PFAS in California drinking water
690 community water systems tested
23.6%
of tested systems detected PFOA or PFOS
(163/690)
(163/690)
Water systems
PFAS value per system, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Systems that detected PFOA or PFOS
are highlighted and listed first. “Not detected” means the contaminant was measured but
not found.
| System | City | Population | PFAS (ug/L) |
|---|---|---|---|
| RUNNING SPRINGS WATER DISTRICT | 5,268 | 0.2365 ug/L | |
| LIBERTY UTILITIES - BELLFLOWER-NORWALK | 72,624 | 0.0590 ug/L | |
| MONTEBELLO LAND & WATER CO. | 26,554 | 0.0530 ug/L | |
| CITY OF ATWATER | ATWATER | 29,479 | 0.0450 ug/L |
| DOWNEY - CITY, WATER DEPT. | DOWNEY | 110,556 | 0.0440 ug/L |
| CITY OF SACRAMENTO MAIN | SACRAMENTO | 527,979 | 0.0414 ug/L |
| CITY OF CLOVIS | CLOVIS | 130,130 | 0.0410 ug/L |
| TRACT 349 MUTUAL WATER CO. | 8,700 | 0.0365 ug/L | |
| ATASCADERO STATE HOSPITAL | 4,100 | 0.0330 ug/L | |
| BELLFLOWER MUNICIPAL WATER SYSTEM | 5,999 | 0.0326 ug/L | |
| NORCO, CITY OF | NORCO | 25,068 | 0.0314 ug/L |
| CITY OF FRESNO | FRESNO | 545,716 | 0.0300 ug/L |
| ONTARIO MUNICIPAL UTILITIES COMPANY | ONTARIO | 185,010 | 0.0300 ug/L |
| PICO RIVERA - CITY, WATER DEPT. | PICO RIVERA | 40,600 | 0.0300 ug/L |
| CITY OF ANAHEIM | ANAHEIM | 348,593 | 0.0290 ug/L |
| PICO WD | 22,051 | 0.0280 ug/L | |
| MAYWOOD MUTUAL WATER CO. #3 | 6,059 | 0.0264 ug/L | |
| MODESTO, CITY OF | MODESTO | 218,771 | 0.0260 ug/L |
| CITY OF PLEASANTON | PLEASANTON | 76,689 | 0.0260 ug/L |
| SOUTH GATE-CITY, WATER DEPT. | SOUTH GATE | 76,443 | 0.0260 ug/L |
| NORWALK - CITY, WATER DEPT. | NORWALK | 20,283 | 0.0260 ug/L |
| SCWA - LAGUNA/VINEYARD | 184,896 | 0.0240 ug/L | |
| CERES, CITY OF | CERES | 54,513 | 0.0240 ug/L |
| TRACT 180 MUTUAL WATER CO. | 14,000 | 0.0240 ug/L | |
| LYNWOOD-CITY, WATER DEPT. | LYNWOOD | 66,967 | 0.0230 ug/L |
| PORTERVILLE, CITY OF | PORTERVILLE | 63,487 | 0.0230 ug/L |
| ORCHARD DALE WATER DISTRICT | 25,000 | 0.0230 ug/L | |
| HUNTINGTON PARK-CITY, WATER DEPT. | HUNTINGTON PARK | 15,437 | 0.0230 ug/L |
| CITY OF BELL GARDENS | BELL GARDENS | 11,437 | 0.0230 ug/L |
| HELENDALE COMMUNITY SERVICE DISTRICT | 6,347 | 0.0230 ug/L | |
| LA HABRA HEIGHTS CWD | 5,325 | 0.0230 ug/L | |
| CAL-WATER SERVICE CO.-CHICO | 114,925 | 0.0225 ug/L | |
| ATASCADERO MUTUAL WATER CO | 30,618 | 0.0223 ug/L | |
| GSWC-SOUTH ARCADIA | 27,072 | 0.0220 ug/L | |
| SOUTH MONTEBELLO IRRIGATION DIST. | 15,021 | 0.0201 ug/L | |
| CITY OF GARDEN GROVE | GARDEN GROVE | 174,226 | 0.0190 ug/L |
| RIVERSIDE HIGHLAND WATER COMPANY | 20,188 | 0.0190 ug/L | |
| RUBIO CANON LAND & WATER ASSOCIATION | 9,215 | 0.0190 ug/L | |
| WEAVERVILLE C.S.D. | 3,975 | 0.0190 ug/L | |
| GOLDEN HILLS CSD | 9,857 | 0.0186 ug/L | |
| POMONA - CITY, WATER DEPT. | POMONA | 151,713 | 0.0180 ug/L |
| COLTON, CITY OF | COLTON | 46,525 | 0.0180 ug/L |
| CITY OF ORANGE | ORANGE | 120,770 | 0.0170 ug/L |
| COMPTON-CITY, WATER DEPT. | COMPTON | 74,877 | 0.0170 ug/L |
| BELLFLOWER - SOMERSET MWC | 46,300 | 0.0170 ug/L | |
| CITY OF LATHROP | LATHROP | 35,080 | 0.0170 ug/L |
| CAMROSA WATER DISTRICT | 32,700 | 0.0170 ug/L | |
| LIBERTY UTILITIES - LYNWOOD | 24,701 | 0.0170 ug/L | |
| SANTA CLARITA VALLEY WATER AGENCY | 294,090 | 0.0169 ug/L | |
| LAKEWOOD - CITY, WATER DEPT. | LAKEWOOD | 66,135 | 0.0167 ug/L |
| CITY OF REDDING | REDDING | 89,628 | 0.0162 ug/L |
| RANCHO CALIFORNIA WATER DISTRICT | 146,147 | 0.0160 ug/L | |
| GOLDEN STATE WC - WEST ORANGE COUNTY | 114,379 | 0.0160 ug/L | |
| SUBURBAN WATER SYSTEMS-LA MIRADA | 56,793 | 0.0160 ug/L | |
| GLENDALE-CITY, WATER DEPT. | GLENDALE | 188,784 | 0.0158 ug/L |
| GSWC - BELL, BELL GARDENS | 55,050 | 0.0150 ug/L | |
| CAL AM - PARKWAY | 50,573 | 0.0147 ug/L | |
| LOS OSOS COMMUNITY SERVICES DISTRICT | 7,086 | 0.0147 ug/L | |
| PLANADA CSD | 4,164 | 0.0147 ug/L | |
| CITY OF SANTA ANA | SANTA ANA | 310,539 | 0.0142 ug/L |
| CWS - BAKERSFIELD | 267,881 | 0.0140 ug/L | |
| SANTA FE SPRINGS - CITY, WATER DEPT. | SANTA FE SPRINGS | 19,219 | 0.0140 ug/L |
| CALIFORNIA STATE FAIR | 9,280 | 0.0140 ug/L | |
| LAKE ARROWHEAD CSD | 7,038 | 0.0140 ug/L | |
| SAN JOAQUIN COUNTY-MOKELUMNE ACRES | 3,802 | 0.0135 ug/L | |
| CAL AM - SUBURBAN ROSEMONT | 54,793 | 0.0134 ug/L | |
| CITY OF FULLERTON | FULLERTON | 139,461 | 0.0133 ug/L |
| SUBURBAN WATER SYSTEMS-WHITTIER | 66,045 | 0.0130 ug/L | |
| GSWC - ARTESIA | 50,415 | 0.0130 ug/L | |
| GSWC - CLAREMONT | 39,730 | 0.0129 ug/L | |
| CALISTOGA, CITY OF | CALISTOGA | 5,610 | 0.0122 ug/L |
| EAST VALLEY WATER DISTRICT | 108,629 | 0.0120 ug/L | |
| CALIFORNIA WATER SERVICE - LIVERMORE | 60,414 | 0.0120 ug/L | |
| CALIFORNIA STATE UNIVERSITY FRESNO | 41,000 | 0.0120 ug/L | |
| PINEDALE COUNTY WATER DISTRICT | 16,736 | 0.0120 ug/L | |
| RIPON, CITY OF | RIPON | 15,741 | 0.0120 ug/L |
| FLORIN COUNTY WATER DISTRICT | 7,831 | 0.0118 ug/L | |
| SWEETWATER AUTHORITY | 191,282 | 0.0114 ug/L | |
| MAYWOOD MUTUAL WATER CO. #1 | 5,500 | 0.0113 ug/L | |
| HESPERIA WD | 100,744 | 0.0111 ug/L | |
| LINDSAY, CITY OF | LINDSAY | 12,659 | 0.0110 ug/L |
| PLEASANT VALLEY MUTUAL WATER CO | 5,000 | 0.0110 ug/L | |
| CITY OF WHEATLAND | WHEATLAND | 4,124 | 0.0110 ug/L |
| CITY OF GRIDLEY | GRIDLEY | 7,269 | 0.0105 ug/L |
| CITY OF VACAVILLE | VACAVILLE | 99,650 | 0.0100 ug/L |
| CITY OF ARCADIA | ARCADIA | 51,361 | 0.0100 ug/L |
| BIG BEAR CITY CSD | BIG BEAR CITY | 12,738 | 0.0099 ug/L |
| GUADALUPE VALLEY MID | 1,472 | 0.0096 ug/L | |
| COMMERCE-CITY, WATER DEPT. | MONTEBELLO | 4,205 | 0.0093 ug/L |
| CITY OF MERCED | MERCED | 93,692 | 0.0089 ug/L |
| Rincon Northern | 7,003 | 0.0089 ug/L | |
| CALIFORNIA WATER SERVICE CO. - ELA | 152,474 | 0.0086 ug/L | |
| CAL AM - MEADOWBROOK | 5,656 | 0.0083 ug/L | |
| CAL AM WATER COMPANY - MONTEREY | 92,450 | 0.0081 ug/L | |
| CITY OF GILROY | GILROY | 59,203 | 0.0080 ug/L |
| YOSEMITE SPRING PARK UTIL CO | 5,300 | 0.0079 ug/L | |
| AZUSA LIGHT AND WATER | 110,044 | 0.0077 ug/L | |
| BAKERSFIELD, CITY OF | BAKERSFIELD | 160,144 | 0.0076 ug/L |
| UKIAH, CITY OF | UKIAH | 16,607 | 0.0074 ug/L |
| CITY OF RED BLUFF | RED BLUFF | 14,710 | 0.0074 ug/L |