DOWNEY - CITY, WATER DEPT.
CA · PWS ID CA1910034 · Community water system
75
contaminants tested
21
detected
110,556
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFBS | 0.0089 ug/L | 10/10 | 2025 |
| PFHxA | 0.0210 ug/L | 10/10 | 2025 |
| PFOA | 0.0150 ug/L | 10/10 | 2025 |
| PFOS | 0.0440 ug/L | 10/10 | 2025 |
| PFPeA | 0.0270 ug/L | 10/10 | 2025 |
| PFHxS | 0.0089 ug/L | 9/10 | 2025 |
| PFBA | 0.0100 ug/L | 8/10 | 2025 |
| PFHpA | 0.0042 ug/L | 4/10 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 4900 UG/L | 310/316 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 4900 UG/L | 74/77 | SYR4 | 2016–2019 |
| LEAD SUMMARY | 0.0130 mg/L | 72/72 | LCR | 2023 |
| Tetrachloroethylene | 3.7 UG/L | 70/279 | SYR4 | 2012–2019 |
| Fluoride | 430 UG/L | 54/54 | SYR4 | 2012–2019 |
| Combined Uranium | 5.662 UG/L | 22/29 | SYR4 | 2016–2018 |
| Trichloroethylene | 1.4 UG/L | 22/178 | SYR4 | 2012–2019 |
| Arsenic | 3.5 UG/L | 19/54 | SYR4 | 2012–2019 |
| Barium | 120 UG/L | 5/55 | SYR4 | 2012–2019 |
| cis-1,2-Dichloroethylene | 0.6600 UG/L | 3/159 | SYR4 | 2012–2019 |
| Antimony, Total | 13 UG/L | 1/56 | SYR4 | 2012–2019 |
| COPPER, FREE | 200 UG/L | 1/54 | SYR4 | 2012–2019 |
| Lead | 25 UG/L | 1/56 | SYR4 | 2012–2019 |
54 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAtrazineBenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECYANIDECadmiumCarbon tetrachlorideChromiumDICHLOROMETHANEDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateEthylbenzeneHFPO-DALASSOMercuryNEtFOSAANFDHANMeFOSAANitritePFDAPFDoAPFEESAPFHpSPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnASeleniumSimazineStyreneThallium, TotalTolueneVinyl chlorideXylenes, Totallithiumo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene
Areas served
DOWNEY