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Counties with the Highest Radon Potential in Alaska

The top 22 of 22 Alaska counties on GIS Map, ranked by EPA radon zone, where zone 1 carries the highest predicted indoor radon potential and zone 3 the lowest.

#CountyEPA radon zone
1Aleutians East Borough
3
2Aleutians West Census Area
3
3Anchorage Municipality
3
4Bethel Census Area
3
5Bristol Bay Borough
3
6Denali Borough
3
7Dillingham Census Area
3
8Haines Borough
3
9Juneau City and Borough
3
10Kodiak Island Borough
3
11Lake and Peninsula Borough
3
12Nome Census Area
3
13North Slope Borough
3
14Northwest Arctic Borough
3
15Sitka City and Borough
3
16Yakutat City and Borough
3
17Yukon-Koyukuk Census Area
3
18Fairbanks North Star Borough
2
19Kenai Peninsula Borough
2
20Ketchikan Gateway Borough
2
21Matanuska-Susitna Borough
2
22Southeast Fairbanks Census Area
2

Source: EPA Map of Radon Zones (September 2025). All counties with data are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Counties with the Highest Radon Potential in Alaska”, https://gismap.land/rankings/alaska/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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