Public Water Systems
766 active public water systems in WY, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
| Glendo St Park-Bennett Hill Cg | Guernsey, WY | 52 | 1 | - |
| Lake Water Co., LLC. | Glendo, WY | 51 | 13 | - |
| C-V Ranches (Boces Reg V) | Wilson, WY | 51 | 58 | - |
| Seminoe Boat Club, Inc. | Rawlins, WY | 50 | 17 | - |
| Keyhole Resort/Marina | Gillette, WY | 50 | 35 | - |
| Buffalo Valley Water District | Moran, WY | 50 | 46 | - |
| Deer Haven Lodge | Oronoco, WY | 50 | 38 | - |
| Glendo St Park Whiskey Gulch | Guernsey, WY | 50 | 3 | - |
| Glendo St Park Cottonwood | Guernsey, WY | 50 | 11 | - |
| Buffalo Bill St Pk North Fork | Cody, WY | 50 | 2 | - |
| Guernsey St Park Long Canyon | Guernsey, WY | 50 | 4 | - |
| Guernsey St Park Sandy Beach 1 | Guernsey, WY | 50 | 3 | - |
| Guernsey St Park Sandy Beach 2 | Guernsey, WY | 50 | 3 | - |
| Lazy L and B Ranch | Dubois, WY | 50 | 17 | - |
| The Den | Firestone, WY | 50 | 37 | - |
| NE WY Regional Airport | Gillette, WY | 50 | 23 | - |
| Four J School Campbell Sch Dis | Gillette, WY | 50 | 46 | - |
| Mhvc Jackson Cg | Casper, WY | 50 | 2 | - |
| Alcova Lakeview Estates I | Casper, WY | 50 | 1 | - |
| Alta School | Jackson, WY | 50 | 2 | - |
| Wolf Den | Thayne, WY | 50 | 5 | - |
| Green Creek Inn & RV | Cody, WY | 50 | 9 | - |
| Orin Junction Truck Stop | Douglas, WY | 50 | 24 | - |
| Sundance Meadows Spid | Douglas, WY | 50 | 5 | - |
| Scharen Subdivision | Greybull, WY | 50 | 2 | - |
| Beulah Land Water | Sioux Falls, WY | 50 | 11 | - |
| Akal Energy/Tumbleweed Express | Laramie, WY | 50 | 15 | - |
| Hwy 390 LLC | Wilson, WY | 50 | 56 | - |
| Gtnp-Moran Buffalo Ranger Station | Moose, WY | 50 | 0 | - |
| Btnf-Fremont Lake Cg | Jackson, WY | 50 | 8 | - |
| Btnf-Blackrock Work Center | Jackson, WY | 50 | 679 | - |
| Shoshone Nf-Eagle Creek Cg | Cody, WY | 50 | 6 | - |
| Mile-HI I&s District | Casper, WY | 48 | 9 | - |
| Bitterroot Ranch | Dubois, WY | 47 | 20 | - |
| Lance Creek Water District | Lance Creek, WY | 45 | 361 | - |
| Kennington Springs Pipeline | Fairview, WY | 45 | 129 | - |
| American Colloid-Colony East | Colony, WY | 45 | 12 | - |
| Larson's Park | Guernsey, WY | 45 | 7 | - |
| Lost Cabin Gas Plant (Contango Res, LLC) | Lysite, WY | 45 | 24 | - |
| Hilliard Ward (Lds Church) | Salt Lake City, WY | 45 | 19 | - |
| Meadow Springs Imp & Serv | Gillette, WY | 45 | 42 | - |
| Wilson Hardware | Salt Lake City, WY | 45 | 28 | - |
| Akal Energy-Buford Outpost | Laramie, WY | 44 | 9 | - |
| Hawk Springs State Recreation Area | Guernsey, WY | 44 | 0 | - |
| Devils Tower View | Devils Tower, WY | 43 | 24 | - |
| Edelweiss | Clark, WY | 42 | 27 | - |
| Juniper Park Water Association | Pavillion, WY | 42 | 0 | - |
| Wapiti Village RV Park | Alpine, WY | 42 | 0 | - |
| Copperleaf Water System | Cody, WY | 42 | 4 | - |
| Elephant Head Lodge | Cody, WY | 41 | 25 | - |