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Tap water quality report

Chester, MT

EPA monitoring detected 19 contaminants across the 7 water suppliers serving Chester. 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.

7
water suppliers
1,615
people served
19
contaminants found
Montana rankings Lead in Montana PFAS in Montana

What was found in Chester'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
Copper
1016.35 µg/L 78%
of the EPA limit 1300 µg/L
Main supplier: CHESTER TOWN OF · 870 people · 2019
5/7 SYR4
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
Main supplier: CHESTER TOWN OF · 870 people · 2013
Highest in the city: 1000 µg/L — EAGLE CREEK COLONY · 125 people · 2012
4/7 SYR4
Nitrate-Nitrite
150 µg/L 1.5%
of the EPA limit 10000 µg/L
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 730 µg/L — SAGE CREEK COLONY · 130 people · 2019
4/7 SYR4
TTHM
61 µg/L 76%
of the EPA limit 80 µg/L
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 100.8 µg/L — RIVERVIEW COLONY · 130 people · 2019
4/7 SYR4
Total Haloacetic Acids (HAA5)
52.2 µg/L 87%
of the EPA limit 60 µg/L
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 91 µg/L — RIVERVIEW COLONY · 130 people · 2019
4/7 SYR4
Chloroform
47.1 µg/L
No EPA limit set
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 89 µg/L — RIVERVIEW COLONY · 130 people · 2019
4/7 SYR4
Barium
70 µg/L 3.5%
of the EPA limit 2000 µg/L
Highest in the city: SAGE CREEK CO WATER DISTRICT · 225 people · 2012
1/7 SYR4
Trichloroacetic Acid
27 µg/L
No EPA limit set
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 44.5 µg/L — SOUTH CHESTER WATER DIST · 55 people · 2019
4/7 SYR4
Dichloroacetic Acid
24.35 µg/L
No EPA limit set
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 40.2 µg/L — RIVERVIEW COLONY · 130 people · 2019
4/7 SYR4
Bromodichloromethane
12 µg/L
No EPA limit set
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 13 µg/L — RIVERVIEW COLONY · 130 people · 2019
4/7 SYR4
Monochloroacetic Acid
2.7 µg/L
No EPA limit set
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 10.46 µg/L — SOUTH CHESTER WATER DIST · 55 people · 2019
3/7 SYR4
Dichloromethane
9.4 µg/L 188%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
Main supplier: CHESTER TOWN OF · 870 people · 2019
1/7 SYR4
Lead
3 µg/L 20%
of the EPA limit 15 µg/L
Main supplier: CHESTER TOWN OF · 870 people · 2019
Highest in the city: 7.55 µg/L — SAGE CREEK CO WATER DISTRICT · 225 people · 2018
3/7 SYR4
Dibromochloromethane
2.865 µg/L
No EPA limit set
Main supplier: CHESTER TOWN OF · 870 people · 2019
3/7 SYR4
Xylenes, Total
1.8 µg/L 0%
of the EPA limit 10000 µg/L
Main supplier: CHESTER TOWN OF · 870 people · 2019
1/7 SYR4
Monobromoacetic Acid
1.307 µg/L
No EPA limit set
Highest in the city: RIVERVIEW COLONY · 130 people · 2019
1/7 SYR4
Combined Uranium
1 µg/L 3.3%
of the EPA limit 30 µg/L
Highest in the city: SAGE CREEK CO WATER DISTRICT · 225 people · 2014
1/7 SYR4
Dibromoacetic Acid
0.5930 µg/L
No EPA limit set
Main supplier: CHESTER TOWN OF · 870 people · 2019
3/7 SYR4
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
Main supplier: CHESTER TOWN OF · 870 people · 2025
7/7 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 Chester

SupplierPopulation served
CHESTER TOWN OF 870
SAGE CREEK CO WATER DISTRICT 225
SAGE CREEK COLONY 130
RIVERVIEW COLONY 130
EAGLE CREEK COLONY 125
SUNNY BROOK COLONY 80
SOUTH CHESTER WATER DIST 55

Frequently asked questions about Chester tap water

Is Chester tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Chester. 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 Chester?

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

What contaminants are in Chester's water?

The contaminants EPA monitoring detected in Chester include Copper, Fluoride, Nitrate-Nitrite, TTHM, Total Haloacetic Acids (HAA5). 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.