Public Water Systems
766 active water systems in WY.
| System Name | Location | Population | Violations | PFAS |
|---|---|---|---|---|
| CHEYENNE BOARD OF PUBLIC UTILITIES | CHEYENNE, WY | 64,165 | 12 | Detected |
| CASPER, CITY OF | CASPER, WY | 59,000 | 3 | Detected |
| LARAMIE, CITY OF | LARAMIE, WY | 32,395 | 18 | Clean |
| GILLETTE, CITY OF | GILLETTE, WY | 32,222 | 6 | Detected |
| JACKSON, TOWN OF | JACKSON, WY | 24,760 | 283 | Detected |
| ROCK SPRINGS, CITY OF | ROCK SPRINGS, WY | 24,000 | 5 | Detected |
| 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 | Detected |
| 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 | Detected |
| YNP-OLD FAITHFUL | YELLOWSTONE, WY | 7,675 | 35 | Detected |
| 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 | Detected |
| 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 | Detected |
| MILLS, CITY OF | MILLS, WY | 4,050 | 12 | Detected |
| BAR NUNN, TOWN OF | BAR NUNN, WY | 4,000 | 16 | Detected |
| WHEATLAND, TOWN OF | WHEATLAND, WY | 3,659 | 227 | Detected |
| NEWCASTLE, CITY OF | NEWCASTLE, WY | 3,595 | 240 | Detected |
| 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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