What was found in Cheyenne'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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 705 µg/L 7% of the EPA limit 10000 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2019
Highest in the city: 11300 µg/L — MILLER LOWER MOBILE HOME PARK · 30 people · 2019 | 9/15 | SYR4 |
| Nitrate | 700 µg/L 7% of the EPA limit 10000 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2019
Highest in the city: 7300 µg/L — EVERGREEN MOBILE HOME PARK · 35 people · 2017 | 6/15 | SYR4 |
| Fluoride | 610 µg/L 15% of the EPA limit 4000 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2019
Highest in the city: 840 µg/L — HIDE-A-WAY MOBILE VILLAGE · 107 people · 2018 | 9/15 | SYR4 |
| Copper | 450 µg/L 35% of the EPA limit 1300 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2017
Highest in the city: 642 µg/L — USAF F.E. WARREN AFB · 5,500 people · 2018 | 15/15 | SYR4 |
| Barium | 47 µg/L 2.4% of the EPA limit 2000 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2019
Highest in the city: 200 µg/L — HIDE-A-WAY MOBILE VILLAGE · 107 people · 2018 | 4/15 | SYR4 |
| Lead | 100.1 µg/L 667% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2017 | 12/15 | SYR4 |
| TTHM | 57.3 µg/L 72% of the EPA limit 80 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2019
Highest in the city: 66.325 µg/L — CIMMARON VILLAGE · 327 people · 2019 | 11/15 | SYR4 |
| Chromium | 60 µg/L 60% of the EPA limit 100 µg/L Highest in the city: HIDE-A-WAY MOBILE VILLAGE · 107 people · 2018 | 2/15 | SYR4 |
| Chloroform | 50.72 µg/L No EPA limit set Highest in the city: CIMMARON VILLAGE · 327 people · 2019 | 6/15 | SYR4 |
| Total Haloacetic Acids (HAA5) | 33.325 µg/L 56% of the EPA limit 60 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2019
Highest in the city: 41.75 µg/L — ENGLEWOOD VILLAGE MHP · 152 people · 2019 | 10/15 | SYR4 |
| Combined Uranium | 6.2878 µg/L 21% of the EPA limit 30 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2018
Highest in the city: 21.38 µg/L — EVERGREEN MOBILE HOME PARK · 35 people · 2017 | 9/15 | SYR4 |
| Trichloroacetic Acid | 21 µg/L No EPA limit set Highest in the city: ENGLEWOOD VILLAGE MHP · 152 people · 2019 | 5/15 | SYR4 |
| Dichloroacetic Acid | 18.75 µg/L No EPA limit set Highest in the city: ENGLEWOOD VILLAGE MHP · 152 people · 2019 | 5/15 | SYR4 |
| Bromodichloromethane | 13.48 µg/L No EPA limit set Highest in the city: CIMMARON VILLAGE · 327 people · 2019 | 7/15 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.33 pCi/L 42% of the EPA limit 15 pCi/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2018
Highest in the city: 12.05 pCi/L — MOUNTAIN VIEW ESTATES (KNECHT INVTS) · 75 people · 2019 | 9/15 | SYR4 |
| Bromoform | 9.44 µg/L No EPA limit set Highest in the city: HIDE-A-WAY MOBILE VILLAGE · 107 people · 2019 | 3/15 | SYR4 |
| Endothall | 9 µg/L 9% of the EPA limit 100 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2019 | 1/15 | SYR4 |
| Arsenic | 1.5 µg/L 15% of the EPA limit 10 µg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2019
Highest in the city: 6.0485 µg/L — EVERGREEN MOBILE HOME PARK · 35 people · 2017 | 9/15 | SYR4 |
| Combined Radium (-226 And -228) | 4.2 pCi/L 84% of the EPA limit 5 pCi/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2018 | 8/15 | SYR4 |
| Dibromoacetic Acid | 4.155 µg/L No EPA limit set Highest in the city: HIDE-A-WAY MOBILE VILLAGE · 107 people · 2017 | 8/15 | SYR4 |
| Selenium | 4.1495 µg/L 8.3% of the EPA limit 50 µg/L Highest in the city: EVERGREEN MOBILE HOME PARK · 35 people · 2017 | 7/15 | SYR4 |
| Gross Beta Particle Activity | 3.2 pCi/L No EPA limit set Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2015 | 1/15 | SYR4 |
| Dibromochloromethane | 2.72 µg/L No EPA limit set Highest in the city: CIMMARON VILLAGE · 327 people · 2019 | 8/15 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.4 µg/L 40% of the EPA limit 6 µg/L Highest in the city: MOUNTAIN VIEW ESTATES (KNECHT INVTS) · 75 people · 2019 | 1/15 | SYR4 |
| Monochloroacetic Acid | 1.95 µg/L No EPA limit set Highest in the city: SOUTH CHEYENNE WATER & SEWER DISTRICT · 10,000 people · 2019 | 5/15 | SYR4 |
| Monobromoacetic Acid | 1.04 µg/L No EPA limit set Highest in the city: WEST WINDS · 663 people · 2019 | 4/15 | SYR4 |
| Tetrachloroethylene | 0.7580 µg/L 15% of the EPA limit 5 µg/L Highest in the city: ORCHARD VALLEY WATER COMPANY · 260 people · 2019 | 1/15 | SYR4 |
| Lead | 0.0150 mg/L 100% of the EPA limit 0.0150 mg/L Main supplier: CHEYENNE BOARD OF PUBLIC UTILITIES · 64,165 people · 2025 | 15/15 | 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 Cheyenne
| Supplier | Population served |
|---|---|
| CHEYENNE BOARD OF PUBLIC UTILITIES | 64,165 |
| SOUTH CHEYENNE WATER & SEWER DISTRICT | 10,000 |
| USAF F.E. WARREN AFB | 5,500 |
| WINCHESTER HILLS | 1,078 |
| WEST WINDS | 663 |
| BIG COUNTRY ESTATES | 615 |
| CIMMARON VILLAGE | 327 |
| ORCHARD VALLEY WATER COMPANY | 260 |
| ENGLEWOOD VILLAGE MHP | 152 |
| HIGHLAND RANCH ESTATES | 128 |
| HIDE-A-WAY MOBILE VILLAGE | 107 |
| MOUNTAIN VIEW ESTATES (KNECHT INVTS) | 75 |
| RESTWAY TRAVEL PARK | 62 |
| EVERGREEN MOBILE HOME PARK | 35 |
| MILLER LOWER MOBILE HOME PARK | 30 |
Frequently asked questions about Cheyenne tap water
Is Cheyenne tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Cheyenne. 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 Cheyenne?
15 public water suppliers report drinking-water monitoring for Cheyenne, Wyoming to the EPA. Each is listed above with its population served.
What contaminants are in Cheyenne's water?
The contaminants EPA monitoring detected in Cheyenne include Nitrate-Nitrite, Nitrate, Fluoride, Copper, 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.