All water systems in Wyoming
773 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cheyenne Board of Public Utilities Cheyenne · Laramie County |
64,165 | 0 | 0 | |
|
Casper, City of Casper · Natrona County |
59,000 | 0 | 0 | |
|
Laramie, City of Laramie · Albany County |
32,395 | 0 | 0 | |
|
Gillette, City of Gillette · Campbell County |
32,222 | 1 | 0 | |
|
Jackson, Town of Jackson · Teton County |
24,760 | 5 | 1 | |
|
Rock Springs, City of Rock Springs · Sweetwater County |
24,000 | 0 | 0 | |
|
Sheridan, City of Sheridan · Sheridan County |
22,700 | 0 | 0 | |
|
Evanston, City of Evanston · Uinta County |
11,727 | 0 | 0 | |
|
Green River, City of Green River · Sweetwater County |
10,500 | 0 | 0 | |
|
Riverton, City of Riverton · Fremont County |
10,330 | 3 | 0 | |
|
Cody, City of Cody · Park County |
10,224 | 2 | 0 | |
|
South Cheyenne Water & Sewer District Cheyenne · Laramie County |
10,000 | 1 | 0 | |
|
Rawlins Water Supply, City of Rawlins · Carbon County |
9,006 | 6 | 1 | |
|
Ynp-Old Faithful Yellowstone Np · Teton County |
7,745 | 5 | 0 | |
|
Lander, City of Lander · Fremont County |
7,615 | 1 | 0 | |
|
Northwest Rural Water District Cody · Park County |
7,330 | 0 | 0 | |
|
Torrington Municipal Water Dept, City of Torrington · Goshen County |
6,847 | 0 | 0 | |
|
Douglas, City of Douglas · Converse County |
6,400 | 0 | 0 | |
|
Powell, City of Powell · Park County |
6,310 | 1 | 0 | |
|
Ynp Lake Village Yellowstone Nt · Teton County |
5,925 | 5 | 1 | |
|
Usaf F.e. Warren Afb Cheyenne · Laramie County |
5,500 | 0 | 0 | |
|
Worland Utilities Commission Worland · Washakie County |
4,787 | 0 | 0 | |
|
Gtnp-Colter Bay Village Moose · Teton County |
4,514 | 0 | 0 | |
|
Buffalo, City of Buffalo · Johnson County |
4,419 | 1 | 0 | |
|
Ynp-Canyon Village Yellowstone Np · Park County |
4,300 | 2 | 0 | |
|
Arapahoe Comm Water System County |
4,100 | 1 | 0 | |
|
Mills, City of Mills · Natrona County |
4,050 | 1 | 0 | |
|
Bar Nunn, Town of Mills · Natrona County |
4,000 | 0 | 0 | |
|
Wheatland, Town of Wheatland · Platte County |
3,659 | 6 | 1 | |
|
Newcastle, City of Newcastle · Weston County |
3,595 | 4 | 0 | |
|
Ynp-Grant Village Yellowstone Np · Teton County |
3,513 | 0 | 0 | |
|
Kemmerer-Diamondville Jpb Kemmerer · Lincoln County |
3,348 | 1 | 0 | |
|
Wright Water & Sewer District Wright · Campbell County |
3,207 | 0 | 0 | |
|
Devils Tower National Monument Devils Tower · Crook County |
3,071 | 1 | 0 | |
|
White Mountain W&s District Rock Springs · Sweetwater County |
3,000 | 0 | 0 | |
|
Star Valley Ranch, Town of Star Valley Ranch, Thayne · Lincoln County |
2,894 | 3 | 1 | |
|
Evansville, Town of Evansville · Natrona County |
2,873 | 1 | 0 | |
|
Thermopolis, Town of Thermopolis · Hot Springs County |
2,775 | 0 | 0 | |
|
Fort Washakie County |
2,620 | 2 | 0 | |
|
Ynp-Mammoth Hot Springs Yellowstone Np · Park County |
2,600 | 1 | 0 | |
|
Grand Targhee Resort Alta · Teton County |
2,500 | 0 | 0 | |
|
Glenrock, Town of Glenrock · Converse County |
2,466 | 1 | 1 | |
|
Sleepy Hollow Subdivision Gillette · Campbell County |
2,400 | 0 | 0 | |
|
Lovell, Town of Lovell · Big Horn County |
2,250 | 0 | 0 | |
|
Lyman, Town of Lyman · Uinta County |
2,203 | 1 | 0 | |
|
Greybull, Town of Greybull · Big Horn County |
2,080 | 3 | 1 | |
|
Rendezvous (r) Park Teton County |
2,006 | 0 | 0 | |
|
Pinedale Municipal WS Pinedale · Sublette County |
2,005 | 1 | 0 | |
|
Little America Hotels & Resorts, Inc WY Little America · Sweetwater County |
2,004 | 1 | 1 | |
|
Afton, Board of Pub Utilities Afton · Lincoln County |
2,000 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Wyoming records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.