Radon Compass

Radon in Alaska

About 1 in 6 homes tested in Alaska were at or above the EPA action level of 4 pCi/L.

680 homes tested, 2008–2017
  • Below 2 pCi/L: 65%
  • 2 to 4 pCi/L: 17%
  • 4 pCi/L or more: 17%
The line marks the EPA action level, 4 pCi/L.

The EPA puts 0 of Alaska's 30 counties in Zone 1, its highest radon category, 5 in Zone 2 and 25 in Zone 3.

Every county in Alaska

Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.

CountyHomes testedAt or above 4MedianEPA zone
Kodiak Island Borough5 tests––3
Southeast Fairbanks Census Area3 tests––2
Fairbanks North Star Borough
34%2.2 pCi/L2
Kenai Peninsula Borough
25%2.1 pCi/L2
Matanuska-Susitna Borough
23%1.7 pCi/L2
Anchorage Municipality
7%1.1 pCi/L3
Juneau City and Borough6 tests––3
Sitka City and Borough1 tests––3
Aleutians East BoroughNo data––3
Aleutians West Census AreaNo data––3
Bethel Census AreaNo data––3
Bristol Bay BoroughNo data––3
Chugach Census AreaNo data––3
Copper River Census AreaNo data––3
Denali BoroughNo data––3
Dillingham Census AreaNo data––3
Haines BoroughNo data––3
Hoonah-Angoon Census AreaNo data––3
Ketchikan Gateway BoroughNo data––2
Kusilvak Census AreaNo data––3
Lake and Peninsula BoroughNo data––3
Nome Census AreaNo data––3
North Slope BoroughNo data––3
Northwest Arctic BoroughNo data––3
Petersburg BoroughNo data––3
Prince of Wales-Hyder Census AreaNo data––3
Skagway MunicipalityNo data––3
Wrangell City and BoroughNo data––3
Yakutat City and BoroughNo data––3
Yukon-Koyukuk Census AreaNo data––3

"–" means fewer than 20 tests or no lab data, too few for a reliable figure.

Sources

Last updated October 2026. How we calculate these numbers.