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 | Resolved | 2005-07-01 → 2005-07-31 |
| MCL | Health-based | Resolved | 2005-07-01 → 2005-07-31 |
| MCL | Health-based | Resolved | 2005-07-01 → 2005-07-31 |
| MCL | Health-based | Resolved | 2005-07-01 → 2005-07-31 |
| MCL | Health-based | Resolved | 2005-06-01 → 2005-06-30 |
| MCL | Health-based | Resolved | 2005-06-01 → 2005-06-30 |
| MCL | Health-based | Resolved | 2005-06-01 → 2005-06-30 |
| MCL | Health-based | Resolved | 2005-06-01 → 2005-06-30 |
| MCL | Health-based | Resolved | 2004-07-01 → 2004-07-31 |
| MCL | Health-based | Resolved | 2004-07-01 → 2004-07-31 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Chloroform | 4.456 µg/L No EPA limit set
worst single sample: 9.6 µg/L | 93/120 | SYR4 | 2012–2019 |
| Copper | 70.555 µg/L 5.4% of the EPA limit 1300 µg/L
worst single sample: 117 µg/L | 88/98 | SYR4 | 2012–2018 |
| Dichloroacetic Acid | 6.1665 µg/L No EPA limit set
worst single sample: 6.98 µg/L | 78/120 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 4.6275 µg/L No EPA limit set
worst single sample: 8.19 µg/L | 54/120 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 9.304 µg/L 16% of the EPA limit 60 µg/L
worst single sample: 11.9 µg/L | 45/120 | SYR4 | 2012–2019 |
| TTHM | 10.63 µg/L 13% of the EPA limit 80 µg/L
worst single sample: 11.4 µg/L | 28/120 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 1.886 µg/L No EPA limit set
worst single sample: 2.04 µg/L | 23/120 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.6215 µg/L No EPA limit set
worst single sample: 1.63 µg/L | 18/120 | SYR4 | 2012–2019 |
| Lead | 0.0012 mg/L 8% of the EPA limit 0.0150 mg/L | 13/13 | LCR | 2024 |
| Lead | 22.645 µg/L 151% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 30.7 µg/L | 10/98 | SYR4 | 2012–2018 |
| Bromodichloromethane | 1.686 µg/L No EPA limit set
worst single sample: 1.75 µg/L | 9/120 | SYR4 | 2012–2019 |
| Lithium | 29 µg/L No EPA limit set | 2/2 | UCMR-5 | 2025 |
| Bromoform | 2.67 µg/L No EPA limit set | 1/120 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.78 µg/L No EPA limit set | 1/120 | SYR4 | 2012–2019 |
30 contaminants tested, none detected
Utility contact
Frequently asked questions about Isu
Is Isu tap water safe to drink?
EPA monitoring detected 14 contaminants in Isu'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 Isu's water?
EPA monitoring detected Chloroform, Copper, Dichloroacetic Acid, Monochloroacetic Acid, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does Isu serve?
Isu reports serving 42,000 people in Iowa, per its EPA record.
Has Isu had any water quality violations?
The EPA has 43 violations on file for Isu, of which 16 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.