What was found in Troy'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-Nitrite | 2402.5 µg/L 24% of the EPA limit 10000 µg/L Main supplier: TROY CITY OF · 2,100 people · 2019 | 4/4 | SYR4 |
| Nitrate | 1650 µg/L 17% of the EPA limit 10000 µg/L Main supplier: TROY CITY OF · 2,100 people · 2014 | 2/4 | SYR4 |
| Copper | 182.5 µg/L 14% of the EPA limit 1300 µg/L Main supplier: TROY CITY OF · 2,100 people · 2018
Highest in the city: 283 µg/L — WILDERNESS PLATEAU WATER AND SEWER DIST · 208 people · 2017 | 4/4 | SYR4 |
| Fluoride | 50 µg/L 1.3% of the EPA limit 4000 µg/L Main supplier: TROY CITY OF · 2,100 people · 2014
Highest in the city: 89.5 µg/L — TURNING WINDS · 50 people · 2019 | 2/4 | SYR4 |
| Barium | 50 µg/L 2.5% of the EPA limit 2000 µg/L Highest in the city: TURNING WINDS · 50 people · 2019 | 1/4 | SYR4 |
| Lead | 7.4 µg/L 49% of the EPA limit 15 µg/L Main supplier: TROY CITY OF · 2,100 people · 2018 | 3/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.2 pCi/L 15% of the EPA limit 15 pCi/L Main supplier: TROY CITY OF · 2,100 people · 2017
Highest in the city: 3.9 pCi/L — TURNING WINDS · 50 people · 2013 | 3/4 | SYR4 |
| Arsenic | 3 µg/L 30% of the EPA limit 10 µg/L Highest in the city: ANGEL ISLAND SUBDIVISION · 150 people · 2017 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.3 pCi/L 26% of the EPA limit 5 pCi/L Highest in the city: WILDERNESS PLATEAU WATER AND SEWER DIST · 208 people · 2016 | 1/4 | SYR4 |
| Combined Uranium | 1 µg/L 3.3% of the EPA limit 30 µg/L Highest in the city: TURNING WINDS · 50 people · 2013 | 1/4 | SYR4 |
| TTHM | 0.5700 µg/L 0.7% of the EPA limit 80 µg/L Highest in the city: WILDERNESS PLATEAU WATER AND SEWER DIST · 208 people · 2017 | 1/4 | SYR4 |
| Dibromoacetic Acid | 0.2700 µg/L No EPA limit set Highest in the city: WILDERNESS PLATEAU WATER AND SEWER DIST · 208 people · 2017 | 1/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 0.2700 µg/L 0.5% of the EPA limit 60 µg/L Highest in the city: WILDERNESS PLATEAU WATER AND SEWER DIST · 208 people · 2017 | 1/4 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: TROY CITY OF · 2,100 people · 2024 | 4/4 | LCR |
Water suppliers serving Troy
| Supplier | Population served |
|---|---|
| TROY CITY OF | 2,100 |
| WILDERNESS PLATEAU WATER AND SEWER DIST | 208 |
| ANGEL ISLAND SUBDIVISION | 150 |
| TURNING WINDS | 50 |
Frequently asked questions about Troy tap water
Is Troy tap water safe to drink?
EPA testing detected 14 contaminants in the water serving Troy. 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 Troy?
4 public water suppliers report drinking-water monitoring for Troy, Montana to the EPA. Each is listed above with its population served.
What contaminants are in Troy's water?
The contaminants EPA monitoring detected in Troy include Nitrate-Nitrite, Nitrate, Copper, Fluoride, Barium. 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.