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State overview
Radon in Wyoming
Of Wyoming's 23 counties and county equivalents, EPA places 21 in Zone 1, 2 in Zone 2. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
Wyoming stories
- Wyoming students raise radon gas awareness through artworkYour Wyoming Link · 2026-05-27
- Consider Radon Testing for Your Wyoming HomeWyoming Department of Health (.gov) · 2026-01-13
- Wyoming State Geological Survey Shows Potential Radon Hazards Throughout the StateK2 Radio · 2024-04-29
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 23 counties
| County | EPA zone |
|---|---|
| Albany County | Zone 1 |
| Big Horn County | Zone 1 |
| Campbell County | Zone 1 |
| Carbon County | Zone 1 |
| Converse County | Zone 1 |
| Crook County | Zone 1 |
| Fremont County | Zone 1 |
| Goshen County | Zone 1 |
| Hot Springs County | Zone 1 |
| Johnson County | Zone 1 |
| Laramie County | Zone 1 |
| Lincoln County | Zone 1 |
| Natrona County | Zone 1 |
| Niobrara County | Zone 1 |
| Park County | Zone 1 |
| Platte County | Zone 2 |
| Sheridan County | Zone 1 |
| Sublette County | Zone 1 |
| Sweetwater County | Zone 1 |
| Teton County | Zone 1 |
| Uinta County | Zone 1 |
| Washakie County | Zone 1 |
| Weston County | Zone 2 |
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).