Tapcensus

Selenium violations in Wyoming

22 active public water systems in Wyoming had a Selenium violation in the past three years. What Selenium is and why it matters.

Health effects: Chronic exposure above the MCL causes selenosis — characterized by hair and nail loss, peripheral neuropathy, fatigue, and gastrointestinal disturbance. Liver damage can occur with prolonged high intake. The margin between nutritional requirement and toxic dose is narrow, making the MCL an important threshold.

Systems with a Selenium violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Jackson, Town of
Jackson · Teton County 		24,760 5 1
Rawlins Water Supply, City of
Rawlins · Carbon County 		9,006 6 1
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 Selenium, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Selenium 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. Retrieved from ECHO on Oct 11, 2026.