What was found in Hamilton'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 |
|---|---|---|---|
| Nitrate-Nitrite | 3340 µg/L 33% of the EPA limit 10000 µg/L | 13/13 | SYR4 |
| Nitrate | 1560 µg/L 16% of the EPA limit 10000 µg/L | 4/13 | SYR4 |
| Copper | 1500 µg/L 115% of the EPA limit, in the worst sample — 1300 µg/L | 13/13 | SYR4 |
| Fluoride | 600 µg/L 15% of the EPA limit 4000 µg/L | 12/13 | SYR4 |
| Lead | 153 µg/L 1020% of the EPA limit, in the worst sample — 15 µg/L | 12/13 | SYR4 |
| Barium | 80 µg/L 4% of the EPA limit 2000 µg/L | 3/13 | SYR4 |
| TTHM | 41 µg/L 51% of the EPA limit 80 µg/L | 3/13 | SYR4 |
| Chloroform | 36 µg/L No EPA limit set | 3/13 | SYR4 |
| Arsenic | 8 µg/L 80% of the EPA limit 10 µg/L | 6/13 | SYR4 |
| Combined Uranium | 8 µg/L 27% of the EPA limit 30 µg/L | 11/13 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.6 µg/L 9.3% of the EPA limit 60 µg/L | 2/13 | SYR4 |
| Dibromochloromethane | 5.4 µg/L No EPA limit set | 3/13 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.9 pCi/L 33% of the EPA limit 15 pCi/L | 8/13 | SYR4 |
| Combined Radium (-226 And -228) | 4.7 pCi/L 94% of the EPA limit 5 pCi/L | 2/13 | SYR4 |
| Dichloroacetic Acid | 3.9 µg/L No EPA limit set | 1/13 | SYR4 |
| Bromodichloromethane | 3.8 µg/L No EPA limit set | 3/13 | SYR4 |
| Bromoform | 2.8 µg/L No EPA limit set | 1/13 | SYR4 |
| Trichloroacetic Acid | 2.6 µg/L No EPA limit set | 1/13 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.4 µg/L 40% of the EPA limit 6 µg/L | 1/13 | SYR4 |
| Dibromoacetic Acid | 2.1 µg/L No EPA limit set | 2/13 | SYR4 |
| Cadmium | 1 µg/L 20% of the EPA limit 5 µg/L | 1/13 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L | 1/13 | SYR4 |
| Lead | 0.0050 mg/L 33% of the EPA limit 0.0150 mg/L | 13/13 | LCR |
| PFBS | 0.0031 µg/L No EPA limit set | 1/13 | UCMR-5 |
Water suppliers serving Hamilton
| Supplier | Population served |
|---|---|
| HAMILTON CITY OF | 5,660 |
| STOCK FARM THE | 150 |
| DALY ESTATES SUBDIVISION | 123 |
| WILD FLOWER HOA, THE | 120 |
| WESTANA MOBILE MANOR HAMILTON | 90 |
| ANTIGONE ACRES HOA | 85 |
| WHITE BIRD COMMUNITY THE | 82 |
| BLUEBIRD MB HM PARK HAMILTON | 75 |
| BIG SKY TRAILER CT HAMILTON | 70 |
| SAWTOOTH VILLA | 70 |
| HAMILTON MOBILE VILLAGE | 53 |
| HONEY LANE COMMUNITY | 50 |
| WARDS COVE WATER USERS | 45 |
Frequently asked questions about Hamilton tap water
Is Hamilton tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Hamilton. 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 Hamilton?
13 public water suppliers report drinking-water monitoring for Hamilton, Montana to the EPA. Each is listed above with its population served.
What contaminants are in Hamilton's water?
The contaminants EPA monitoring detected in Hamilton include Nitrate-Nitrite, Nitrate, Copper, Fluoride, 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.