 4,613 - - 0 None found
Coachella Vwd: I.d. No. 8 · Palm Desert 4,600 - - 0 None found
Ivanhoe Public Utility Dist · Ivanhoe 4,580 - - 0 None found
Channel Islands Beach CSD · Oxnard 4,560 - - 0 None found
Bass Lake Water Company · Sacramento 4,527 - - 1 Below limits
Golden State Water Company - Nipomo · Rancho Cordova 4,506 - - 1 Below limits
Sativa-l.a. Cwd · Covina 4,363 - 4.7 2 Above limit
Mt. Konocti Mutual Water Company · Kelseyville 4,360 - - 0 None found
Slvwd - Felton Water System · Boulder Creek 4,340 - - 0 None found
California Rehabilitation Center - Norco · Norco 4,300 - - 1 Below limits
Correctional Training Facility - Soledad · Soledad 4,269 - - 0 None found
Commerce-city, Water Dept. · San Jose 4,205 4.6 - 6 Above limit
Meiners Oaks Cwd · Ojai 4,200 - - 0 None found
Calam - Arden · Sacramento 4,191 5.3 2.9 5 Above limit
Meadow Vista Cwd · Meadow Vista 4,183 - - 0 None found
Golden State Water CO - Wrightwood · Apple Valley 4,177 - - 1 Below limits
Planada CSD · Planada 4,164 - 14.5 3 Above limit
Centerville C.s.d. · Redding 4,151 - - 0 None found
Russian River County Water District · Forestville 4,150 - - 0 None found
Armona Community Services Dist · Armona 4,143 - - 0 None found
City of Wheatland · Wheatland 4,124 - 9.2 2 Above limit
Kelseyville CO Waterworks District 3 · Lakeport 4,102 - - 0 None found
Centinela State Prison · Imperial 4,100 - - 0 None found
Atascadero State Hospital · Atascadero 4,100 - 18.6 5 Above limit
Chuckawalla Valley State Prison · Blythe 4,090 - - 0 None found
City of San Joaquin · San Joaquin 4,060 - - 0 None found
Farm Mutual W.c. (the) · Wildomar 4,026 1.1 1.1 5 Sample at limit
Sheep Creek Water Company · Phelan 4,002 - - 4 Below limits
Weaverville C.s.d. · Weaverville 3,975 - 12.4 2 Above limit
City of Del Mar · Del Mar 3,919 - - 0 None found
Cdcr-high Desert State Prison · Susanville 3,857 - - 0 None found
City of Angels · Angels Camp 3,836 - - 0 None found
So. Cal. Edison Co.-santa Catalina · Avalon 3,822 - - 1 Below limits
City of Bishop · Bishop 3,819 - - 0 None found
San Joaquin County-mokelumne Acres · Stockton 3,802 8.1 12.8 6 Above limit
Willow County Water District · Ukiah 3,797 - - 0 None found
American Valley CSD · Quincy 3,778 - - 1 Below limits
Cal Am - Oakhurst · Sacramento 3,693 - - 0 None found
City of Mt. Shasta · Mt. Shasta 3,642 - - 0 None found
Brooktrails Township CSD · Willits 3,632 - - 0 None found
Mission Hills CSD · Lompoc 3,600 - - 0 None found
Jackson Valley Irrigation District · Ione 3,553 - - 0 None found
Presidio of San Francisco · San Francisco 3,500 1.0 - 7 Sample at limit
San Antonio Water Company · Upland 3,441 - - 0 None found
Borrego WD · Borrego Springs 3,429 - - 0 None found
Groveland Community Serv Dist · Groveland 3,400 - 1.2 2 Sample at limit
Folsom, City of - Ashland · Folsom 3,317 - - 0 None found
Cottonwood County Water Dist. · Cottonwood 3,316 - - 0 None found
San Benito High School · Hollister 3,310 - - 0 None found
South Shore Recreation Area · South Lake Tahoe 3,300 - - 0 None found
City of Rio Dell · Rio Dell 3,300 - - 0 None found
Rancho Los Amigos Hospital · Alhambra 3,200 7.0 22.8 3 Above limit
Cwsc Oak Hills · San Jose 3,161 - - 0 None found
Littlerock Creek Irrigation Dist. · Littlerock 3,040 - - 0 None found
Cci - Tehachapi · Tehachapi 2,993 - - 0 None found
Heritage Ranch CSD · Paso Robles 2,956 - - 0 None found
Salinas Valley State Prison · Soledad 2,930 - - 0 None found
