What was found in Choteau'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 | 477 µg/L 4.8% of the EPA limit 10000 µg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2019
Highest in the city: 9030 µg/L — MILLER COLONY · 84 people · 2019 | 3/3 | SYR4 |
| Copper | 170.6 µg/L 13% of the EPA limit 1300 µg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2017
Highest in the city: 806.7 µg/L — MILLER COLONY · 84 people · 2017 | 3/3 | SYR4 |
| Fluoride | 300 µg/L 7.5% of the EPA limit 4000 µg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2018
Highest in the city: 785 µg/L — MILLER COLONY · 84 people · 2018 | 2/3 | SYR4 |
| Barium | 100 µg/L 5% of the EPA limit 2000 µg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2018 | 1/3 | SYR4 |
| TTHM | 11.94 µg/L 15% of the EPA limit 80 µg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2019
Highest in the city: 19 µg/L — MILLER COLONY · 84 people · 2018 | 3/3 | SYR4 |
| Lead | 16.8 µg/L 112% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2017 | 3/3 | SYR4 |
| Chloroform | 7.885 µg/L No EPA limit set Main supplier: CHOTEAU CITY OF · 1,691 people · 2019
Highest in the city: 13.4 µg/L — MILLER COLONY · 84 people · 2018 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 10.37 µg/L 17% of the EPA limit 60 µg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2019 | 3/3 | SYR4 |
| Bromoform | 8.875 µg/L No EPA limit set Highest in the city: MILLER COLONY · 84 people · 2018 | 2/3 | SYR4 |
| Picloram | 8.1 µg/L 1.6% of the EPA limit 500 µg/L Highest in the city: MILLER COLONY · 84 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 6.45 µg/L No EPA limit set Main supplier: CHOTEAU CITY OF · 1,691 people · 2019 | 2/3 | SYR4 |
| Dibromochloromethane | 0.7080 µg/L No EPA limit set Main supplier: CHOTEAU CITY OF · 1,691 people · 2019
Highest in the city: 5.54 µg/L — MILLER COLONY · 84 people · 2018 | 3/3 | SYR4 |
| Bromodichloromethane | 3.26 µg/L No EPA limit set Main supplier: CHOTEAU CITY OF · 1,691 people · 2019
Highest in the city: 4.74 µg/L — MILLER COLONY · 84 people · 2018 | 3/3 | SYR4 |
| Trichloroacetic Acid | 4.37 µg/L No EPA limit set Main supplier: CHOTEAU CITY OF · 1,691 people · 2019 | 2/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.155 pCi/L 28% of the EPA limit 15 pCi/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2018
Highest in the city: 4.36 pCi/L — MILLER COLONY · 84 people · 2018 | 2/3 | SYR4 |
| Combined Uranium | 4 µg/L 13% of the EPA limit 30 µg/L Highest in the city: MILLER COLONY · 84 people · 2018 | 2/3 | SYR4 |
| Dibromoacetic Acid | 0.2700 µg/L No EPA limit set Main supplier: CHOTEAU CITY OF · 1,691 people · 2019
Highest in the city: 3.395 µg/L — MILLER COLONY · 84 people · 2017 | 3/3 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2018
Highest in the city: 3 µg/L — MILLER COLONY · 84 people · 2018 | 2/3 | SYR4 |
| Dichloromethane | 1.89 µg/L 38% of the EPA limit 5 µg/L Highest in the city: MILLER COLONY · 84 people · 2018 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.62 pCi/L 32% of the EPA limit 5 pCi/L Highest in the city: MILLER COLONY · 84 people · 2018 | 1/3 | SYR4 |
| Monochloroacetic Acid | 1.3 µg/L No EPA limit set Highest in the city: NEW ROCKPORT COLONY INC · 160 people · 2017 | 1/3 | SYR4 |
| Lead | 0.0040 mg/L 27% of the EPA limit 0.0150 mg/L Main supplier: CHOTEAU CITY OF · 1,691 people · 2026 | 3/3 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Choteau
| Supplier | Population served |
|---|---|
| CHOTEAU CITY OF | 1,691 |
| NEW ROCKPORT COLONY INC | 160 |
| MILLER COLONY | 84 |
Frequently asked questions about Choteau tap water
Is Choteau tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Choteau. 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 Choteau?
3 public water suppliers report drinking-water monitoring for Choteau, Montana to the EPA. Each is listed above with its population served.
What contaminants are in Choteau's water?
The contaminants EPA monitoring detected in Choteau include Nitrate-Nitrite, Copper, Fluoride, Barium, 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.