Alaska Radon Levels
0Zone 1 (High)
5Zone 2 (Moderate)
22Zone 3 (Low)
No counties in Alaska are classified as Zone 1 (highest risk), but 5 counties are Zone 2 (moderate potential). The EPA recommends testing all homes regardless of zone classification, as elevated radon can occur in any zone.
| County | EPA Zone | Risk Level |
|---|---|---|
| Aleutians East Borough | Zone 3 | Lowest Potential |
| Aleutians West Census Area | Zone 3 | Lowest Potential |
| Anchorage Municipality | Zone 3 | Lowest Potential |
| Bethel Census Area | Zone 3 | Lowest Potential |
| Bristol Bay Borough | Zone 3 | Lowest Potential |
| Denali Borough | Zone 3 | Lowest Potential |
| Dillingham Census Area | Zone 3 | Lowest Potential |
| Fairbanks North Star Borough | Zone 2 | Moderate Potential |
| Haines Borough | Zone 3 | Lowest Potential |
| Juneau City and Borough | Zone 3 | Lowest Potential |
| Kenai Peninsula Borough | Zone 2 | Moderate Potential |
| Ketchikan Gateway Borough | Zone 2 | Moderate Potential |
| Kodiak Island Borough | Zone 3 | Lowest Potential |
| Lake and Peninsula Borough | Zone 3 | Lowest Potential |
| Matanuska-Susitna Borough | Zone 2 | Moderate Potential |
| Nome Census Area | Zone 3 | Lowest Potential |
| North Slope Borough | Zone 3 | Lowest Potential |
| Northwest Arctic Borough | Zone 3 | Lowest Potential |
| Prince of Wales-Outer Ketchikan Census Area | Zone 3 | Lowest Potential |
| Sitka City and Borough | Zone 3 | Lowest Potential |
| Skagway Municipality | Zone 3 | Lowest Potential |
| Southeast Fairbanks Census Area | Zone 2 | Moderate Potential |
| Valdez-Cordova Census Area | Zone 3 | Lowest Potential |
| Wade Hampton Census Area | Zone 3 | Lowest Potential |
| Wrangell-Petersburg Census Area | Zone 3 | Lowest Potential |
| Yakutat City and Borough | Zone 3 | Lowest Potential |
| Yukon-Koyukuk Census Area | Zone 3 | Lowest Potential |