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 | 2025-04-01 → 2025-06-30 |
| MCL | Health-based | Archived | 2025-01-01 → 2025-03-31 |
| MCL | Health-based | Archived | 2025-01-01 → 2025-12-31 |
| MCL | Health-based | Archived | 2024-10-01 → 2024-12-31 |
| MCL | Health-based | Archived | 2024-07-01 → 2024-09-30 |
| MCL | Health-based | Archived | 2024-01-01 → 2024-12-31 |
| TT | Health-based | Resolved | 2023-07-01 → 2023-07-31 |
| MCL | Health-based | Archived | 2022-04-01 → 2022-06-30 |
| MCL | Health-based | Archived | 2022-01-01 → 2022-03-31 |
| MCL | Health-based | Archived | 2021-10-01 → 2021-12-31 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Copper | 4100 µg/L 315% of the EPA limit, at the 95th percentile of samples — 1300 µg/L | 41/41 | SYR4 | 2013–2019 |
| Lead | 12.4 µg/L 83% of the EPA limit 15 µg/L
worst single sample: 35 µg/L | 39/41 | SYR4 | 2013–2019 |
| Arsenic | 63.485 µg/L 635% of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 84.1 µg/L | 20/20 | SYR4 | 2012–2019 |
| Lead | 0.0060 mg/L 40% of the EPA limit 0.0150 mg/L | 18/18 | LCR | 2025 |
| Nitrate-Nitrite | 19800 µg/L 198% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 21000 µg/L | 6/6 | SYR4 | 2012–2019 |
| Nitrate | 25000 µg/L 250% of the EPA limit, at the 95th percentile of samples — 10000 µg/L | 2/2 | SYR4 | 2017 |
| Barium | 11.6 µg/L 0.6% of the EPA limit 2000 µg/L | 1/1 | SYR4 | 2013 |
| Bromodichloromethane | 3.65 µg/L No EPA limit set | 1/3 | SYR4 | 2013–2017 |
| Cadmium | 0.6950 µg/L 14% of the EPA limit 5 µg/L | 1/1 | SYR4 | 2013 |
| Chloroform | 10.2 µg/L No EPA limit set | 1/3 | SYR4 | 2013–2017 |
| Dibromochloromethane | 2.3 µg/L No EPA limit set | 1/3 | SYR4 | 2013–2017 |
| Dichloroacetic Acid | 2.21 µg/L No EPA limit set | 1/3 | SYR4 | 2013–2017 |
| Fluoride | 203 µg/L 5.1% of the EPA limit 4000 µg/L | 1/1 | SYR4 | 2013 |
| TTHM | 16.2 µg/L 20% of the EPA limit 80 µg/L | 1/3 | SYR4 | 2013–2017 |
| Total Haloacetic Acids (HAA5) | 17.2 µg/L 29% of the EPA limit 60 µg/L | 1/3 | SYR4 | 2013–2017 |
| Trichloroacetic Acid | 15 µg/L No EPA limit set | 1/3 | SYR4 | 2013–2017 |
32 contaminants tested, none detected
Utility contact
Frequently asked questions about Diomede Joint Utilities
Is Diomede Joint Utilities tap water safe to drink?
EPA monitoring detected 16 contaminants in Diomede Joint Utilities'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 Diomede Joint Utilities's water?
EPA monitoring detected Copper, Lead, Arsenic, Lead, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.
How many people does Diomede Joint Utilities serve?
Diomede Joint Utilities reports serving 83 people in Alaska, per its EPA record.
Has Diomede Joint Utilities had any water quality violations?
The EPA has 3009 violations on file for Diomede Joint Utilities, of which 260 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.