ONTARIO, CITY OF
OR · PWS ID OR4100587 · Community water system
103
contaminants tested
14
detected
14,465
people served
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 83.4 UG/L | 124/124 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 47.3 UG/L | 122/124 | SYR4 | 2012–2019 |
| COPPER, FREE | 367 UG/L | 76/152 | SYR4 | 2014–2018 |
| LEAD SUMMARY | 0.0180 mg/L | 26/26 | LCR | 2024 |
| Lead | 7.41 UG/L | 23/152 | SYR4 | 2014–2018 |
| Nitrate | 2020 UG/L | 18/20 | SYR4 | 2012–2019 |
| Arsenic | 5.14 UG/L | 5/11 | SYR4 | 2012–2019 |
| Combined Uranium | 2.9 UG/L | 4/4 | SYR4 | 2013–2019 |
| lithium | 38.4 ug/L | 4/4 | UCMR-5 | 2025 |
| Barium | 61.1 UG/L | 3/3 | SYR4 | 2014–2019 |
| Fluoride | 718 UG/L | 3/3 | SYR4 | 2014–2019 |
| Chromium | 1.29 UG/L | 2/3 | SYR4 | 2014–2019 |
| Nitrate-Nitrite | 1150 UG/L | 2/3 | SYR4 | 2014–2019 |
| Gross Alpha, Excl. Radon and U | 3.13 PCI/L | 1/4 | SYR4 | 2014–2019 |
89 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalAsbestosAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneCombined Radium (-226 and -228)DICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBAPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFHxSPFMBAPFMPAPFNAPFOAPFOSPFPeAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene