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Tap water quality report

PFAS in California

Of the 690 water suppliers tested for PFAS in California, 163 detected PFOA or PFOS (23.6%).

23.6%
of suppliers detected PFOA or PFOS
690
suppliers tested
California rankings Lead in California PFAS in California

What is PFAS?

PFAS — “forever chemicals” — are synthetic compounds that accumulate in the body and are linked to cancer, liver damage and immune effects. In 2024 the EPA set enforceable limits of 4 parts per trillion each for PFOA and PFOS. These are the only nationwide PFAS measurements, from the EPA’s UCMR-5 program.

Water suppliers

PFAS value per supplier, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Suppliers that detected PFOA or PFOS are highlighted and listed first. “Not detected” means the contaminant was measured but not found.
SupplierCityPopulationPFAS (ug/L)
Running Springs Water District Running Springs 5,268 0.2365 µg/L
Liberty Utilities - Bellflower-Norwalk Downey 72,624 0.0590 µg/L
Montebello Land & Water Co. Montebello 26,554 0.0530 µg/L
City of Atwater Atwater 29,479 0.0450 µg/L
Downey - City, Water Dept. Downey 110,556 0.0440 µg/L
City of Sacramento Main Sacramento 527,979 0.0414 µg/L
City of Clovis Clovis 130,130 0.0410 µg/L
Tract 349 Mutual Water Co. Cudahy 8,700 0.0365 µg/L
Atascadero State Hospital Atascadero 4,100 0.0330 µg/L
Bellflower Municipal Water System Rosemead 5,999 0.0326 µg/L
Norco, City of Norco 25,068 0.0314 µg/L
City of Fresno Fresno 545,716 0.0300 µg/L
Ontario Municipal Utilities Company Ontario 185,010 0.0300 µg/L
Pico Rivera - City, Water Dept. Pico Rivera 40,600 0.0300 µg/L
City of Anaheim Anaheim 348,593 0.0290 µg/L
Pico Wd Pico Rivera 22,051 0.0280 µg/L
Maywood Mutual Water Co. #3 Maywood 6,059 0.0264 µg/L
Modesto, City of Modesto 218,771 0.0260 µg/L
City of Pleasanton Pleasanton 76,689 0.0260 µg/L
South Gate-City, Water Dept. South Gate 76,443 0.0260 µg/L
Norwalk - City, Water Dept. Norwalk 20,283 0.0260 µg/L
Scwa - Laguna/Vineyard Sacramento 184,896 0.0240 µg/L
Ceres, City of Ceres 54,513 0.0240 µg/L
Tract 180 Mutual Water Co. Cudahy 14,000 0.0240 µg/L
Lynwood-City, Water Dept. Lynwood 66,967 0.0230 µg/L
Porterville, City of Porterville 63,487 0.0230 µg/L
Orchard Dale Water District Whittier 25,000 0.0230 µg/L
Huntington Park-City, Water Dept. Huntington Park 15,437 0.0230 µg/L
City of Bell Gardens Bell Gardens 11,437 0.0230 µg/L
Helendale Community Service District Helendale 6,347 0.0230 µg/L
La Habra Heights Cwd La Habra Heights 5,325 0.0230 µg/L
Cal-Water Service Co.-Chico — 114,925 0.0225 µg/L
Atascadero Mutual Water Co Atascadero 30,618 0.0223 µg/L
Gswc-South Arcadia San Dimas 27,072 0.0220 µg/L
South Montebello Irrigation Dist. Montebello 15,021 0.0201 µg/L
City of Garden Grove Garden Grove 174,226 0.0190 µg/L
Riverside Highland Water Company Grand Terrace 20,188 0.0190 µg/L
Rubio Canon Land & Water Association Altadena 9,215 0.0190 µg/L
Weaverville C.S.D. Weaverville 3,975 0.0190 µg/L
Golden Hills Csd Tehachapi 9,857 0.0186 µg/L
Pomona - City, Water Dept. Pomona 151,713 0.0180 µg/L
Colton, City of Colton 46,525 0.0180 µg/L
City of Orange Orange 120,770 0.0170 µg/L
Compton-City, Water Dept. Compton 74,877 0.0170 µg/L
Bellflower - Somerset Mwc — 46,300 0.0170 µg/L
City of Lathrop Lathrop 35,080 0.0170 µg/L
Camrosa Water District Camarillo 32,700 0.0170 µg/L
Liberty Utilities - Lynwood Downey 24,701 0.0170 µg/L
Santa Clarita Valley Water Agency Newhall 294,090 0.0169 µg/L
Lakewood - City, Water Dept. Lakewood 66,135 0.0167 µg/L
City of Redding Redding 89,628 0.0162 µg/L
Rancho California Water District Temecula 146,147 0.0160 µg/L
Golden State Wc - West Orange County Anaheim 114,379 0.0160 µg/L
Suburban Water Systems-La Mirada Covina 56,793 0.0160 µg/L
Glendale-City, Water Dept. Glendale 188,784 0.0158 µg/L
Gswc - Bell, Bell Gardens — 55,050 0.0150 µg/L
Cal Am - Parkway Sacramento 50,573 0.0147 µg/L
Los Osos Community Services District Los Osos 7,086 0.0147 µg/L
Planada Csd Planada 4,164 0.0147 µg/L
City of Santa Ana Santa Ana 310,539 0.0142 µg/L
Cws - Bakersfield — 267,881 0.0140 µg/L
Santa Fe Springs - City, Water Dept. Santa Fe Springs 19,219 0.0140 µg/L
California State Fair Sacramento 9,280 0.0140 µg/L
Lake Arrowhead Csd Lake Arrowhead 7,038 0.0140 µg/L
San Joaquin County-Mokelumne Acres Stockton 3,802 0.0135 µg/L
Cal Am - Suburban Rosemont Sacramento 54,793 0.0134 µg/L
City of Fullerton Fullerton 139,461 0.0133 µg/L
Suburban Water Systems-Whittier Covina 66,045 0.0130 µg/L
Gswc - Artesia — 50,415 0.0130 µg/L
Gswc - Claremont San Dimas 39,730 0.0129 µg/L
Calistoga, City of Calistoga 5,610 0.0122 µg/L
East Valley Water District Highland 108,629 0.0120 µg/L
California Water Service - Livermore — 60,414 0.0120 µg/L
California State University Fresno Fresno 41,000 0.0120 µg/L
Pinedale County Water District Pinedale 16,736 0.0120 µg/L
Ripon, City of Ripon 15,741 0.0120 µg/L
Florin County Water District Sacramento 7,831 0.0118 µg/L
Sweetwater Authority Chula Vista 191,282 0.0114 µg/L
Maywood Mutual Water Co. #1 Huntington Park 5,500 0.0113 µg/L
Hesperia Wd Hesperia 100,744 0.0111 µg/L
Lindsay, City of Lindsay 12,659 0.0110 µg/L
Pleasant Valley Mutual Water Co Camarillo 5,000 0.0110 µg/L
City of Wheatland Wheatland 4,124 0.0110 µg/L
City of Gridley Gridley 7,269 0.0105 µg/L
City of Vacaville Vacaville 99,650 0.0100 µg/L
City of Arcadia Arcadia 51,361 0.0100 µg/L
Big Bear City Csd Big Bear City 12,738 0.0099 µg/L
Guadalupe Valley Mid Brisbane 1,472 0.0096 µg/L
Commerce-City, Water Dept. Montebello 4,205 0.0093 µg/L
City of Merced Merced 93,692 0.0089 µg/L
Rincon Northern Valley Center 7,003 0.0089 µg/L
California Water Service Co. - Ela — 152,474 0.0086 µg/L
Cal Am - Meadowbrook — 5,656 0.0083 µg/L
Cal Am Water Company - Monterey Pacific Grove 92,450 0.0081 µg/L
City of Gilroy Gilroy 59,203 0.0080 µg/L
Yosemite Spring Park Util Co Coarsegold 5,300 0.0079 µg/L
Azusa Light and Water Azusa 110,044 0.0077 µg/L
Bakersfield, City of Bakersfield 160,144 0.0076 µg/L
Ukiah, City of Ukiah 16,607 0.0074 µg/L
City of Red Bluff Red Bluff 14,710 0.0074 µg/L