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Tap water quality report

Lyman, WY

EPA monitoring detected 24 contaminants across the 2 water suppliers serving Lyman. 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
3,931
people served
24
contaminants found
Wyoming rankings Lead in Wyoming PFAS in Wyoming

What was found in Lyman'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
959 µg/L 74%
of the EPA limit 1300 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2017
2/2 SYR4
Fluoride
840 µg/L 21%
of the EPA limit 4000 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2017
2/2 SYR4
Nitrate
300 µg/L 3%
of the EPA limit 10000 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2012
1/2 SYR4
Nitrate-Nitrite
300 µg/L 3%
of the EPA limit 10000 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
2/2 SYR4
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2017
Highest in the city: 200 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
TTHM
80.5 µg/L 101%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 84.45 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Chloroform
63.1 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 73.2 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
64.2 µg/L 107%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 71.63 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Trichloroacetic Acid
27 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 36.8 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Dichloroacetic Acid
31.7 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 34.8 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Bromodichloromethane
20 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 23 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Lead
11.6 µg/L 77%
of the EPA limit 15 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2017
Highest in the city: 21 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2017
2/2 SYR4
Combined Uranium
8.68645 µg/L 29%
of the EPA limit 30 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2016
1/2 SYR4
Arsenic
7.8 µg/L 78%
of the EPA limit 10 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
2/2 SYR4
Dibromochloromethane
6.055 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 7.21 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Monochloroacetic Acid
4.36 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 4.565 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Combined Radium (-226 And -228)
1.745 pCi/L 35%
of the EPA limit 5 pCi/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2016
Highest in the city: 3.155 pCi/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Gross Alpha, Excl. Radon And U
2.7 pCi/L 18%
of the EPA limit 15 pCi/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2016
2/2 SYR4
Dibromoacetic Acid
1.5 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 1.56 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Thallium, Total
1.1 µg/L 55%
of the EPA limit 2 µg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2017
Highest in the city: 1.46 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
Highest in the city: BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
1/2 SYR4
Monobromoacetic Acid
0.7600 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 0.8840 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Bromoform
0.7345 µg/L
No EPA limit set
Main supplier: LYMAN, TOWN OF · 2,203 people · 2019
Highest in the city: 0.8670 µg/L — BRIDGER VALLEY JOINT POWERS BOARD · 1,728 people · 2019
2/2 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: LYMAN, TOWN OF · 2,203 people · 2023
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 Lyman

SupplierPopulation served
LYMAN, TOWN OF 2,203
BRIDGER VALLEY JOINT POWERS BOARD 1,728

Frequently asked questions about Lyman tap water

Is Lyman tap water safe to drink?

EPA testing detected 24 contaminants in the water serving Lyman. 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 Lyman?

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

What contaminants are in Lyman's water?

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