Wyoming Radon Levels
21Zone 1 (High)
2Zone 2 (Moderate)
0Zone 3 (Low)
91% of counties in Wyoming are classified as EPA Zone 1 (highest radon potential), meaning predicted average indoor radon levels exceed 4 pCi/L — the EPA action level. The EPA recommends that all homes be tested for radon, regardless of zone classification.
| County | EPA Zone | Risk Level |
|---|---|---|
| Albany County | Zone 1 | Highest Potential |
| Big Horn County | Zone 1 | Highest Potential |
| Campbell County | Zone 1 | Highest Potential |
| Carbon County | Zone 1 | Highest Potential |
| Converse County | Zone 1 | Highest Potential |
| Crook County | Zone 1 | Highest Potential |
| Fremont County | Zone 1 | Highest Potential |
| Goshen County | Zone 1 | Highest Potential |
| Hot Springs County | Zone 1 | Highest Potential |
| Johnson County | Zone 1 | Highest Potential |
| Laramie County | Zone 1 | Highest Potential |
| Lincoln County | Zone 1 | Highest Potential |
| Natrona County | Zone 1 | Highest Potential |
| Niobrara County | Zone 1 | Highest Potential |
| Park County | Zone 1 | Highest Potential |
| Platte County | Zone 2 | Moderate Potential |
| Sheridan County | Zone 1 | Highest Potential |
| Sublette County | Zone 1 | Highest Potential |
| Sweetwater County | Zone 1 | Highest Potential |
| Teton County | Zone 1 | Highest Potential |
| Uinta County | Zone 1 | Highest Potential |
| Washakie County | Zone 1 | Highest Potential |
| Weston County | Zone 2 | Moderate Potential |