CALIFORNIA WATER SERVICE - STOCKTON
CA · PWS ID CA3910001 · Community water system
112
contaminants tested
33
detected
176,266
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFOS | 0.0052 ug/L | 2/25 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 11937 UG/L | 2086/2628 | SYR4 | 2012–2019 |
| TTHM | 108.7 UG/L | 720/890 | SYR4 | 2012–2019 |
| Chloroform | 95.89 UG/L | 718/894 | SYR4 | 2012–2019 |
| Bromodichloromethane | 13.31 UG/L | 702/925 | SYR4 | 2012–2019 |
| Arsenic | 28.711 UG/L | 619/883 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 19 UG/L | 242/250 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 49 UG/L | 240/250 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 35 UG/L | 240/250 | SYR4 | 2012–2019 |
| Barium | 290 UG/L | 109/160 | SYR4 | 2012–2019 |
| Combined Uranium | 12.9183 UG/L | 109/189 | SYR4 | 2012–2019 |
| Dibromochloromethane | 4.1 UG/L | 107/928 | SYR4 | 2012–2019 |
| Lead | 19.036 UG/L | 98/232 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 1.86 UG/L | 92/807 | SYR4 | 2012–2019 |
| Trichloroethylene | 4.84 UG/L | 92/807 | SYR4 | 2012–2019 |
| COPPER, FREE | 128.6 UG/L | 83/680 | SYR4 | 2012–2019 |
| Antimony, Total | 0.2010 UG/L | 81/219 | SYR4 | 2012–2019 |
| Selenium | 1.299 UG/L | 73/221 | SYR4 | 2012–2019 |
| Chromium | 21.542 UG/L | 67/203 | SYR4 | 2012–2019 |
| Cadmium | 0.1820 UG/L | 33/225 | SYR4 | 2012–2019 |
| Beryllium, Total | 0.1960 UG/L | 30/198 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0050 mg/L | 29/29 | LCR | 2024 |
| Nitrate-Nitrite | 11000 UG/L | 15/26 | SYR4 | 2015–2019 |
| 1,2-Dichloropropane | 0.6100 UG/L | 14/807 | SYR4 | 2012–2019 |
| Thallium, Total | 0.0580 UG/L | 13/202 | SYR4 | 2012–2019 |
| Fluoride | 140 UG/L | 12/67 | SYR4 | 2012–2019 |
| Xylenes, Total | 1.3 UG/L | 6/804 | SYR4 | 2012–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0100 UG/L | 3/220 | SYR4 | 2012–2018 |
| Bromoform | 1.01 UG/L | 3/926 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 5.7 PCI/L | 2/2 | SYR4 | 2015–2019 |
| Monochloroacetic acid | 2.6 UG/L | 2/250 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 1.1 UG/L | 1/250 | SYR4 | 2012–2019 |
| Mercury | 0.0460 UG/L | 1/69 | SYR4 | 2012–2019 |
79 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAsbestosAtrazineBHC-GAMMABenzeneBenzo(a)pyreneCHLOROBENZENECYANIDECarbofuranCarbon tetrachlorideChlordaneDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMethoxychlorMonobromoacetic acidNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBAPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFHxSPFMBAPFMPAPFNAPFOAPFPeAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSimazineStyreneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl chloridecis-1,2-Dichloroethylenelithiumo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene