Home › Oregon
State overview
Radon in Oregon
Of Oregon's 36 counties and county equivalents, EPA places 21 in Zone 2, 15 in Zone 3. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
Oregon stories
- Oregon State University study links brain cancer risk to radon exposureKOIN.com · 2026-10-13
- What is radon? Here’s what Oregon officials warn about the radioactive gasKOIN.com · 2024-01-25
- Radon awareness poster contest comes back to OregonOregon Public Broadcasting - OPB · 2023-01-17
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 36 counties
| County | EPA zone |
|---|---|
| Baker County | Zone 2 |
| Benton County | Zone 3 |
| Clackamas County | Zone 3 |
| Clatsop County | Zone 2 |
| Columbia County | Zone 2 |
| Coos County | Zone 3 |
| Crook County | Zone 2 |
| Curry County | Zone 3 |
| Deschutes County | Zone 3 |
| Douglas County | Zone 3 |
| Gilliam County | Zone 2 |
| Grant County | Zone 2 |
| Harney County | Zone 2 |
| Hood River County | Zone 2 |
| Jackson County | Zone 3 |
| Jefferson County | Zone 2 |
| Josephine County | Zone 3 |
| Klamath County | Zone 2 |
| Lake County | Zone 2 |
| Lane County | Zone 3 |
| Lincoln County | Zone 3 |
| Linn County | Zone 3 |
| Malheur County | Zone 2 |
| Marion County | Zone 3 |
| Morrow County | Zone 2 |
| Multnomah County | Zone 2 |
| Polk County | Zone 3 |
| Sherman County | Zone 2 |
| Tillamook County | Zone 3 |
| Umatilla County | Zone 2 |
| Union County | Zone 2 |
| Wallowa County | Zone 3 |
| Wasco County | Zone 2 |
| Washington County | Zone 2 |
| Wheeler County | Zone 2 |
| Yamhill County | Zone 2 |
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).