EPA Zone Data 2026
Oregon Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Oregon. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
0
Zone 1
High Risk
High Risk
21
Zone 2
Moderate
Moderate
15
Zone 3
Low Risk
Low Risk
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Browse Counties
Jump to the Directory
Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Baker County
Zone 2
Clatsop County
Zone 2
Columbia County
Zone 2
Crook County
Zone 2
Gilliam County
Zone 2
Grant County
Zone 2
Harney County
Zone 2
Hood River County
Zone 2
Jefferson County
Zone 2
Klamath County
Zone 2
Lake County
Zone 2
Malheur County
Zone 2
Morrow County
Zone 2
Multnomah County
Zone 2
Sherman County
Zone 2
Umatilla County
Zone 2
Union County
Zone 2
Wasco County
Zone 2
Washington County
Zone 2
Wheeler County
Zone 2
Yamhill County
Zone 2
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