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Tap water quality report

Fairfield, MT

EPA monitoring detected 22 contaminants across the 2 water suppliers serving Fairfield. 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.

2
water suppliers
1,188
people served
22
contaminants found
Montana rankings Lead in Montana PFAS in Montana

What was found in Fairfield'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
Nitrate-Nitrite
8670 µg/L 87%
of the EPA limit 10000 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
2/2 SYR4
Fluoride
375 µg/L 9.4%
of the EPA limit 4000 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 884.85 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Copper
401.8 µg/L 31%
of the EPA limit 1300 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2017
Highest in the city: 764.9 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2018
2/2 SYR4
Barium
102.75 µg/L 5.1%
of the EPA limit 2000 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
2/2 SYR4
Lithium
24.5 µg/L
No EPA limit set
Main supplier: FAIRFIELD TOWN OF · 718 people · 2025
1/2 UCMR-5
TTHM
7.1 µg/L 8.9%
of the EPA limit 80 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 23.48 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
4.82 µg/L 8%
of the EPA limit 60 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 20.79 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Chloroform
5.15 µg/L
No EPA limit set
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 15.45 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Dichloroacetic Acid
3.38 µg/L
No EPA limit set
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 12.322 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Combined Uranium
3 µg/L 10%
of the EPA limit 30 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 10 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Lead
6.5 µg/L 43%
of the EPA limit 15 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2017
2/2 SYR4
Monochloroacetic Acid
5.9525 µg/L
No EPA limit set
Highest in the city: TRI COUNTY WATER DISTRICT · 470 people · 2019
1/2 SYR4
Bromodichloromethane
2.465 µg/L
No EPA limit set
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 5.18 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Trichloroacetic Acid
1.44 µg/L
No EPA limit set
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 4.991 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Gross Alpha, Excl. Radon And U
4.28 pCi/L 29%
of the EPA limit 15 pCi/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
2/2 SYR4
Combined Radium (-226 And -228)
3.33 pCi/L 67%
of the EPA limit 5 pCi/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
2/2 SYR4
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 2.95 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Dibromochloromethane
1.756 µg/L
No EPA limit set
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
Highest in the city: 2.7375 µg/L — TRI COUNTY WATER DISTRICT · 470 people · 2019
2/2 SYR4
Bromoform
2.6475 µg/L
No EPA limit set
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
2/2 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2019
1/2 SYR4
Dibromoacetic Acid
0.5618 µg/L
No EPA limit set
Highest in the city: TRI COUNTY WATER DISTRICT · 470 people · 2019
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: FAIRFIELD TOWN OF · 718 people · 2017
Highest in the city: 0.0010 mg/L — TRI COUNTY WATER DISTRICT · 470 people · 2024
2/2 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 Fairfield

SupplierPopulation served
FAIRFIELD TOWN OF 718
TRI COUNTY WATER DISTRICT 470

Frequently asked questions about Fairfield tap water

Is Fairfield tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Fairfield. 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 Fairfield?

2 public water suppliers report drinking-water monitoring for Fairfield, Montana to the EPA. Each is listed above with its population served.

What contaminants are in Fairfield's water?

The contaminants EPA monitoring detected in Fairfield include Nitrate-Nitrite, Fluoride, Copper, Barium, Lithium. 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.