What was found in Little Diomede's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 25000 µg/L 250% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2017 | 1/1 | SYR4 |
| Nitrate-Nitrite | 19800 µg/L 198% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2019 | 1/1 | SYR4 |
| Copper | 4100 µg/L 315% of the EPA limit, at the 95th percentile of samples — 1300 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2019 | 1/1 | SYR4 |
| Fluoride | 203 µg/L 5.1% of the EPA limit 4000 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2013 | 1/1 | SYR4 |
| Arsenic | 63.485 µg/L 635% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 17.2 µg/L 29% of the EPA limit 60 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2017 | 1/1 | SYR4 |
| TTHM | 16.2 µg/L 20% of the EPA limit 80 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2017 | 1/1 | SYR4 |
| Trichloroacetic Acid | 15 µg/L No EPA limit set Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2017 | 1/1 | SYR4 |
| Lead | 12.4 µg/L 83% of the EPA limit 15 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2019 | 1/1 | SYR4 |
| Barium | 11.6 µg/L 0.6% of the EPA limit 2000 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2013 | 1/1 | SYR4 |
| Chloroform | 10.2 µg/L No EPA limit set Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2017 | 1/1 | SYR4 |
| Bromodichloromethane | 3.65 µg/L No EPA limit set Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2017 | 1/1 | SYR4 |
| Dibromochloromethane | 2.3 µg/L No EPA limit set Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2017 | 1/1 | SYR4 |
| Dichloroacetic Acid | 2.21 µg/L No EPA limit set Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2017 | 1/1 | SYR4 |
| Cadmium | 0.6950 µg/L 14% of the EPA limit 5 µg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2013 | 1/1 | SYR4 |
| Lead | 0.0060 mg/L 40% of the EPA limit 0.0150 mg/L Main supplier: DIOMEDE JOINT UTILITIES · 83 people · 2025 | 1/1 | LCR |
Water suppliers serving Little Diomede
| Supplier | Population served |
|---|---|
| DIOMEDE JOINT UTILITIES | 83 |
Frequently asked questions about Little Diomede tap water
Is Little Diomede tap water safe to drink?
EPA testing detected 16 contaminants in the water serving Little Diomede. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Little Diomede?
1 public water supplier report drinking-water monitoring for Little Diomede, Alaska to the EPA. Each is listed above with its population served.
What contaminants are in Little Diomede's water?
The contaminants EPA monitoring detected in Little Diomede include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Arsenic. The full list, with the level at the main supplier and the data source, is in the table above.
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.