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 |
|---|---|---|---|---|
| Cheyenne Board of Public Utilities | Cheyenne, WY | 64,165 | 12 | Clean |
| Casper, City Of | Casper, WY | 59,000 | 3 | Clean |
| Laramie, City Of | Laramie, WY | 32,395 | 18 | Clean |
| Gillette, City Of | Gillette, WY | 32,222 | 6 | Clean |
| Jackson, Town Of | Jackson, WY | 24,760 | 283 | Detected |
| Rock Springs, City Of | Rock Springs, WY | 24,000 | 5 | Clean |
| Sheridan, City Of | Sheridan, WY | 22,700 | 22 | Clean |
| Evanston, City Of | Evanston, WY | 12,000 | 3 | Clean |
| Green River, City Of | Green River, WY | 10,500 | 5 | Clean |
| Riverton, City Of | Riverton, WY | 10,330 | 11 | Detected |
| Cody, City Of | Cody, WY | 10,224 | 11 | Clean |
| South Cheyenne Water & Sewer District | Cheyenne, WY | 10,000 | 14 | Clean |
| Rawlins Water Supply, City Of | Rawlins, WY | 9,006 | 72 | Clean |
| Ynp-Old Faithful | Yellowstone, WY | 7,675 | 35 | Clean |
| Lander, City Of | Lander, WY | 7,615 | 68 | Clean |
| Northwest Rural Water District | Cody, WY | 7,330 | 4 | Clean |
| Torrington Municipal Water Dept, City Of | Torrington, WY | 6,847 | 37 | Clean |
| Douglas, City Of | Douglas, WY | 6,400 | 10 | Detected |
| Powell, City Of | Powell, WY | 6,310 | 4 | Clean |
| Ynp - Lake Village | Yellowstone, WY | 5,925 | 41 | - |
| Usaf F.e. Warren Afb | F.e. Warren Afb, WY | 5,500 | 23 | Clean |
| Worland Utilities Commission | Worland, WY | 5,487 | 19 | Clean |
| Gtnp-Colter Bay Village | Moose, WY | 4,514 | 3 | Clean |
| Buffalo, City Of | Buffalo, WY | 4,419 | 45 | Clean |
| Ynp-Canyon Village | Yellowstone, WY | 4,300 | 9 | Clean |
| Mills, City Of | Mills, WY | 4,050 | 12 | Clean |
| Bar Nunn, Town Of | Bar Nunn, WY | 4,000 | 16 | Clean |
| Wheatland, Town Of | Wheatland, WY | 3,659 | 227 | Clean |
| Newcastle, City Of | Newcastle, WY | 3,595 | 240 | Clean |
| Ynp-Grant Village | Yellowstone, WY | 3,513 | 1 | - |
| Kemmerer-Diamondville Jpb | Kemmerer, WY | 3,348 | 53 | Clean |
| Greybull, Town Of | Greybull, WY | 3,260 | 93 | - |
| Devils Tower National Monument | Devils Tower, WY | 3,071 | 6 | - |
| White Mountain W&S District | Rock Springs, WY | 3,000 | 0 | - |
| Thermopolis, Town Of | Thermopolis, WY | 2,775 | 29 | - |
| Evansville, Town Of | Casper, WY | 2,728 | 7 | - |
| Ynp-Mammoth Hot Springs | Yellowstone National Park, WY | 2,600 | 14 | - |
| Wright Water & Sewer District | Wright, WY | 2,500 | 8 | - |
| Grand Targhee Resort | Alta, WY | 2,500 | 3 | - |
| Glenrock, Town Of | Glenrock, WY | 2,466 | 9 | - |
| Sleepy Hollow Subdivision | Gillette, WY | 2,400 | 24 | - |
| Lovell, Town Of | Lovell, WY | 2,360 | 27 | Clean |
| Lyman, Town Of | Lyman, WY | 2,203 | 32 | - |
| Star Valley Ranch, Town Of | Star Valley Ranch, WY | 2,030 | 66 | - |
| Rendezvous (R) Park | Wilson, WY | 2,006 | 1 | - |
| Little America Hotels & Resorts, Inc- WY | Little America, WY | 2,004 | 108 | - |
| Afton, Board of Pub Utilities | Afton, WY | 2,000 | 50 | - |
| Arng-Camp Guernsey Cantonment | Guernsey, WY | 2,000 | 19 | - |
| Leisure Valley Inc/ Star Valley RV Park | Grover, WY | 1,910 | 665 | - |
| Pinedale Municipal WS | Pinedale, WY | 1,900 | 93 | - |
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