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Tap water quality report

Three Forks, MT

EPA monitoring detected 25 contaminants across the 1 water supplier serving Three Forks. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
1,900
people served
25
contaminants found
Montana rankings Lead in Montana PFAS in Montana

What was found in Three Forks'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.

ContaminantLevel vs EPA limitSuppliersSource
Fluoride
2400 µg/L 60%
of the EPA limit 4000 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2018
1/1 SYR4
Nitrate-Nitrite
701 µg/L 7%
of the EPA limit 10000 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Copper
161 µg/L 12%
of the EPA limit 1300 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Barium
70 µg/L 3.5%
of the EPA limit 2000 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2018
1/1 SYR4
TTHM
24.4 µg/L 31%
of the EPA limit 80 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Gross Alpha, Excl. Radon And U
19.95 pCi/L 133%
of the EPA limit, at the 95th percentile of samples — 15 pCi/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2018
1/1 SYR4
Arsenic
15.3 µg/L 153%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Lead
11.8 µg/L 79%
of the EPA limit 15 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Dibromochloromethane
9.125 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Chloroform
8.8 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Bromoform
7.18 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Combined Uranium
7 µg/L 23%
of the EPA limit 30 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
6.395 µg/L 11%
of the EPA limit 60 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Bromodichloromethane
5.84 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Dalapon
5.3 µg/L 2.7%
of the EPA limit 200 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2018
1/1 SYR4
Dibromoacetic Acid
3.945 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Antimony, Total
2 µg/L 33%
of the EPA limit 6 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2018
1/1 SYR4
Selenium
1.95 µg/L 3.9%
of the EPA limit 50 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2018
1/1 SYR4
Combined Radium (-226 And -228)
1.865 pCi/L 37%
of the EPA limit 5 pCi/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2018
1/1 SYR4
Dichloroacetic Acid
1.58 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Toluene
1.2 µg/L 0.1%
of the EPA limit 1000 µg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2018
1/1 SYR4
Monochloroacetic Acid
1.1 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Monobromoacetic Acid
0.8000 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Trichloroacetic Acid
0.7100 µg/L
No EPA limit set
Main supplier: THREE FORKS CITY OF · 1,900 people · 2019
1/1 SYR4
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: THREE FORKS CITY OF · 1,900 people · 2025
1/1 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 Three Forks

SupplierPopulation served
THREE FORKS CITY OF 1,900

Frequently asked questions about Three Forks tap water

Is Three Forks tap water safe to drink?

EPA testing detected 25 contaminants in the water serving Three Forks. 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 Three Forks?

1 public water supplier report drinking-water monitoring for Three Forks, Montana to the EPA. Each is listed above with its population served.

What contaminants are in Three Forks's water?

The contaminants EPA monitoring detected in Three Forks include Fluoride, Nitrate-Nitrite, Copper, 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.