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 |
| Williams Field Services-Opal | Opal, WY | 41 | 123 | - |
| Jeffrey City Water & Sewer District | Jeffrey City, WY | 40 | 598 | - |
| Kirby, Town Of | Kirby, WY | 40 | 39 | - |
| Spotted Horse Ranch | Jackson, WY | 40 | 18 | - |
| Parkman Bar | Parkman, WY | 40 | 28 | - |
| Trail Shop | Cody, WY | 40 | 34 | - |
| YMCA of the Big Horns Camp Roberts | Sheridan, WY | 40 | 80 | - |
| J-W Subdivision Association | Jackson, WY | 40 | 8 | - |
| Elkhorn Trailer Park | Dayton, WY | 40 | 1 | - |
| Paintbrush Motel | Pavillion, WY | 40 | 5 | - |
| Power Resources Inc/Smith Ranch | Glenrock, WY | 40 | 36 | - |
| Ranch A | Beulah, WY | 40 | 1 | - |
| Rimrock Ranch | Cody, WY | 40 | 1 | - |
| Bighorn Nf-Leigh Creek Dump Station | Sheridan, WY | 40 | 2 | - |
| Rafter D Improvement & Service District | Gillette, WY | 40 | 0 | - |
| Mbnf-Mirror Lake Pg | Saratoga, WY | 40 | 21 | - |
| Mbnf-Ryan Park Cg | Saratoga, WY | 40 | 26 | - |
| Targhee Nf-Trail Creek Cg | Driggs, WY | 40 | 18 | - |
| Gtnp-Lupine Meadows | Moose, WY | 40 | 1 | - |
| Bighorn Canyon Nat'l Rec. Area | Lovell, WY | 40 | 4 | - |
| Shoshone Nf-Rex Hale Cg | Cody, WY | 40 | 25 | - |
| Bhnf-Ranger Creek Cg | Sheridan, WY | 40 | 17 | - |
| Sunset Grill & River View Inn | Alcova, WY | 39 | 38 | - |
| Oakley Water, LLC | Kemmerer, WY | 39 | 55 | - |
| Fox Ridge Water System | Gillette, WY | 38 | 1 | - |
| Crt Gowdy Stpk-Crystal D.& Twin Lks Cgs | Cheyenne, WY | 37 | 6 | - |
| J & E Infanger, Inc. | Jackson, WY | 36 | 28 | - |
| Lakeview Mobile Home Park | Gillette, WY | 36 | 70 | - |
| Uxu Ranch LLC | Cody, WY | 35 | 52 | - |
| Absaroka Ranch | Dubois, WY | 35 | 14 | - |
| Exxon Mobil-Labarge SW Division | Kemmerer, WY | 35 | 7 | - |
| Big Valley & Crossed Arrows Imp Dist | Meeteetse, WY | 35 | 112 | - |
| Cottonwood Country Club | Torrington, WY | 35 | 1 | - |
| Wyoming High Country, LLC | Lovell, WY | 35 | 10 | - |
| Rendezvous Meadows Golf Course | Pinedale, WY | 35 | 2 | - |
| Ten Sleep Rock Ranch | Ten Sleep, WY | 35 | 2 | - |
| Little Horsethief Canyon HOA | Wilson, WY | 35 | 11 | - |
| Bhnf-Tie Hack Cg | Sheridan, WY | 35 | 16 | - |
| Second Fike Subdivision | Pavillion, WY | 34 | 22 | - |
| Ring Lake Ranch | Dubois, WY | 34 | 20 | - |
| Devils Tower Gulch | Devils Tower, WY | 34 | 9 | - |
| Eagle Creek RV Park | Casper, WY | 33 | 29 | - |
| Buckmiller Enterprises, LLC | Gillette, WY | 33 | 1 | - |
| Creekside Lodge | Cody, WY | 32 | 35 | - |
| Blackwater Creek Ranch | Tucson, WY | 32 | 44 | - |
| Little Powder School | Gillette, WY | 32 | 3 | - |
| Osmond I&s District | Afton, WY | 31 | 256 | - |
| Recluse School #2 | Gillette, WY | 31 | 18 | - |
| Teton Science School-Wilson Campus | Jackson, WY | 31 | 73 | - |
| Kinnear Store | Kinnear, WY | 31 | 65 | - |