Surface Water Treatment Rule (SWTR) violations in Wyoming
31 active public water systems in Wyoming had a Surface Water Treatment Rule (SWTR) violation in the past three years, 7 of them in the latest quarter of EPA's data. What Surface Water Treatment Rule (SWTR) is and why it matters.
Systems with a Surface Water Treatment Rule (SWTR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Ynp-Tower Junction Ranger Station Yellowstone Np · Teton County |
1,050 | 1 | 0 | |
|
Hanna, Town of Hanna · Carbon County |
841 | 2 | 0 | |
|
Buffalo Bill Dam Visitor Center Cody · Park County |
500 | 1 | 0 | |
|
Camp Loll Boy Scouts of America Teton County |
320 | 2 | 0 | |
|
Camp Wyoba and Lions Club Casper · Natrona County |
105 | 3 | 1 | |
|
Turnerville Water and Sewer District Bedford · Lincoln County |
90 | 4 | 1 | |
|
Flying V Cambria Inn Newcastle · Weston County |
30 | 1 | 0 | |
|
Ynp-Canyon Village Yellowstone Np · Park County |
4,300 | 2 | 0 | |
|
Ynp-Mammoth Hot Springs Yellowstone Np · Park County |
2,600 | 1 | 0 | |
|
Lyman, Town of Lyman · Uinta County |
2,203 | 1 | 0 | |
|
Ethete Water System County |
1,950 | 4 | 1 | |
|
WY Dot-Fort Steele Rest Area Rawlins · Carbon County |
1,660 | 2 | 0 | |
|
Vista West Water Company Casper · Natrona County |
1,600 | 1 | 0 | |
|
Ynp-Norris Yellowstone Np · Park County |
1,515 | 3 | 0 | |
|
Pioneer Water & Sewer District Mills · Natrona County |
1,500 | 3 | 1 | |
|
Ynp Madison Junction Water System Yellowstone Nt · Teton County |
1,205 | 2 | 0 | |
|
WE Soda Alkali, LLC Green River · Sweetwater County |
950 | 2 | 0 | |
|
Veterans Administration Medical Center Sheridan · Sheridan County |
802 | 5 | 1 | |
|
Antelope Butte Ski Area Dayton · Big Horn County |
527 | 3 | 0 | |
|
Jim Bridger Power Plant Point Of Rocks · Sweetwater County |
450 | 1 | 0 | |
|
Natrona County Int'l Airport Casper · Natrona County |
423 | 3 | 0 | |
|
Rock Springs/green River KOA Rock Springs · Sweetwater County |
415 | 1 | 0 | |
|
Terrace I MHC Casper · Natrona County |
336 | 1 | 0 | |
|
Exxon Mobil Shute Creek Gas Plant Kemmerer · Lincoln County |
250 | 3 | 0 | |
|
Red Lane Domestic Water, Inc. Thermopolis · Hot Springs County |
110 | 6 | 2 | |
|
Btnf-Granite Creek CG Jackson · Teton County |
100 | 1 | 0 | |
|
Snake River Mobile Home Park Jackson · Teton County |
100 | 5 | 2 | |
|
Brinton Museum Big Horn · Sheridan County |
69 | 2 | 0 | |
|
Brooks Lake Lodge Dubois · Fremont County |
67 | 2 | 0 | |
|
Emerald River Estates Green River · Sweetwater County |
62 | 3 | 0 | |
|
Oakley Water, LLC Kemmerer · Lincoln County |
39 | 4 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Surface Water Treatment Rule (SWTR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Surface Water Treatment Rule (SWTR) alone.
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.