Wyoming Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Wyoming has 317 active community water systems in this extract. PlainEnviro's health-based slice lists 730 violation records across 50 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 317 community water systems in Wyoming. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | DIXON, TOWN OF Dixon | 93 | Yes |
| 2 | LANCE CREEK WATER DISTRICT Lance Creek | 64 | Yes |
| 3 | BAGGS, TOWN OF Baggs | 50 | Yes |
| 4 | KEMMERER-DIAMONDVILLE JPB Kemmerer | 35 | Yes |
| 5 | COTTONWOOD ACRES Torrington | 30 | Yes |
| 6 | STONE CREEK HOA Torrington | 30 | Yes |
| 7 | LITTLE AMERICA HOTELS & RESORTS, INC- WY Little America | 26 | Yes |
| 8 | YNP-OLD FAITHFUL Yellowstone | 26 | Yes |
| 9 | BUFFALO, CITY OF Buffalo | 20 | Yes |
| 10 | COKEVILLE, TOWN OF Cokeville | 17 | Yes |
| 11 | BENNOR ESTATES & IMPROVEMENT DISTRICT Gillette | 13 | Yes |
| 12 | KEY LARGO UTILITIES Sheridan | 11 | Yes |
| 13 | ETHETE WATER SYSTEM Fort Washakie | 10 | Yes |
| 14 | RIVERMEADOWS WATER DISTRICT Jackson | 10 | Yes |
| 15 | RED WATER DISTRIBUTION LLC Aladdin | 9 | Yes |
| 16 | MILLS, CITY OF Mills | 9 | Yes |
| 17 | BROKEN WRENCH LLC Casper | 9 | Yes |
| 18 | RAWLINS WATER SUPPLY, CITY OF Rawlins | 8 | Yes |
| 19 | POTLATCH TRAILER COURT Torrington | 8 | Yes |
| 20 | RIMROCK WATER COMPANY LLC Aladdin | 7 | Yes |
| 21 | MANVILLE, TOWN OF Manville | 7 | Yes |
| 22 | BURLINGTON, TOWN OF Burlington | 7 | Yes |
| 23 | GRANGER, TOWN OF Granger | 6 | Yes |
| 24 | PAVILLION, TOWN OF Pavillion | 6 | Yes |
| 25 | LEISURE VALLEY INC/ STAR VALLEY RV PARK Grover | 6 | Yes |
| 26 | ROZET RANCHETTES I&S DISTRICT Gillette | 6 | Yes |
| 27 | OWL CREEK WATER DISTRICT Thermopolis | 6 | Yes |
| 28 | SARATOGA, TOWN OF Saratoga | 5 | Yes |
| 29 | HOY MOBILE HOME PARK Gillette | 5 | Yes |
| 30 | WHEATLAND, TOWN OF Wheatland | 5 | Yes |
| 31 | LA BARGE, TOWN OF La Barge | 5 | Yes |
| 32 | STAR VALLEY RANCH, TOWN OF Star Valley Ranch | 5 | Yes |
| 33 | VETERANS ADMINISTRATION MEDICAL CENTER Sheridan | 5 | Yes |
| 34 | MEDICINE BOW, TOWN OF Medicine Bow | 4 | Yes |
| 35 | JEFFREY CITY WATER & SEWER DISTRICT Jeffrey City | 4 | Yes |
| 36 | ALPINE, TOWN OF Alpine | 4 | Yes |
| 37 | LANDER, CITY OF Lander | 4 | Yes |
| 38 | BEAR RIVER REGIONAL JOINT POWERS Bear River | 4 | Yes |
| 39 | KENNINGTON SPRINGS PIPELINE Fairview | 4 | Yes |
| 40 | WRANGLER ESTATES Gillette | 4 | Yes |
| 41 | BEDFORD WATER & SEWER DISTRICT Bedford | 3 | Yes |
| 42 | LUSK, TOWN OF Lusk | 3 | Yes |
| 43 | RIVERTON, CITY OF Riverton | 3 | Yes |
| 44 | ROCK SPRINGS/GREEN RIVER JPB Green River | 3 | Yes |
| 45 | WAMSUTTER, TOWN OF Wamsutter | 3 | Yes |
| 46 | GROVER WATER & SEWER DISTRICT Grover | 3 | Yes |
| 47 | MOUNTAIN VIEW ACRES Pavillion | 3 | Yes |
| 48 | ALBIN, TOWN OF Albin | 3 | Yes |
| 49 | MARBLETON, TOWN OF Marbleton | 3 | Yes |
| 50 | HIDE-A-WAY MOBILE VILLAGE Cheyenne | 3 | Yes |
Most Common Contaminants in Wyoming
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Groundwater Rule | 144 | 69 |
| TTHM | 128 | 8 |
| Total Haloacetic Acids (HAA5) | 96 | 6 |
| Combined Radium (-226 and -228) | 74 | 3 |
| Nitrate-Nitrite | 55 | 4 |
| Long Term 2 Enhanced Surface Water Treatment Rule | 49 | 12 |
| Lead and Copper Rule | 44 | 14 |
| Revised Total Coliform Rule | 26 | 9 |
| Combined Uranium | 22 | 3 |
| Interim Enhanced Surface Water Treatment Rule | 22 | 7 |
| Arsenic | 17 | 1 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 16 | 2 |
| Surface Water Treatment Rule | 13 | 8 |
| LEAD AND COPPER RULE REVISIONS | 7 | 7 |
| Gross Alpha, Excl. Radon and U | 7 | 2 |
Cities with Water Quality Issues
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Wyoming are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.