Skip to content
lung.com

Radon zones in Wyoming

The EPA assigns every county in Wyoming to one of three radon potential zones. 21 are in Zone 1, the highest category, home to about 97% of the state's residents.

23
Counties
21
Zone 1 counties
Predicted average above 4 pCi/L
2
Zone 2 counties
Predicted average 2-4 pCi/L
0
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Wyoming

Every county in Wyoming, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 21Zone 2 · 2Zone 3 · 0

Hover a county · click to open it

County by county

All 23 Wyoming counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Albany County138k5.1%10.5%19.5
Big Horn County112k8.8%15.7%30.0
Campbell County147k6.6%15.3%30.8
Carbon County114k8.0%15.6%30.8
Converse County114k7.8%15.4%33.6
Crook County17,5927.5%13.5%26.6
Fremont County140k8.3%16.4%33.0
Goshen County113k8.1%13.9%36.2
Hot Springs County14,6619.9%14.9%40.0
Johnson County18,7598.9%14.7%24.9
Laramie County1101k6.6%13.3%32.1
Lincoln County121k7.3%14.1%20.8
Natrona County180k7.1%14.9%29.0
Niobrara County12,3549.5%16.1% -
Park County131k7.3%12.5%19.2
Sheridan County133k7.1%12.9%29.4
Sublette County18,9697.0%12.7% -
Sweetwater County141k7.0%16.1%33.3
Teton County123k4.5%9.2%11.5
Uinta County121k7.2%14.8%15.5
Washakie County17,7108.9%15.4%26.1
Platte County28,5469.1%15.0%27.7
Weston County26,8088.2%15.7%47.5

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Highest potential

Zone 1 counties in Wyoming

These 21 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere