What was found in Butte'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 |
|---|---|---|---|
| Copper | 686.5 µg/L 53% of the EPA limit 1300 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2018 | 1/1 | SYR4 |
| Fluoride | 124.15 µg/L 3.1% of the EPA limit 4000 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2017 | 1/1 | SYR4 |
| Nitrate-Nitrite | 100 µg/L 1% of the EPA limit 10000 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 55 µg/L 92% of the EPA limit 60 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| TTHM | 43.6 µg/L 55% of the EPA limit 80 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Chloroform | 40 µg/L No EPA limit set Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 32 µg/L No EPA limit set Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 22 µg/L No EPA limit set Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Lead | 7.978 µg/L 53% of the EPA limit 15 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2018 | 1/1 | SYR4 |
| Bromodichloromethane | 3.895 µg/L No EPA limit set Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 2.2 µg/L No EPA limit set Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Selenium | 2 µg/L 4% of the EPA limit 50 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2012 | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.4 pCi/L 9.3% of the EPA limit 15 pCi/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2017 | 1/1 | SYR4 |
| Tetrachloroethylene | 0.7500 µg/L 15% of the EPA limit 5 µg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 0.4660 µg/L No EPA limit set Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: BUTTE SILVERBOW WATER DEPT · 33,000 people · 2024 | 1/1 | LCR |
Water suppliers serving Butte
| Supplier | Population served |
|---|---|
| BUTTE SILVERBOW WATER DEPT | 33,000 |
Frequently asked questions about Butte tap water
Is Butte tap water safe to drink?
EPA testing detected 17 contaminants in the water serving Butte. 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 Butte?
1 public water supplier report drinking-water monitoring for Butte, Montana to the EPA. Each is listed above with its population served.
What contaminants are in Butte's water?
The contaminants EPA monitoring detected in Butte include Copper, Fluoride, Nitrate-Nitrite, Total Haloacetic Acids (HAA5), TTHM. 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.