What was found in Gillette's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 5000 µg/L 125% of the EPA limit, in the worst sample — 4000 µg/L | 33/43 | SYR4 |
| Nitrate-Nitrite | 3100 µg/L 31% of the EPA limit 10000 µg/L | 32/43 | SYR4 |
| Copper | 756 µg/L 58% of the EPA limit 1300 µg/L | 40/43 | SYR4 |
| Barium | 710 µg/L 36% of the EPA limit 2000 µg/L | 33/43 | SYR4 |
| Lead | 144 µg/L 960% of the EPA limit, in the worst sample — 15 µg/L | 40/43 | SYR4 |
| Cyanide | 130 µg/L 65% of the EPA limit 200 µg/L | 2/43 | SYR4 |
| TTHM | 31 µg/L 39% of the EPA limit 80 µg/L | 39/43 | SYR4 |
| Gross Alpha, Excl. Radon And U | 17.7 pCi/L 118% of the EPA limit, in the worst sample — 15 pCi/L | 28/43 | SYR4 |
| Bromoform | 16 µg/L No EPA limit set | 37/43 | SYR4 |
| Dibromochloromethane | 12 µg/L No EPA limit set | 38/43 | SYR4 |
| Nitrate | 10 µg/L 0.1% of the EPA limit 10000 µg/L | 1/43 | SYR4 |
| Combined Radium (-226 And -228) | 9.7 pCi/L 194% of the EPA limit, in the worst sample — 5 pCi/L | 29/43 | SYR4 |
| Combined Uranium | 9.3 µg/L 31% of the EPA limit 30 µg/L | 2/43 | SYR4 |
| Selenium | 9 µg/L 18% of the EPA limit 50 µg/L | 9/43 | SYR4 |
| Chromium | 8 µg/L 8% of the EPA limit 100 µg/L | 4/43 | SYR4 |
| Bromodichloromethane | 7.9 µg/L No EPA limit set | 38/43 | SYR4 |
| Total Haloacetic Acids (HAA5) | 6.5 µg/L 11% of the EPA limit 60 µg/L | 37/43 | SYR4 |
| Chloroform | 4.8 µg/L No EPA limit set | 36/43 | SYR4 |
| Arsenic | 3 µg/L 30% of the EPA limit 10 µg/L | 3/43 | SYR4 |
| Dichloroacetic Acid | 3 µg/L No EPA limit set | 21/43 | SYR4 |
| Dibromoacetic Acid | 2.9 µg/L No EPA limit set | 36/43 | SYR4 |
| Trichloroacetic Acid | 1.9 µg/L No EPA limit set | 11/43 | SYR4 |
| Xylenes, Total | 1.3 µg/L 0% of the EPA limit 10000 µg/L | 4/43 | SYR4 |
| Monochloroacetic Acid | 1.2 µg/L No EPA limit set | 2/43 | SYR4 |
| Diquat | 0.8400 µg/L 4.2% of the EPA limit 20 µg/L | 2/43 | SYR4 |
| Monobromoacetic Acid | 0.5700 µg/L No EPA limit set | 2/43 | SYR4 |
| Asbestos | 0.2000 MFL 2.9% of the EPA limit 7 MFL | 1/43 | SYR4 |
| Lead | 0.0080 mg/L 53% of the EPA limit 0.0150 mg/L | 43/43 | LCR |
Water suppliers serving Gillette
Frequently asked questions about Gillette tap water
Is Gillette tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Gillette. 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 Gillette?
43 public water suppliers report drinking-water monitoring for Gillette, Wyoming to the EPA. Each is listed above with its population served.
What contaminants are in Gillette's water?
The contaminants EPA monitoring detected in Gillette include Fluoride, Nitrate-Nitrite, Copper, Barium, Lead. The full list, with the highest level found 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.