Radon levels in Oregon: Low
The model predicts a population-weighted basement average of 1.7 pCi/L across Oregon's 36 counties - close to the US average of 1.8 pCi/L. Above-ground floors average 0.9 pCi/L.
Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.
0 / 36
EPA Zone 1 counties (0%)
21 / 15
Zone 2 / Zone 3 counties
0
counties predicted ≥ 4 pCi/L
0%
of ZIP codes predicted ≥ 4 pCi/L
Oregon counties by predicted radon
Sorted highest to lowest predicted basement average. 36 counties.
| County | Predicted basement | Upstairs | Grade | EPA zone | ZIPs |
|---|---|---|---|---|---|
| Union County | 2.5 pCi/L | 1.0 | Moderate | EPA Zone 2 | 7 |
| Baker County | 2.3 pCi/L | 1.3 | Moderate | EPA Zone 2 | 8 |
| Wallowa County | 2.3 pCi/L | 1.3 | Moderate | EPA Zone 3 | 5 |
| Malheur County | 2.3 pCi/L | 1.3 | Moderate | EPA Zone 2 | 11 |
| Wheeler County | 2.2 pCi/L | 1.2 | Moderate | EPA Zone 2 | 3 |
| Grant County | 2.1 pCi/L | 1.2 | Moderate | EPA Zone 2 | 10 |
| Lake County | 2.0 pCi/L | 1.2 | Moderate | EPA Zone 2 | 7 |
| Gilliam County | 2.0 pCi/L | 1.1 | Moderate | EPA Zone 2 | 2 |
| Multnomah County | 2.0 pCi/L | 1.0 | Moderate | EPA Zone 2 | 31 |
| Klamath County | 2.0 pCi/L | 0.8 | Low | EPA Zone 2 | 13 |
| Harney County | 1.9 pCi/L | 1.0 | Low | EPA Zone 2 | 6 |
| Crook County | 1.9 pCi/L | 0.9 | Low | EPA Zone 2 | 3 |
| Sherman County | 1.9 pCi/L | 1.1 | Low | EPA Zone 2 | 5 |
| Jefferson County | 1.9 pCi/L | 0.9 | Low | EPA Zone 2 | 4 |
| Umatilla County | 1.8 pCi/L | 1.1 | Low | EPA Zone 2 | 11 |
| Marion County | 1.8 pCi/L | 1.1 | Low | EPA Zone 3 | 23 |
| Yamhill County | 1.8 pCi/L | 1.0 | Low | EPA Zone 2 | 11 |
| Jackson County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 15 |
| Morrow County | 1.7 pCi/L | 0.9 | Low | EPA Zone 2 | 5 |
| Linn County | 1.7 pCi/L | 1.0 | Low | EPA Zone 3 | 15 |
| Deschutes County | 1.7 pCi/L | 0.6 | Low | EPA Zone 3 | 7 |
| Hood River County | 1.7 pCi/L | 1.0 | Low | EPA Zone 2 | 3 |
| Benton County | 1.7 pCi/L | 1.1 | Low | EPA Zone 3 | 5 |
| Polk County | 1.7 pCi/L | 1.1 | Low | EPA Zone 3 | 6 |
| Wasco County | 1.7 pCi/L | 1.0 | Low | EPA Zone 2 | 8 |
| Columbia County | 1.6 pCi/L | 1.1 | Low | EPA Zone 2 | 8 |
| Josephine County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 10 |
| Clatsop County | 1.6 pCi/L | 1.0 | Low | EPA Zone 2 | 7 |
| Lane County | 1.6 pCi/L | 0.9 | Low | EPA Zone 3 | 35 |
| Clackamas County | 1.6 pCi/L | 0.9 | Low | EPA Zone 3 | 24 |
| Curry County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| Coos County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 8 |
| Lincoln County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 15 |
| Tillamook County | 1.5 pCi/L | 0.9 | Low | EPA Zone 3 | 11 |
| Washington County | 1.4 pCi/L | 0.8 | Low | EPA Zone 2 | 21 |
| Douglas County | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 24 |
Oregon radon questions
- Is radon high in Oregon?
- Oregon's population-weighted predicted basement average is 1.7 pCi/L, close to the US average of 1.8. 0 of its 36 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 9 are in the 2-4 "consider fixing" range and 27 are below 2. 0% of Oregon ZIP codes are predicted at 4 or higher.
- Which Oregon county has the highest radon?
- Union County has the highest predicted basement average in Oregon at 2.5 pCi/L (EPA Zone 2). The lowest is Douglas County at 1.4 pCi/L. These are modeled area averages; individual homes in any county can test far higher.
- How many EPA Zone 1 counties are in Oregon?
- 0 of Oregon's 36 counties (0%) are EPA Zone 1 (highest potential), 21 are Zone 2 and 15 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
- Should I test for radon in Oregon?
- Yes. Even though Oregon's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 22.9% of Oregon ZIP codes are still predicted at 2 pCi/L or higher.
Oregon radon program
Many states offer free or discounted test kits and keep lists of certified mitigators. Find the Oregon radon office through the EPA state radon contacts page. Then read how to test and what mitigation costs.