City of Vallejo-lakes System · Vallejo 2,800 - - 0 None found
Town of Yountville · Yountville 2,787 - - 0 None found
City of Alturas · Alturas 2,715 - - 1 Below limits
Terra Bella Irrigation District - Tbt · Terra Bella 2,656 - - 0 None found
Arrowhead Villas Mutual Service Company · Skyforest 2,654 - - 0 None found
Tipton Community Services Dist · Tipton 2,543 - - 0 None found
Bolinas Community PUD · Bolinas 2,483 - - 0 None found
Hgst INC · San Jose 2,439 - - 0 None found
Lucerne Water CO. - Cal Water Service · San Jose 2,129 - - 0 None found
Cwsc Las Lomas · San Jose 2,084 - - 0 None found
Sierra Tahoe Main Lodge · Twin Bridges 1,940 2.5 - 2 Sample at limit
Squaw Valley 8200 Water System · Olympic Valley 1,500 - - 0 None found
Guadalupe Valley Mid · Brisbane 1,472 2.4 2.1 6 Sample at limit
California Water Service Co.-lancaster · San Jose 1,387 - - 0 None found
City of Blue Lake · Blue Lake 1,172 - - 0 None found
Sea Ranch Water Company,the (puc) · Sea Ranch 1,160 - - 1 Below limits
Laton Community Services District · Laton 1,151 3.1 3.1 3 Sample at limit
Bakman Water-rolling Hills · Fresno 1,107 - - 0 None found
California-american Geyserville (puc) · Sacramento 1,046 - - 0 None found
Averydale Mwc · Lancaster 1,023 - - 0 None found
Thousand Trails San Benito Preserve · Paicines 1,017 - - 0 None found
Ponderosa Basin Mutual Wtr CO · Mariposa 798 - - 0 None found
Riverside Csa #122-mesa Verde · Blythe 766 - - 0 None found
Trout Gulch Mutual Water Company · Aptos 614 - - 0 None found
Csa 70 W-3 Hacienda · San Bernardino 611 - - 0 None found
San Francisco Regional Water System · Burlingame 600 - - 0 None found
San Joaquin River Club INC · Tracy 600 - - 0 None found
Meadows Union Elementary School · El Centro 550 - - 0 None found
Patterson Tract CSD · Visalia 550 - - 0 None found
Rancheritos Mwc · Apple Valley 487 - - 0 None found
Olympia Mobilodge · Fair Oaks 450 2.1 - 5 Sample at limit
Canada Woods Wc · Carmel 356 - - 0 None found
Porterville-jones Corner · Porterville 339 - - 0 None found
Lakeside Woods Mutual Water CO · Lakehead 310 - - 0 None found
Potrero Elementary School · Pine Valley 300 181 57.1 9 Above limit
Rodney Strong Vineyards · Healdsburg 160 - - 0 None found
Bar-len Mwc · Barstow 126 - - 0 None found
Tud-wards Ferry Ranches · Sonora 62 - - 3 Below limits
Whale Gulch Elementary School · Whitethorn 60 - - 0 None found
Wine Country Apartments · Stockton 40 - - 0 None found
Storer Transportation · Modesto 40 - - 0 None found
Mid Valley Ag · Oakdale 25 - - 0 None found
Santa Clarita Valley W.a.-santa Clarita 20.5 17.8 8 Above limit
Santa Clarita Valley W.a.-newhall Div. - - 1 Below limits
Santa Clarita Valley W.a.-castaic Div. - - 0 None found
Santa Clarita Valley W.a.-pinetree Div. - - 0 None found
Santa Clarita Valley W.a.-tesoro Div. - - 0 None found
City of Perris - - 3 Below limits
North Perris Water System - - 0 None found

On a private well in California?

EPA's program only covers public systems. Private wells are never part of UCMR 5, so the only way to know is to test. Our well testing guide covers which lab tests to order, and the best well water systems covers what to install once you have results.

Cite this page

Well & Tap. "PFAS in California drinking water: results for 707 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/california/

Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.