NORWALK - CITY, WATER DEPT.
CA · PWS ID CA1910191 · Community water system
111
contaminants tested
23
detected
20,283
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFHxS | 0.0076 ug/L | 4/20 | 2024 |
| PFOA | 0.0052 ug/L | 4/20 | 2024 |
| PFOS | 0.0260 ug/L | 4/20 | 2024 |
| PFBA | 0.0056 ug/L | 2/20 | 2024 |
| PFPeA | 0.0034 ug/L | 1/20 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromoform | 17 UG/L | 223/224 | SYR4 | 2012–2019 |
| TTHM | 55.2 UG/L | 223/224 | SYR4 | 2012–2019 |
| Dibromochloromethane | 20.3 UG/L | 200/224 | SYR4 | 2012–2019 |
| Bromodichloromethane | 16.5 UG/L | 165/224 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 26.8 UG/L | 162/224 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 7.8 UG/L | 150/224 | SYR4 | 2012–2019 |
| Chloroform | 24 UG/L | 121/224 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 17.4 UG/L | 103/224 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 7.3 UG/L | 70/224 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0120 mg/L | 42/42 | LCR | 2022 |
| Tetrachloroethylene | 3.8 UG/L | 41/90 | SYR4 | 2012–2019 |
| Trichloroethylene | 3.2 UG/L | 39/90 | SYR4 | 2012–2019 |
| Nitrate | 3616 UG/L | 32/46 | SYR4 | 2012–2019 |
| Arsenic | 3.9 UG/L | 23/30 | SYR4 | 2012–2019 |
| lithium | 59 ug/L | 16/20 | UCMR-5 | 2024 |
| Fluoride | 390 UG/L | 8/8 | SYR4 | 2012–2019 |
| Combined Uranium | 8.642 UG/L | 4/14 | SYR4 | 2012–2019 |
| Barium | 120 UG/L | 1/8 | SYR4 | 2012–2019 |
88 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalAsbestosAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECOPPER, FREECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneChromiumDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOLeadMercuryMethoxychlorMonobromoacetic acidMonochloroacetic acidNEtFOSAANFDHANMeFOSAANitrate-NitriteNitriteOXAMYLPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene
Areas served
NORWALK