California tap water
127 of 657 California water systems with full PFAS testing (19%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 2,765 active community water systems in the EPA file; 600 serve 3,300+ people and have a full PFAS set.
- 721 systems had at least one health-based violation since 2021-10-26.
- 21 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Los Angeles-City, dept. of Water & Power | 3,875,566 | No | 0 |
| East Bay Mud | 1,468,000 | No | 0 |
| San Diego, City of | 1,408,937 | No | 0 |
| San Jose Water | 1,039,920 | No | 1 |
| Sfpuc City Distribution Division | 848,019 | No | 0 |
| Eastern Municipal Wd | 659,923 | No | 0 |
| City of Fresno | 545,970 | Yes, at one or more sampling points | 0 |
| City of Sacramento Main | 527,979 | Yes, at one or more sampling points | 0 |
Counties
Los Angeles County109 systems with full PFAS testingSan Bernardino County44 systems with full PFAS testingRiverside County29 systems with full PFAS testingOrange County29 systems with full PFAS testingSacramento County27 systems with full PFAS testingKern County25 systems with full PFAS testingSan Diego County22 systems with full PFAS testingVentura County20 systems with full PFAS testingFresno County17 systems with full PFAS testingSanta Clara County15 systems with full PFAS testingSanta Barbara County15 systems with full PFAS testingSan Mateo County15 systems with full PFAS testingSan Luis Obispo County15 systems with full PFAS testingSonoma County13 systems with full PFAS testingStanislaus County12 systems with full PFAS testingMonterey County12 systems with full PFAS testingSan Joaquin County11 systems with full PFAS testingTulare County11 systems with full PFAS testingMerced County11 systems with full PFAS testing
All 207 utilities with a page in California
- Alameda County Water District 344,000
- Alco Water Service 56,253
- Azusa Light and Water 110,044
- Bakersfield, City of 171,108
- Beaumont Cherry Valley Wd 66,841
- Bellflower - Somerset Mwc 46,300
- Brentwood 64,513
- Burbank-City, Water dept. 106,146
- Cal Am - Lincoln Oaks 48,105
- Cal Am - Parkway 50,646
- Cal Am - Suburban Rosemont 54,893
- Cal Am Water Company - Monterey 128,928
- Cal American Water CO 66,809
- Cal-Water Service Co.-Chico 110,473
- Cal/Am Water Company - San Marino 48,065
- California Water Service - Bear Gulch 60,382
- California Water Service - Livermore 60,414
- California Water Service - San Mateo 103,536
- California Water Service - Stockton 182,775
- California Water Service CO. - Dominguez 149,490
- California Water Service CO. - Ela 142,140
- California Water Service CO. - Herm/Redo 100,072
- California Water Service CO. - Palos Ver 70,830
- California Water Service-S San Francisco 62,609
- Camarillo Water dept 47,701
- Camp Pendleton (South) 44,555
- Carlsbad Mwd 96,371
- Carmichael Water District 41,193
- Ceres, City of 54,513
- Cerritos - City, Water dept. 46,851
- Chino Hills, City of 76,314
- Chino, City of 90,187
- Citrus Heights Water District 67,818
- City of Alhambra 80,279
- City of Anaheim 350,254
- City of Antioch 116,781
- City of Arcadia 54,236
- City of Brea 47,454
- City of Buena Park 82,667
- City of Clovis 133,118
- City of Daly City 102,593
- City of Davis 67,826
- City of Fairfield 120,720
- City of Fountain Valley 56,747
- City of Fresno 545,970
- City of Fullerton 140,054
- City of Garden Grove 174,226
- City of Gilroy 59,426
- City of Hayward 162,954
- City of Huntington Beach 201,000
- City of LA Habra 61,202
- City of Lincoln 56,268
- City of Los Banos 48,896
- City of Madera 66,560
- City of Merced 96,073
- City of Milpitas 81,915
- City of Morgan Hill 47,374
- City of Mountain View 81,340
- City of Newport Beach 69,520
- City of Orange 120,770
- City of Palo Alto 67,658
- City of Pittsburg 62,500
- City of Pleasanton 76,689
- City of Redding 90,254
- City of Roseville 165,736
- City of Sacramento Main 527,979
- City of San Bruno 42,631
- City of San Clemente 51,545
- City of San Jose - Evg/Edv/Coy 99,783
- City of San Jose - Nsj/Alviso 48,082
- City of Santa Ana 316,184
- City of Santa Barbara Water department 93,334
- City of Santa Clara 134,587
- City of Santa Maria Utilities department 112,208
- City of Stockton 192,702
- City of Sunnyvale 157,566
- City of Thousand Oaks Water department 54,770
- City of Tustin 65,143
- City of Vacaville 99,650
