Wyoming
Big Horn County drinking water quality
29 active public water systems serve 10,541 people in Big Horn County. 9 are compliant, 20 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
15 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lovell, Town of Lovell |
2,250 | 0 | 0 | |
|
Greybull, Town of Greybull |
2,080 | 3 | 1 | |
|
Basin, Town of Basin |
1,250 | 1 | 0 | |
|
South Big Horn County Jpb Basin |
900 | 1 | 0 | |
|
Cowley, Town of Cowley |
800 | 2 | 1 | |
|
Byron, Town of Byron |
561 | 0 | 0 | |
|
Burlington, Town of Burlington |
348 | 1 | 0 | |
|
Deaver Municipal Water System Deaver |
176 | 0 | 0 | |
|
Frannie, Town of Frannie |
160 | 1 | 0 | |
|
South End Water Users S&i District Lovell |
150 | 3 | 3 | |
|
Shell Town Water Improvement District Shell |
120 | 1 | 1 | |
|
Manderson, Town of Manderson |
110 | 2 | 0 | |
|
Greybull Heights Water Users Greybull |
84 | 0 | 0 | |
|
Hyattville S&i District Hyattville |
60 | 2 | 1 | |
|
Scharen Subdivision Greybull |
50 | 0 | 0 |
Non-community systems (14: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Antelope Butte Ski Area Dayton |
527 | 3 | 0 | |
|
Bighorn Resort LLC Worland |
154 | 2 | 0 | |
|
Medicine Lodge ST Hist Site Hyattville |
115 | 0 | 0 | |
|
Bhnf-Boulder Park CG Sheridan |
100 | 1 | 0 | |
|
Bhnf-Sitting Bull CG Ten Sleep |
100 | 1 | 0 | |
|
American Colloid Company Lovell |
93 | 1 | 0 | |
|
Georgia-Pacific Gypsum LLC Lovell |
90 | 0 | 0 | |
|
Bentonite Performance Minerals/lovell Lovell |
68 | 0 | 0 | |
|
Bhnf-Ranger Creek CG Sheridan |
40 | 2 | 0 | |
|
Bighorn Canyon Nat'l Rec. Area Lovell |
40 | 1 | 0 | |
|
Wyoming High Country, LLC Lovell |
35 | 0 | 0 | |
|
Bighorn Nf-Tyrrell Work Center Sheridan |
30 | 1 | 0 | |
|
Blm Five Springs Campground Cody |
25 | 1 | 0 | |
|
Camp Paintrock Hyattville |
25 | 3 | 1 |
Inactive systems (5, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.