Radon zones in Alaska
Last updated
EPA’s Map of Radon Zones places 30 Alaska boroughs and census areas in its three radon potential zones: 0 in Zone 1 (highest), 5 in Zone 2 (moderate), and 25 in Zone 3 (low).
What this means for Alaska homes
Most Alaska boroughs and census areas fall in Zone 3. EPA predicts lower average indoor levels (below 2 pCi/L) across much of Alaska. That does not mean your home is low: EPA notes that elevated levels are found in Zone 3 counties too.
EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.
Alaska radon program
EPA lists the following state contact for Alaska: AK Department of Environmental Conservation Division of Air Quality, phone 907-465-5100. Website: dggs.alaska.gov/hazards/radon.html. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.
Alaska boroughs and census areas and their EPA radon zones
| County | EPA radon zone |
|---|---|
| Aleutians East Borough | Zone 3 |
| Aleutians West Census Area | Zone 3 |
| Anchorage Municipality | Zone 3 |
| Bethel Census Area | Zone 3 |
| Bristol Bay Borough | Zone 3 |
| Chugach Census Area (zone of Valdez-Cordova Census Area) | Zone 3 |
| Copper River Census Area (zone of Valdez-Cordova Census Area) | Zone 3 |
| Denali Borough | Zone 3 |
| Dillingham Census Area | Zone 3 |
| Fairbanks North Star Borough | Zone 2 |
| Haines Borough | Zone 3 |
| Hoonah-Angoon Census Area (zone of Skagway Municipality) | Zone 3 |
| Juneau City and Borough | Zone 3 |
| Kenai Peninsula Borough | Zone 2 |
| Ketchikan Gateway Borough | Zone 2 |
| Kodiak Island Borough | Zone 3 |
| Kusilvak Census Area (zone of Wade Hampton Census Area) | Zone 3 |
| Lake and Peninsula Borough | Zone 3 |
| Matanuska-Susitna Borough | Zone 2 |
| Nome Census Area | Zone 3 |
| North Slope Borough | Zone 3 |
| Northwest Arctic Borough | Zone 3 |
| Petersburg Borough (zone of Wrangell-Petersburg Census Area) | Zone 3 |
| Prince of Wales-Hyder Census Area (zone of Prince of Wales-Outer Ketchikan Census Area) | Zone 3 |
| Sitka City and Borough | Zone 3 |
| Skagway Municipality | Zone 3 |
| Southeast Fairbanks Census Area | Zone 2 |
| Wrangell City and Borough (zone of Wrangell-Petersburg Census Area) | Zone 3 |
| Yakutat City and Borough | Zone 3 |
| Yukon-Koyukuk Census Area | Zone 3 |
County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.
Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.