ONTARIO MUNICIPAL UTILITIES COMPANY
CA · PWS ID CA3610034 · Community water system
110
contaminants tested
27
detected
185,010
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFBA | 0.0064 ug/L | 2/36 | 2024 |
| PFPeA | 0.0067 ug/L | 2/36 | 2024 |
| PFHxA | 0.0071 ug/L | 1/36 | 2024 |
| PFHxS | 0.0042 ug/L | 1/36 | 2024 |
| PFOA | 0.0300 ug/L | 1/36 | 2024 |
| PFOS | 0.0052 ug/L | 1/36 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 14000 UG/L | 1814/1956 | SYR4 | 2012–2019 |
| TTHM | 77 UG/L | 171/201 | SYR4 | 2012–2019 |
| Chloroform | 30 UG/L | 168/214 | SYR4 | 2012–2019 |
| Bromodichloromethane | 23 UG/L | 158/214 | SYR4 | 2012–2019 |
| Dibromochloromethane | 28 UG/L | 158/214 | SYR4 | 2012–2019 |
| Bromoform | 29 UG/L | 151/214 | SYR4 | 2012–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.1600 UG/L | 135/186 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 43 UG/L | 116/201 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 13 UG/L | 104/201 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 5.6 UG/L | 100/201 | SYR4 | 2012–2019 |
| Fluoride | 500 UG/L | 92/93 | SYR4 | 2012–2019 |
| Chromium | 8.8 UG/L | 86/87 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 7.8 UG/L | 80/201 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 7.8 UG/L | 69/201 | SYR4 | 2012–2019 |
| Monochloroacetic acid | 31 UG/L | 36/201 | SYR4 | 2012–2019 |
| Barium | 140 UG/L | 22/87 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0050 mg/L | 21/21 | LCR | 2024 |
| Nitrite | 4900 UG/L | 16/87 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 12000 UG/L | 13/13 | SYR4 | 2017 |
| Arsenic | 2.4 UG/L | 3/87 | SYR4 | 2012–2019 |
| ETHYLENE DIBROMIDE | 0.0210 UG/L | 1/127 | SYR4 | 2012–2019 |
83 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, TotalCHLOROBENZENECOPPER, FREECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOLeadMercuryMethoxychlorNEtFOSAANFDHANMeFOSAAOXAMYLPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethylenelithiumo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene
Areas served
ONTARIO