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 | Unaddressed | 2025-12-30 |
| RPT | Monitoring | Unaddressed | 2025-07-02 |
| MR | Monitoring | Resolved | 2022-10-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2022-10-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2022-10-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2022-10-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2022-10-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2022-10-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2022-10-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2022-10-01 → 2022-12-31 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 25.575 µg/L 32% of the EPA limit 80 µg/L
worst single sample: 30.9 µg/L | 294/294 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 33.7 µg/L 56% of the EPA limit 60 µg/L
worst single sample: 42.73 µg/L | 293/294 | SYR4 | 2012–2019 |
| Copper | 43.6479 µg/L 3.4% of the EPA limit 1300 µg/L
worst single sample: 148.532 µg/L | 134/137 | SYR4 | 2012–2019 |
| Bromodichloromethane | 4.996 µg/L No EPA limit set
worst single sample: 9.69 µg/L | 93/93 | SYR4 | 2012–2019 |
| Chloroform | 20.44 µg/L No EPA limit set
worst single sample: 29 µg/L | 93/93 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 28.65 µg/L No EPA limit set
worst single sample: 35.68 µg/L | 66/66 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 3.636 µg/L No EPA limit set
worst single sample: 3.82 µg/L | 65/66 | SYR4 | 2012–2019 |
| Nitrate | 4067.5 µg/L 41% of the EPA limit 10000 µg/L
worst single sample: 4120 µg/L | 36/36 | SYR4 | 2012–2019 |
| Chromium | 1.735 µg/L 1.7% of the EPA limit 100 µg/L
worst single sample: 1.82 µg/L | 31/31 | SYR4 | 2012–2019 |
| Dibromochloromethane | 1.5565 µg/L No EPA limit set
worst single sample: 1.64 µg/L | 28/93 | SYR4 | 2012–2019 |
| Lead | 6.0613 µg/L 40% of the EPA limit 15 µg/L
worst single sample: 6.677 µg/L | 28/137 | SYR4 | 2012–2019 |
| Atrazine | 1.315 µg/L 44% of the EPA limit 3 µg/L
worst single sample: 1.56 µg/L | 26/68 | SYR4 | 2012–2019 |
| Lead | 0.0018 mg/L 12% of the EPA limit 0.0150 mg/L | 20/20 | LCR | 2025 |
| Nitrate-Nitrite | 4092 µg/L 41% of the EPA limit 10000 µg/L
worst single sample: 4160 µg/L | 18/18 | SYR4 | 2012–2019 |
| Barium | 25.3265 µg/L 1.3% of the EPA limit 2000 µg/L
worst single sample: 27.79 µg/L | 14/15 | SYR4 | 2012–2019 |
| Fluoride | 650 µg/L 16% of the EPA limit 4000 µg/L | 14/14 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 6.6834 µg/L No EPA limit set
worst single sample: 7.009 µg/L | 12/66 | SYR4 | 2012–2019 |
| Arsenic | 1.05 µg/L 11% of the EPA limit 10 µg/L
worst single sample: 1.12 µg/L | 8/15 | SYR4 | 2012–2019 |
| Simazine | 1.0555 µg/L 26% of the EPA limit 4 µg/L
worst single sample: 1.08 µg/L | 8/68 | SYR4 | 2012–2019 |
| Lithium | 45.3 µg/L No EPA limit set | 8/8 | UCMR-5 | 2024 |
| Nitrite | 37.55 µg/L 3.8% of the EPA limit 1000 µg/L
worst single sample: 39.5 µg/L | 7/18 | SYR4 | 2012–2019 |
| Selenium | 2.4296 µg/L 4.9% of the EPA limit 50 µg/L
worst single sample: 2.588 µg/L | 7/15 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 4.9795 µg/L No EPA limit set
worst single sample: 5.63 µg/L | 6/66 | SYR4 | 2012–2019 |
| Antimony, Total | 0.3840 µg/L 6.4% of the EPA limit 6 µg/L
worst single sample: 0.3900 µg/L | 5/15 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2.8958 µg/L No EPA limit set
worst single sample: 2.972 µg/L | 5/66 | SYR4 | 2012–2019 |
77 contaminants tested, none detected
Utility contact
Frequently asked questions about St Louis City
Is St Louis City tap water safe to drink?
EPA monitoring detected 25 contaminants in St Louis City'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 Louis City's water?
EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Copper, Bromodichloromethane, Chloroform, and others. The full list with the level and data source for each is above.
How many people does St Louis City serve?
St Louis City reports serving 304,709 people in Missouri, per its EPA record.
Has St Louis City had any water quality violations?
The EPA has 28 violations on file for St Louis City, of which 0 are health-based (a contaminant limit or required treatment was breached) and 2 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.