ATASCADERO MUTUAL WATER CO
CA · PWS ID CA4010002 · Community water system
84
contaminants tested
26
detected
30,618
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 | 6/8 | 2023 |
| PFBS | 0.0094 ug/L | 4/8 | 2023 |
| PFOS | 0.0223 ug/L | 4/8 | 2023 |
| PFBA | 0.0100 ug/L | 2/8 | 2023 |
| PFOA | 0.0084 ug/L | 2/8 | 2023 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 4600 UG/L | 608/726 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 9.7 UG/L | 181/181 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 27.2 UG/L | 181/181 | SYR4 | 2012–2019 |
| Bromodichloromethane | 25 UG/L | 175/181 | SYR4 | 2012–2019 |
| Bromoform | 10.1 UG/L | 175/181 | SYR4 | 2012–2019 |
| Chloroform | 22.8 UG/L | 175/181 | SYR4 | 2012–2019 |
| TTHM | 68.8 UG/L | 175/181 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 12.6 UG/L | 170/170 | SYR4 | 2012–2019 |
| Dibromochloromethane | 24.3 UG/L | 169/176 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 4.7 UG/L | 111/122 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0072 mg/L | 69/69 | LCR | 2025 |
| Fluoride | 360 UG/L | 58/62 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 860000 UG/L | 30/38 | SYR4 | 2013–2019 |
| Combined Uranium | 19.37 UG/L | 19/21 | SYR4 | 2012–2019 |
| Selenium | 10 UG/L | 14/51 | SYR4 | 2012–2019 |
| lithium | 20.7 ug/L | 6/8 | UCMR-5 | 2023 |
| Barium | 130 UG/L | 5/51 | SYR4 | 2012–2019 |
| Arsenic | 3.4 UG/L | 4/51 | SYR4 | 2012–2019 |
| Cadmium | 2.6 UG/L | 3/51 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 1 UG/L | 3/33 | SYR4 | 2012–2019 |
| Monochloroacetic acid | 2.7 UG/L | 2/32 | SYR4 | 2012–2019 |
58 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-PF3ONSADONAAntimony, TotalAtrazineBenzeneBeryllium, TotalCHLOROBENZENECOPPER, FREECYANIDECarbon tetrachlorideChromiumDICHLOROMETHANEEthylbenzeneGlyphosateHFPO-DALASSOLeadMercuryNEtFOSAANFDHANMeFOSAANitritePFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFMBAPFMPAPFNAPFPeAPFPeSPFTAPFTrDAPFUnASimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene