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Tap water quality report

Dubois, WY

EPA monitoring detected 19 contaminants across the 2 water suppliers serving Dubois. 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
1,890
people served
19
contaminants found
Wyoming rankings Lead in Wyoming PFAS in Wyoming

What was found in Dubois'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
4825 µg/L 48%
of the EPA limit 10000 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2019
1/2 SYR4
Copper
845.55 µg/L 65%
of the EPA limit 1300 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2017
Highest in the city: 2961 µg/L — WARM SPRINGS WATER DISTRICT · 68 people · 2018
2/2 SYR4
Nitrate-Nitrite
1980 µg/L 20%
of the EPA limit 10000 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2017
1/2 SYR4
Fluoride
488.5 µg/L 12%
of the EPA limit 4000 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2015
Highest in the city: 1075 µg/L — WARM SPRINGS WATER DISTRICT · 68 people · 2019
2/2 SYR4
Chloroform
111 µg/L
No EPA limit set
Highest in the city: WARM SPRINGS WATER DISTRICT · 68 people · 2017
1/2 SYR4
TTHM
29.66 µg/L 37%
of the EPA limit 80 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2019
Highest in the city: 109.24 µg/L — WARM SPRINGS WATER DISTRICT · 68 people · 2017
2/2 SYR4
Barium
87.15 µg/L 4.4%
of the EPA limit 2000 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2015
Highest in the city: 100 µg/L — WARM SPRINGS WATER DISTRICT · 68 people · 2019
2/2 SYR4
Lead
26.035 µg/L 174%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2017
2/2 SYR4
Arsenic
1.29 µg/L 13%
of the EPA limit 10 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2015
Highest in the city: 23 µg/L — WARM SPRINGS WATER DISTRICT · 68 people · 2019
2/2 SYR4
Bromodichloromethane
9.52 µg/L
No EPA limit set
Highest in the city: WARM SPRINGS WATER DISTRICT · 68 people · 2017
1/2 SYR4
Total Haloacetic Acids (HAA5)
9.5 µg/L 16%
of the EPA limit 60 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2019
2/2 SYR4
Combined Radium (-226 And -228)
1.4261 pCi/L 29%
of the EPA limit 5 pCi/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2016
Highest in the city: 4.21 pCi/L — WARM SPRINGS WATER DISTRICT · 68 people · 2019
2/2 SYR4
Dichloromethane
3.4 µg/L 68%
of the EPA limit 5 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2015
1/2 SYR4
Combined Uranium
3.184 µg/L 11%
of the EPA limit 30 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2016
1/2 SYR4
Gross Alpha, Excl. Radon And U
0.9100 pCi/L 6.1%
of the EPA limit 15 pCi/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2016
Highest in the city: 3.16 pCi/L — WARM SPRINGS WATER DISTRICT · 68 people · 2019
2/2 SYR4
Selenium
3.045 µg/L 6.1%
of the EPA limit 50 µg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2015
1/2 SYR4
Trichloroacetic Acid
2.6 µg/L
No EPA limit set
Highest in the city: WARM SPRINGS WATER DISTRICT · 68 people · 2016
1/2 SYR4
Dibromochloromethane
0.6700 µg/L
No EPA limit set
Highest in the city: WARM SPRINGS WATER DISTRICT · 68 people · 2017
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: DUBOIS, TOWN OF · 1,822 people · 2025
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 Dubois

SupplierPopulation served
DUBOIS, TOWN OF 1,822
WARM SPRINGS WATER DISTRICT 68

Frequently asked questions about Dubois tap water

Is Dubois tap water safe to drink?

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

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

What contaminants are in Dubois's water?

The contaminants EPA monitoring detected in Dubois include Nitrate, Copper, Nitrate-Nitrite, Fluoride, Chloroform. 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.