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 |
|---|---|---|---|
| TT | Health-based | Unaddressed | 2024-10-17 |
| TT | Health-based | Unaddressed | 2024-10-17 |
| TT | Health-based | Unaddressed | 2024-10-17 |
| MCL | Health-based | Archived | 1998-02-01 → 1998-02-28 |
| MCL | Health-based | Archived | 1998-02-01 → 1998-02-28 |
| MCL | Health-based | Archived | 1998-02-01 → 1998-02-28 |
| MCL | Health-based | Archived | 1998-02-01 → 1998-02-28 |
| MCL | Health-based | Archived | 1993-08-01 → 1993-08-31 |
| MCL | Health-based | Archived | 1993-08-01 → 1993-08-31 |
| MCL | Health-based | Archived | 1993-08-01 → 1993-08-31 |
PFAS detected
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| Pfba | 0.0058 µg/L | 2/4 | 2024 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromodichloromethane | 12.93 µg/L No EPA limit set | 52/52 | SYR4 | 2012–2019 |
| Chloroform | 56 µg/L No EPA limit set | 52/52 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 24.4 µg/L No EPA limit set | 52/52 | SYR4 | 2012–2019 |
| TTHM | 66.87 µg/L 84% of the EPA limit 80 µg/L | 52/52 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 39.8 µg/L 66% of the EPA limit 60 µg/L | 52/52 | SYR4 | 2012–2019 |
| Dibromochloromethane | 4.6 µg/L No EPA limit set | 51/52 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 8.23 µg/L No EPA limit set | 44/52 | SYR4 | 2012–2019 |
| Copper | 110 µg/L 8.5% of the EPA limit 1300 µg/L | 38/40 | SYR4 | 2014–2017 |
| Dibromoacetic Acid | 1.8 µg/L No EPA limit set | 28/52 | SYR4 | 2012–2019 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L | 19/19 | LCR | 2025 |
| Lead | 46 µg/L 307% of the EPA limit, in the worst sample — 15 µg/L | 15/40 | SYR4 | 2014–2017 |
| Monobromoacetic Acid | 12.7 µg/L No EPA limit set | 14/52 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 5.34 µg/L No EPA limit set | 12/52 | SYR4 | 2012–2019 |
| Bromoform | 0.5500 µg/L No EPA limit set | 1/52 | SYR4 | 2012–2019 |
29 contaminants tested, none detected
Utility contact
Frequently asked questions about Duquoin
Is Duquoin tap water safe to drink?
EPA monitoring detected 15 contaminants in Duquoin'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 Duquoin's water?
EPA monitoring detected Bromodichloromethane, Chloroform, Dichloroacetic Acid, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does Duquoin serve?
Duquoin reports serving 7,169 people in Illinois, per its EPA record.
Has Duquoin had any water quality violations?
The EPA has 48 violations on file for Duquoin, of which 17 are health-based (a contaminant limit or required treatment was breached) and 5 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.