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 |
|---|---|---|---|
| MCL | Health-based | Archived | 1998-12-01 → 1998-12-31 |
| MCL | Health-based | Archived | 1998-12-01 → 1998-12-31 |
| MCL | Health-based | Archived | 1998-12-01 → 1998-12-31 |
| RPT | Monitoring | Unaddressed | 2025-07-02 |
| MR | Monitoring | Resolved | 2008-04-01 |
| MR | Monitoring | Resolved | 2008-04-01 |
| MR | Monitoring | Resolved | 2006-10-01 |
| Other | Monitoring | Resolved | 2003-07-01 |
| MR | Monitoring | Resolved | 2001-11-01 → 2001-11-30 |
| MR | Monitoring | Resolved | 2001-11-01 → 2001-11-30 |
PFAS detected
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| Pfba | 0.0091 µg/L | 6/8 | 2024 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromodichloromethane | 24 µg/L No EPA limit set
worst single sample: 26.8 µg/L | 46/49 | SYR4 | 2013–2019 |
| Chloroform | 39.425 µg/L No EPA limit set
worst single sample: 57.1 µg/L | 46/49 | SYR4 | 2013–2019 |
| TTHM | 75.5 µg/L 94% of the EPA limit 80 µg/L
worst single sample: 96.8 µg/L | 46/49 | SYR4 | 2013–2019 |
| Dichloroacetic Acid | 17.8 µg/L No EPA limit set
worst single sample: 23.4 µg/L | 45/49 | SYR4 | 2013–2019 |
| Total Haloacetic Acids (HAA5) | 29.96 µg/L 50% of the EPA limit 60 µg/L
worst single sample: 35 µg/L | 45/49 | SYR4 | 2013–2019 |
| Bromoform | 3.66 µg/L No EPA limit set
worst single sample: 3.97 µg/L | 44/49 | SYR4 | 2013–2019 |
| Dibromochloromethane | 15.835 µg/L No EPA limit set
worst single sample: 17.6 µg/L | 44/49 | SYR4 | 2013–2019 |
| Trichloroacetic Acid | 5.208 µg/L No EPA limit set
worst single sample: 8.27 µg/L | 44/49 | SYR4 | 2013–2019 |
| Dibromoacetic Acid | 4.777 µg/L No EPA limit set
worst single sample: 5.34 µg/L | 43/49 | SYR4 | 2013–2019 |
| Copper | 159.1 µg/L 12% of the EPA limit 1300 µg/L
worst single sample: 363 µg/L | 40/40 | SYR4 | 2014–2017 |
| Lead | 0.0014 mg/L 9.5% of the EPA limit 0.0150 mg/L | 22/22 | LCR | 2023 |
| Monobromoacetic Acid | 9.48 µg/L No EPA limit set
worst single sample: 9.98 µg/L | 9/49 | SYR4 | 2013–2019 |
| Lead | 18.484 µg/L 123% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 23.5 µg/L | 7/40 | SYR4 | 2014–2017 |
| Lithium | 22 µg/L No EPA limit set | 7/8 | UCMR-5 | 2024 |
| Monochloroacetic Acid | 9.78 µg/L No EPA limit set | 1/49 | SYR4 | 2013–2019 |
28 contaminants tested, none detected
Utility contact
Frequently asked questions about Herculaneum
Is Herculaneum tap water safe to drink?
EPA monitoring detected 16 contaminants in Herculaneum'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 Herculaneum's water?
EPA monitoring detected Bromodichloromethane, Chloroform, TTHM, Dichloroacetic Acid, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does Herculaneum serve?
Herculaneum reports serving 5,000 people in Missouri, per its EPA record.
Has Herculaneum had any water quality violations?
The EPA has 12 violations on file for Herculaneum, of which 3 are health-based (a contaminant limit or required treatment was breached) and 1 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.