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 | Archived | 1993-07-01 → 1993-07-31 |
| TT | Health-based | Archived | 1993-07-01 → 1993-07-31 |
| TT | Health-based | Archived | 1993-07-01 → 1993-07-31 |
| TT | Health-based | Archived | 1993-07-01 → 1993-07-31 |
| MR | Monitoring | Resolved | 2025-04-01 → 2025-06-30 |
| MR | Monitoring | Resolved | 2025-04-01 → 2025-06-30 |
| MR | Monitoring | Resolved | 2025-04-01 → 2025-06-30 |
| MR | Monitoring | Resolved | 2025-04-01 → 2025-06-30 |
| MR | Monitoring | Resolved | 2025-04-01 → 2025-06-30 |
| MR | Monitoring | Resolved | 2025-04-01 → 2025-06-30 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 159 µg/L 199% of the EPA limit, in the worst sample — 80 µg/L | 125/125 | SYR4 | 2012–2019 |
| Chloroform | 159 µg/L No EPA limit set | 124/125 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 19.4 µg/L No EPA limit set | 117/125 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 33.2 µg/L 55% of the EPA limit 60 µg/L | 117/125 | SYR4 | 2012–2019 |
| Bromodichloromethane | 22.3 µg/L No EPA limit set | 115/125 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 25.7 µg/L No EPA limit set | 110/125 | SYR4 | 2012–2019 |
| Dibromochloromethane | 4.9 µg/L No EPA limit set | 42/125 | SYR4 | 2012–2019 |
| Copper | 4100 µg/L 315% of the EPA limit, in the worst sample — 1300 µg/L | 35/80 | SYR4 | 2013–2019 |
| Lead | 0.0044 mg/L 29% of the EPA limit 0.0150 mg/L | 24/24 | LCR | 2025 |
| Monochloroacetic Acid | 3.3 µg/L No EPA limit set | 12/125 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.4 µg/L No EPA limit set | 10/125 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.5 µg/L No EPA limit set | 6/125 | SYR4 | 2012–2019 |
| Lithium | 19.5 µg/L No EPA limit set | 2/4 | UCMR-5 | 2025 |
| Lead | 6.04 µg/L 40% of the EPA limit 15 µg/L | 1/80 | SYR4 | 2013–2019 |
28 contaminants tested, none detected
Utility contact
Frequently asked questions about Waterloo
Is Waterloo tap water safe to drink?
EPA monitoring detected 16 contaminants in Waterloo'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 Waterloo's water?
EPA monitoring detected TTHM, Chloroform, Dichloroacetic Acid, Total Haloacetic Acids (HAA5), Bromodichloromethane, and others. The full list with the level and data source for each is above.
How many people does Waterloo serve?
Waterloo reports serving 10,190 people in Illinois, per its EPA record.
Has Waterloo had any water quality violations?
The EPA has 111 violations on file for Waterloo, of which 4 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.