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.