Radon Levels in Oregon

36 counties — 0 high risk, 21 moderate, 15 low risk

21
15
Zone 1 High (0.0%) Zone 2 Moderate (58.3%) Zone 3 Low (41.7%)

Oregon Radon Zone Map

Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.

Check Your Oregon ZIP Code

All 36 Counties — By Radon Risk

CountyEPA ZoneTests% Above 4 pCi/L
Baker Moderate 4 —
Clatsop Moderate 7 —
Columbia Moderate 9 55.6%
Crook Moderate 6 —
Gilliam Moderate — —
Grant Moderate — —
Harney Moderate — —
Hood River Moderate 4 —
Jefferson Moderate 4 —
Klamath Moderate 12 66.7%
Lake Moderate — —
Malheur Moderate 4 —
Morrow Moderate — —
Multnomah Moderate 120 31.7%
Sherman Moderate — —
Umatilla Moderate 10 40%
Union Moderate 5 —
Wasco Moderate 6 —
Washington Moderate 76 31.6%
Wheeler Moderate — —
Yamhill Moderate 17 29.4%
Benton Low 12 41.7%
Clackamas Low 74 36.5%
Coos Low 18 33.3%
Curry Low 6 —
Deschutes Low 33 42.4%
Douglas Low 29 51.7%
Jackson Low 41 46.3%
Josephine Low 18 61.1%
Lane Low 66 33.3%
Lincoln Low 15 26.7%
Linn Low 22 36.4%
Marion Low 53 43.4%
Polk Low 15 33.3%
Tillamook Low 5 —
Wallowa Low — —

Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network

Frequently Asked Questions

How many counties in Oregon have high radon risk?

Oregon has 0 counties classified as EPA Zone 1 (high radon risk), 21 as Zone 2 (moderate), and 15 as Zone 3 (low risk).

Is radon a problem in Oregon?

The EPA recommends all homes in Oregon be tested for radon, regardless of which zone they're in.

How do I check radon levels for my Oregon address?

Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.