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Tap water quality report

Choteau, MT

EPA monitoring detected 22 contaminants across the 3 water suppliers serving Choteau. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
1,935
people served
22
contaminants found
Montana rankings Lead in Montana PFAS in Montana

What was found in Choteau's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
9090 µg/L 91%
of the EPA limit 10000 µg/L
 3/3 SYR4
Copper
985 µg/L 76%
of the EPA limit 1300 µg/L
 3/3 SYR4
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
 2/3 SYR4
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
 1/3 SYR4
Lead
44 µg/L 293%
of the EPA limit, in the worst sample — 15 µg/L
 3/3 SYR4
TTHM
19 µg/L 24%
of the EPA limit 80 µg/L
 3/3 SYR4
Chloroform
14 µg/L
No EPA limit set
 3/3 SYR4
Total Haloacetic Acids (HAA5)
11 µg/L 18%
of the EPA limit 60 µg/L
 3/3 SYR4
Bromoform
10 µg/L
No EPA limit set
 2/3 SYR4
Picloram
8.8 µg/L 1.8%
of the EPA limit 500 µg/L
 1/3 SYR4
Dichloroacetic Acid
7.1 µg/L
No EPA limit set
 2/3 SYR4
Dibromochloromethane
5.9 µg/L
No EPA limit set
 3/3 SYR4
Bromodichloromethane
5.1 µg/L
No EPA limit set
 3/3 SYR4
Gross Alpha, Excl. Radon And U
5 pCi/L 33%
of the EPA limit 15 pCi/L
 2/3 SYR4
Trichloroacetic Acid
4.4 µg/L
No EPA limit set
 2/3 SYR4
Combined Uranium
4 µg/L 13%
of the EPA limit 30 µg/L
 2/3 SYR4
Dibromoacetic Acid
3.8 µg/L
No EPA limit set
 3/3 SYR4
Arsenic
3 µg/L 30%
of the EPA limit 10 µg/L
 2/3 SYR4
Dichloromethane
1.9 µg/L 38%
of the EPA limit 5 µg/L
 1/3 SYR4
Combined Radium (-226 And -228)
1.7 pCi/L 34%
of the EPA limit 5 pCi/L
 1/3 SYR4
Monochloroacetic Acid
1.3 µg/L
No EPA limit set
 1/3 SYR4
Lead
0.0040 mg/L 27%
of the EPA limit 0.0150 mg/L
 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 single worst sample on record — 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

SupplierPopulation 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, 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.