What was found in Cheyenne's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 12100 µg/L 121% of the EPA limit, in the worst sample — 10000 µg/L | 9/15 | SYR4 |
| Nitrate | 7300 µg/L 73% of the EPA limit 10000 µg/L | 6/15 | SYR4 |
| Copper | 990 µg/L 76% of the EPA limit 1300 µg/L | 15/15 | SYR4 |
| Fluoride | 900 µg/L 23% of the EPA limit 4000 µg/L | 9/15 | SYR4 |
| Lead | 380 µg/L 2533% of the EPA limit, in the worst sample — 15 µg/L | 12/15 | SYR4 |
| Barium | 200 µg/L 10% of the EPA limit 2000 µg/L | 4/15 | SYR4 |
| TTHM | 90 µg/L 113% of the EPA limit, in the worst sample — 80 µg/L | 11/15 | SYR4 |
| Chromium | 60 µg/L 60% of the EPA limit 100 µg/L | 2/15 | SYR4 |
| Chloroform | 58 µg/L No EPA limit set | 6/15 | SYR4 |
| Total Haloacetic Acids (HAA5) | 44 µg/L 73% of the EPA limit 60 µg/L | 10/15 | SYR4 |
| Trichloroacetic Acid | 22 µg/L No EPA limit set | 5/15 | SYR4 |
| Combined Uranium | 21.4 µg/L 71% of the EPA limit 30 µg/L | 9/15 | SYR4 |
| Dichloroacetic Acid | 20 µg/L No EPA limit set | 5/15 | SYR4 |
| Bromodichloromethane | 15 µg/L No EPA limit set | 7/15 | SYR4 |
| Gross Alpha, Excl. Radon And U | 12.4 pCi/L 83% of the EPA limit 15 pCi/L | 9/15 | SYR4 |
| Bromoform | 11 µg/L No EPA limit set | 3/15 | SYR4 |
| Endothall | 9 µg/L 9% of the EPA limit 100 µg/L | 1/15 | SYR4 |
| Arsenic | 6.05 µg/L 61% of the EPA limit 10 µg/L | 9/15 | SYR4 |
| Dibromoacetic Acid | 4.3 µg/L No EPA limit set | 8/15 | SYR4 |
| Selenium | 4.21 µg/L 8.4% of the EPA limit 50 µg/L | 7/15 | SYR4 |
| Combined Radium (-226 And -228) | 4.2 pCi/L 84% of the EPA limit 5 pCi/L | 8/15 | SYR4 |
| Dibromochloromethane | 3.3 µg/L No EPA limit set | 8/15 | SYR4 |
| Gross Beta Particle Activity | 3.2 pCi/L No EPA limit set | 1/15 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.4 µg/L 40% of the EPA limit 6 µg/L | 1/15 | SYR4 |
| Monochloroacetic Acid | 2.3 µg/L No EPA limit set | 5/15 | SYR4 |
| Monobromoacetic Acid | 1.1 µg/L No EPA limit set | 4/15 | SYR4 |
| Tetrachloroethylene | 0.7700 µg/L 15% of the EPA limit 5 µg/L | 1/15 | SYR4 |
| Lead | 0.0150 mg/L 100% of the EPA limit 0.0150 mg/L | 15/15 | LCR |
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, Copper, Fluoride, Lead. The full list, with the highest level found 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.