EPA Zone Data 2026
Idaho Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Idaho. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
19
Zone 1
High Risk
High Risk
20
Zone 2
Moderate
Moderate
5
Zone 3
Low Risk
Low Risk
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Browse Counties
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Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Ada County
Zone 2
Bannock County
Zone 2
Bear Lake County
Zone 2
Benewah County
Zone 1
Bingham County
Zone 2
Blaine County
Zone 1
Boise County
Zone 1
Bonner County
Zone 1
Bonneville County
Zone 2
Boundary County
Zone 1
Butte County
Zone 1
Camas County
Zone 1
Canyon County
Zone 2
Caribou County
Zone 2
Cassia County
Zone 2
Clark County
Zone 1
Clearwater County
Zone 1
Custer County
Zone 1
Elmore County
Zone 1
Franklin County
Zone 2
Fremont County
Zone 1
Gooding County
Zone 1
Idaho County
Zone 1
Jefferson County
Zone 2
Jerome County
Zone 2
Kootenai County
Zone 1
Latah County
Zone 1
Lemhi County
Zone 1
Lincoln County
Zone 2
Madison County
Zone 2
Minidoka County
Zone 2
Oneida County
Zone 2
Owyhee County
Zone 2
Payette County
Zone 2
Power County
Zone 2
Shoshone County
Zone 1
Teton County
Zone 2
Twin Falls County
Zone 2
Valley County
Zone 1
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