Cyanide violations in Wyoming
23 active public water systems in Wyoming had a Cyanide violation in the past three years. What Cyanide is and why it matters.
Health effects: Acute high-dose cyanide exposure interferes with cellular oxygen use and can cause rapid deterioration of the central nervous system, including headache, dizziness, and in severe cases, loss of consciousness. Chronic exposure at lower levels is associated with thyroid dysfunction and nerve damage. Most drinking water violations pose chronic rather than acute risk.
Systems with a Cyanide violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Jackson, Town of Jackson · Teton County |
24,760 | 5 | 1 | |
|
Rawlins Water Supply, City of Rawlins · Carbon County |
9,006 | 6 | 1 | |
|
Ynp-Old Faithful Yellowstone Np · Teton County |
7,745 | 5 | 0 | |
|
Newcastle, City of Newcastle · Weston County |
3,595 | 4 | 0 | |
|
Arng-Camp Guernsey Cantonment Camp Guernsey · Platte County |
2,000 | 7 | 0 | |
|
Saratoga, Town of Saratoga · Carbon County |
1,720 | 6 | 0 | |
|
Lusk, Town of Lusk · Niobrara County |
1,576 | 4 | 0 | |
|
Marbleton, Town of Marbleton · Sublette County |
861 | 7 | 1 | |
|
Broken Wheel Truck Stop Douglas · Converse County |
540 | 6 | 2 | |
|
Cokeville, Town of Cokeville · Lincoln County |
535 | 9 | 0 | |
|
Pub Place Jackson · Teton County |
497 | 6 | 0 | |
|
Lingle, Town of Lingle · Goshen County |
486 | 5 | 0 | |
|
LA Grange, Town of La Grange · Goshen County |
448 | 4 | 0 | |
|
West End Water District Newcastle · Weston County |
225 | 6 | 1 | |
|
North Alpine I&s District Alpine · Lincoln County |
200 | 9 | 0 | |
|
Mountain View Acres Riverton · Fremont County |
165 | 8 | 0 | |
|
Water Unlimited, Incorporated Newcastle · Weston County |
144 | 7 | 2 | |
|
Farview Water and Sewer District Riverton · Fremont County |
60 | 5 | 1 | |
|
Mountain Village Parks Big Piney · Sublette County |
53 | 10 | 5 | |
|
Evergreen Mobile Home Park Cheyenne · Laramie County |
35 | 10 | 2 | |
|
Teton Science School-Wilson Campus Jackson · Teton County |
31 | 7 | 0 | |
|
Broken Wrench LLC Casper · Natrona County |
30 | 6 | 0 | |
|
Hagens Estates Gillette · Campbell County |
29 | 9 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Cyanide, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Cyanide 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.