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Discover the radon zones in Idaho with this map showing Bonner, Kootenai, Benewah, Shoshone, Latah, Clearwater, Nez Perce, Lewis, and more counties divided into three zones based on radon levels. Stay informed and ensure your indoor air quality is safe.
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Idaho Map of Radon Zones Boundary Bonner Legend Kootenai Zone 1 > 4 pCi/L Benewah Benewah Shoshone Zone 2 2 - 4 pCi/L Latah Latah Clearwater Clearwater Zone 3 < 2 pCi/L Nez Perce Lewis Idaho Lemhi Adams Valley Washington Custer Clark Fremont Payette Boise Gem Jefferson Madison Teton Butte Canyon Blaine Bonneville Ada Camas Elmore Bingham Gooding Lincoln Caribou Minidoka Power Jerome Bannock Owyhee Twin Falls Cassia Bear Lake Oneida Franklin Based on average radon test results reported since 1990 (Revised 8-14-08) Idaho Indoor Environment Program