Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
| Violation | Type | Status | Period |
|---|---|---|---|
| MR | Monitoring | Resolved | 2024-10-01 |
| Other | Monitoring | Resolved | 2012-07-01 |
| Other | Monitoring | Resolved | 2006-07-01 |
| Other | Monitoring | Resolved | 2003-07-01 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Chloroform | 20.36 µg/L No EPA limit set
worst single sample: 33.8 µg/L | 117/123 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 27.87 µg/L No EPA limit set
worst single sample: 37.7 µg/L | 114/117 | SYR4 | 2012–2019 |
| TTHM | 22.79 µg/L 28% of the EPA limit 80 µg/L
worst single sample: 35.6 µg/L | 112/119 | SYR4 | 2012–2019 |
| Bromodichloromethane | 2.2625 µg/L No EPA limit set
worst single sample: 3.48 µg/L | 96/123 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 4.0795 µg/L No EPA limit set
worst single sample: 4.64 µg/L | 82/117 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 35.2 µg/L 59% of the EPA limit 60 µg/L
worst single sample: 41.8 µg/L | 81/117 | SYR4 | 2012–2019 |
| Copper | 21.76 µg/L 1.7% of the EPA limit 1300 µg/L
worst single sample: 51.1 µg/L | 55/92 | SYR4 | 2012–2018 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 25/25 | LCR | 2024 |
| Chromium | 1.9105 µg/L 1.9% of the EPA limit 100 µg/L
worst single sample: 2.06 µg/L | 14/14 | SYR4 | 2013–2017 |
| Lithium | 45.1 µg/L No EPA limit set | 6/6 | UCMR-5 | 2024 |
| Dibromochloromethane | 0.6400 µg/L No EPA limit set
worst single sample: 0.6500 µg/L | 5/123 | SYR4 | 2012–2019 |
| Lead | 4.374 µg/L 29% of the EPA limit 15 µg/L
worst single sample: 4.71 µg/L | 5/92 | SYR4 | 2012–2018 |
| Dibromoacetic Acid | 1.238 µg/L No EPA limit set
worst single sample: 1.25 µg/L | 4/117 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 20 µg/L 0.2% of the EPA limit 10000 µg/L | 4/16 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 7.34 µg/L No EPA limit set
worst single sample: 7.78 µg/L | 3/117 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 11.076 µg/L No EPA limit set
worst single sample: 11.6 µg/L | 3/117 | SYR4 | 2012–2019 |
| Barium | 77.525 µg/L 3.9% of the EPA limit 2000 µg/L
worst single sample: 77.8 µg/L | 2/2 | SYR4 | 2014–2017 |
| Fluoride | 519 µg/L 13% of the EPA limit 4000 µg/L
worst single sample: 520 µg/L | 2/2 | SYR4 | 2014–2017 |
| Bromoform | 0.5400 µg/L No EPA limit set | 1/123 | SYR4 | 2012–2019 |
79 contaminants tested, none detected
Utility contact
Frequently asked questions about St Charles
Is St Charles tap water safe to drink?
EPA monitoring detected 19 contaminants in St Charles's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in St Charles's water?
EPA monitoring detected Chloroform, Dichloroacetic Acid, TTHM, Bromodichloromethane, Trichloroacetic Acid, and others. The full list with the level and data source for each is above.
How many people does St Charles serve?
St Charles reports serving 78,961 people in Missouri, per its EPA record.
Has St Charles had any water quality violations?
The EPA has 4 violations on file for St Charles, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.