- City of Vallejo 121,420
- City of Westminster 93,591
- City of Woodland 61,462
- City of Yuba City 70,256
- Coachella Vwd: Cove Community 270,000
- Coachella Water Authority 43,590
- Colton, City of 46,525
- Compton-City, Water dept. 90,986
- Contra Costa Water District 210,500
- Corona, City of 169,380
- Cucamonga Valley Water District 213,375
- CWS - Bakersfield 268,129
- CWS - Visalia 153,522
- Cwsc Los Altos Suburban 63,559
- Cwsc Salinas 114,286
- Delano, City of 51,428
- Desert Water Agency 75,588
- Downey - City, Water dept. 110,556
- Dublin San Ramon Services District 98,776
- East Bay Mud 1,468,000
- East Valley Water District 108,600
- Eastern Municipal Wd 659,923
- El Dorado Id - Main 128,408
- El Toro Water District 53,415
- Elk Grove Water District 44,065
- Elsinore Valley Mwd 169,455
- Folsom, City of - Main 80,969
- Glendale-City, Water dept. 192,212
- Glendora-City, Water dept. 44,411
- Golden State Water CO. - Cordova 47,366
- Golden State Water Company - Simi Valley 45,086
- Golden State Wc - Placentia/Yorba Linda 50,804
- Golden State Wc - West Orange County 114,693
- Goleta Water District 85,535
- Great Oaks Wc Inc 112,582
- Gswc - Artesia 50,415
- Gswc - Bell, Bell Gardens 55,050
- Gswc - Florence/Graham 63,472
- Gswc - Norwalk 43,167
- Gswc - Southwest 277,740
- Gswc-San Dimas 56,564
- Hanford, City of 62,127
- Hawthorne-City Water dept. 46,039
- Helix Water District 277,918
- Hesperia Wd 101,836
- Indian Wells Valley W.d. 41,474
- Indio Water Authority 89,137
- Inglewood- City, Water dept. 81,191
- Irvine Ranch Water District 450,323
- Jurupa Community Sd 134,638
- Lake Hemet Mwd 52,913
- Lakewood - City, Water dept. 66,356
- Las Virgenes Mwd 77,562
- Liberty Utilities - Bellflower-Norwalk 72,472
- Liberty Utilities (Av Ranchos) Corp. 63,381
- Lodi, City of 67,093
- Long Beach Utilities department 466,772
- Los Angeles Cwwd 40 Reg 4 & 34 Lancaster 208,129
- Los Angeles-City, dept. of Water & Power 3,875,566
- Lynwood-City, Water dept. 66,967
- Manteca, City of 84,928
- Marin Municipal Water District 188,116
- Mesa Water District 110,000
- Mission Springs Wd 43,484
- Modesto, City of 218,915
- Monte Vista Wd 56,390
- Monterey Park-City, Water dept. 61,096
- Moulton Niguel Water District 168,315
- North Marin Water District 61,691
- Oceanside, City of 174,340
- Oildale Mwc 45,315
- Olivenhain Mwd 86,458
- Ontario Municipal Utilities Company 185,010
- Otay Water District 242,155
- Oxnard Water dept 200,232
- Padre Dam Mwd 93,980
- Palmdale Water Dist. 126,804
- Paramount - City, Water dept. 55,200
- Pasadena Water and Power 165,448
- Petaluma, City of 61,427
- Placer Cwa - Foothill 93,417
- Pomona - City, Water dept. 151,713
- Porterville, City of 63,487
- Poway, City of 49,888
- Rancho California Water District 146,147
- Redlands City Mud-Water Div 78,025
- Rialto, City of 59,264
- Riverside, City of 302,776
- Rohnert Park, City of 43,821
- Rowland Water District 56,100
- Sacramento Suburban Water District 194,444
- San Bernardino City 214,665
- San Diego, City of 1,408,937
- San Gabriel Valley Water Co.-El Monte 240,000
- San Gabriel Valley Wc - Fontana 228,270
- San Jose Water 1,039,920
- San Luis Obispo Water department 49,534
- Santa Clarita Valley Water Agency 292,014
- Santa Cruz Water department 94,626
- Santa Margarita Water District 165,275
- Santa Monica-City, Water Division 90,729
- Santa Rosa, City of 178,452
- Scwa - Laguna/Vineyard 188,417
- Sfpuc City Distribution Division 848,019
- South Coast Water District 41,194
- South Gate-City, Water dept. 88,544
- Suburban Water Systems-La Mirada 57,240
- Suburban Water Systems-San Jose 170,523
- Suburban Water Systems-Whittier 66,565
- Sweetwater Authority 184,915
- Torrance-City, Water dept. 106,183
- Tracy, City of 98,215
- Tulare, City of 72,241
- Turlock, City of 72,888
- Upland, City of 78,376
- Vallecitos Wd 114,700
- Valley County Water Dist. 68,871
- Ventura Water department 112,285
- Ventura Wwd No. 8 - Simi Valley 94,736
- Victorville Water District 140,721
- Vista Irrigation District 134,501
- Walnut Valley Water District 100,941
- Watsonville, City of 65,231
- West Valley Water District 96,123
- Western Mwd 87,955
- Whittier-City, Water dept. 49,954
- Yorba Linda Water District 84,292
- Yucaipa Valley Water District 52,202
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.