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Tap water quality report

Rock Springs, WY

EPA monitoring detected 14 contaminants across the 12 water suppliers serving Rock Springs. 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.

12
water suppliers
30,723
people served
14
contaminants found
Wyoming rankings Lead in Wyoming PFAS in Wyoming

What was found in Rock Springs'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
740 µg/L 57%
of the EPA limit 1300 µg/L
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
Highest in the city: 953 µg/L — WHITE MOUNTAIN W&S DISTRICT · 3,000 people · 2019
11/12 SYR4
TTHM
52.95 µg/L 66%
of the EPA limit 80 µg/L
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
Highest in the city: 66.25 µg/L — W BAR K MOBILE HOME PARK · 110 people · 2019
11/12 SYR4
Chloroform
43.25 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
Highest in the city: 56 µg/L — LEWIS MOBILE HOME PARK · 370 people · 2019
10/12 SYR4
Total Haloacetic Acids (HAA5)
31.95 µg/L 53%
of the EPA limit 60 µg/L
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
Highest in the city: 45.5 µg/L — W BAR K MOBILE HOME PARK · 110 people · 2019
11/12 SYR4
Trichloroacetic Acid
20.45 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
Highest in the city: 22 µg/L — WESTERN HILLS MHP · 450 people · 2019
10/12 SYR4
Dichloroacetic Acid
16.9 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
Highest in the city: 21.4 µg/L — WESTERN HILLS MHP · 450 people · 2019
10/12 SYR4
Bromodichloromethane
10.34 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
10/12 SYR4
Lead
10.25 µg/L 68%
of the EPA limit 15 µg/L
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
11/12 SYR4
Dibromochloromethane
4.2 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
10/12 SYR4
Monochloroacetic Acid
1.9 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
Highest in the city: 2.35 µg/L — W BAR K MOBILE HOME PARK · 110 people · 2019
10/12 SYR4
Dibromoacetic Acid
1.05 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
Highest in the city: 1.075 µg/L — WHITE MOUNTAIN W&S DISTRICT · 3,000 people · 2019
10/12 SYR4
Monobromoacetic Acid
0.8340 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
4/12 SYR4
Bromoform
0.7500 µg/L
No EPA limit set
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2019
1/12 SYR4
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
Main supplier: ROCK SPRINGS, CITY OF · 24,000 people · 2025
Highest in the city: 0.0140 mg/L — TEN MILE WATER AND SEWER DISTRICT · 305 people · 2025
12/12 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 Rock Springs

SupplierPopulation served
ROCK SPRINGS, CITY OF 24,000
WHITE MOUNTAIN W&S DISTRICT 3,000
CLEARVIEW I&S DISTRICT 930
SKYLINE VILLAGE MOBILE HOME PK 700
WESTERN HILLS MHP 450
LEWIS MOBILE HOME PARK 370
HORIZON MHP 330
TEN MILE WATER AND SEWER DISTRICT 305
WHITE MOUNTAIN MOBILE HOME PARK 270
GARCIA MOBILE HOME PARK 148
W BAR K MOBILE HOME PARK 110
MOBILE CORRALS MHP 110

Frequently asked questions about Rock Springs tap water

Is Rock Springs tap water safe to drink?

EPA testing detected 14 contaminants in the water serving Rock Springs. 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 Rock Springs?

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

What contaminants are in Rock Springs's water?

The contaminants EPA monitoring detected in Rock Springs include Copper, TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic Acid. 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.