CITY OF STOCKTON
CA · PWS ID CA3910012 · Community water system
113
contaminants tested
27
detected
191,302
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFOS | 0.0048 ug/L | 2/35 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 140 UG/L | 604/633 | SYR4 | 2012–2019 |
| Chloroform | 120 UG/L | 597/619 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 96.3 UG/L | 593/613 | SYR4 | 2012–2019 |
| Bromodichloromethane | 39 UG/L | 585/619 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 43 UG/L | 584/613 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 65.5 UG/L | 578/613 | SYR4 | 2012–2019 |
| Dibromochloromethane | 57 UG/L | 371/619 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 22 UG/L | 266/613 | SYR4 | 2012–2019 |
| Nitrate | 7006 UG/L | 266/322 | SYR4 | 2012–2019 |
| Bromoform | 57 UG/L | 215/619 | SYR4 | 2012–2019 |
| Monochloroacetic acid | 18.3 UG/L | 203/613 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 2.1 UG/L | 132/613 | SYR4 | 2012–2019 |
| Arsenic | 9 UG/L | 50/77 | SYR4 | 2012–2019 |
| Barium | 400 UG/L | 50/77 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0050 mg/L | 35/35 | LCR | 2026 |
| Bromate | 36 UG/L | 24/89 | SYR4 | 2012–2019 |
| Combined Uranium | 19.221 UG/L | 21/21 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 840000 UG/L | 16/37 | SYR4 | 2012–2019 |
| Fluoride | 200 UG/L | 11/75 | SYR4 | 2012–2019 |
| Lead | 35 UG/L | 7/78 | SYR4 | 2012–2019 |
| Chromium | 12 UG/L | 3/77 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 1.44 PCI/L | 3/4 | SYR4 | 2012 |
| COPPER, FREE | 560 UG/L | 2/75 | SYR4 | 2012–2019 |
| Selenium | 5.9 UG/L | 2/77 | SYR4 | 2012–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0100 UG/L | 1/61 | SYR4 | 2012–2019 |
| Trichloroethylene | 0.6100 UG/L | 1/71 | SYR4 | 2012–2019 |
86 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalAsbestosAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBAPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFHxSPFMBAPFMPAPFNAPFOAPFPeAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethylenelithiumo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene
Areas served
STOCKTON