ST CHARLES COUNTY PWSD 2
MO · PWS ID MO6024530 · Community water system
102
contaminants tested
23
detected
100,587
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFBA | 0.0065 ug/L | 2/9 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromodichloromethane | 12.3 UG/L | 163/166 | SYR4 | 2012–2019 |
| Chloroform | 50.1 UG/L | 163/166 | SYR4 | 2012–2019 |
| TTHM | 53 UG/L | 160/161 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 36.3 UG/L | 159/161 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 10.1 UG/L | 152/161 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 41.7 UG/L | 149/161 | SYR4 | 2012–2019 |
| Dibromochloromethane | 5.03 UG/L | 129/166 | SYR4 | 2012–2019 |
| COPPER, FREE | 145 UG/L | 92/94 | SYR4 | 2013–2019 |
| Dibromoacetic acid | 2.14 UG/L | 43/161 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 10.4 UG/L | 26/161 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 1610 UG/L | 26/36 | SYR4 | 2012–2019 |
| Bromoform | 0.7300 UG/L | 24/166 | SYR4 | 2012–2019 |
| Chromium | 2.62 UG/L | 17/17 | SYR4 | 2013–2017 |
| LEAD SUMMARY | 0.0130 mg/L | 17/17 | LCR | 2025 |
| Lead | 3.73 UG/L | 15/94 | SYR4 | 2013–2019 |
| Combined Radium (-226 and -228) | 3.3 PCI/L | 12/13 | SYR4 | 2014–2019 |
| Gross Alpha, Excl. Radon and U | 15 PCI/L | 11/12 | SYR4 | 2014–2015 |
| lithium | 47.5 ug/L | 9/9 | UCMR-5 | 2025 |
| Barium | 147 UG/L | 5/5 | SYR4 | 2014–2017 |
| Fluoride | 640 UG/L | 5/5 | SYR4 | 2014–2017 |
| Atrazine | 0.3300 UG/L | 1/3 | SYR4 | 2016 |
| Monochloroacetic acid | 9.7 UG/L | 1/161 | SYR4 | 2012–2019 |
79 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, TotalArsenicBHC-GAMMABenzeneBeryllium, TotalCHLOROBENZENECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneCombined UraniumDICHLOROMETHANEDalaponDinosebETHYLENE DIBROMIDEEndrinEthylbenzeneHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorNEtFOSAANFDHANMeFOSAAOXAMYLPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFHxSPFMBAPFMPAPFNAPFOAPFOSPFPeAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene