EPA Zone Data 2026
OR Radon Levels
View EPA radon zone classifications for every county in OR. Select your county to see detailed risk data, testing recommendations, and mitigation cost estimates.
0
Zone 1
High Risk
High Risk
21
Zone 2
Moderate
Moderate
15
Zone 3
Low Risk
Low Risk
Baker
Zone 2
Benton
Zone 3
Clackamas
Zone 3
Clatsop
Zone 2
Columbia
Zone 2
Coos
Zone 3
Crook
Zone 2
Curry
Zone 3
Deschutes
Zone 3
Douglas
Zone 3
Gilliam
Zone 2
Grant
Zone 2
Harney
Zone 2
Hood River
Zone 2
Jackson
Zone 3
Jefferson
Zone 2
Josephine
Zone 3
Klamath
Zone 2
Lake
Zone 2
Lane
Zone 3
Lincoln
Zone 3
Linn
Zone 3
Malheur
Zone 2
Marion
Zone 3
Morrow
Zone 2
Multnomah
Zone 2
Polk
Zone 3
Sherman
Zone 2
Tillamook
Zone 3
Umatilla
Zone 2
Union
Zone 2
Wallowa
Zone 3
Wasco
Zone 2
Washington
Zone 2
Wheeler
Zone 2
Yamhill
Zone 2
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