LOS OSOS COMMUNITY SERVICES DISTRICT
CA · PWS ID CA4010016 · Community water system
92
contaminants tested
22
detected
7,086
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFBS | 0.0180 ug/L | 3/14 | 2024 |
| PFHxA | 0.0166 ug/L | 3/14 | 2024 |
| PFOA | 0.0147 ug/L | 3/14 | 2024 |
| PFPeA | 0.0168 ug/L | 3/14 | 2024 |
| PFHpA | 0.0054 ug/L | 2/14 | 2024 |
| PFBA | 0.0060 ug/L | 1/14 | 2024 |
| PFHxS | 0.0084 ug/L | 1/14 | 2024 |
| PFOS | 0.0117 ug/L | 1/14 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 17600 UG/L | 546/592 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0070 mg/L | 47/47 | LCR | 2026 |
| Fluoride | 220 UG/L | 14/30 | SYR4 | 2012–2019 |
| Barium | 190 UG/L | 11/19 | SYR4 | 2013–2019 |
| Bromoform | 5.8 UG/L | 8/8 | SYR4 | 2013–2019 |
| TTHM | 7.6 UG/L | 8/8 | SYR4 | 2013–2019 |
| Dibromoacetic acid | 1.8 UG/L | 7/8 | SYR4 | 2013–2019 |
| Total Haloacetic Acids (HAA5) | 1.8 UG/L | 7/8 | SYR4 | 2013–2019 |
| Dibromochloromethane | 2.5 UG/L | 6/8 | SYR4 | 2013–2019 |
| Nitrate-Nitrite | 539000 UG/L | 6/9 | SYR4 | 2013–2017 |
| COPPER, FREE | 44 UG/L | 5/23 | SYR4 | 2012–2019 |
| lithium | 16.1 ug/L | 5/14 | UCMR-5 | 2024 |
| Chromium | 36 UG/L | 3/19 | SYR4 | 2013–2019 |
| Lead | 6.4 UG/L | 1/17 | SYR4 | 2013–2019 |
70 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalArsenicAsbestosAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalBromodichloromethaneCHLOROBENZENECYANIDECadmiumCarbon tetrachlorideChloroformDICHLOROMETHANEDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDichloroacetic AcidETHYLENE DIBROMIDEEthylbenzeneHEXACHLOROBENZENEHFPO-DAHexachlorocyclopentadieneLASSOMercuryMethoxychlorMonobromoacetic acidMonochloroacetic acidNEtFOSAANFDHANMeFOSAANitritePFDAPFDoAPFEESAPFHpSPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnASeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroacetic AcidTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene