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Radon zones in Alaska

The EPA assigns every county in Alaska to one of three radon potential zones. No county in Alaska is in Zone 1. That is a statement about predicted county averages, not about any individual home - homes above the action level are found in all three zones.

30
Counties
0
Zone 1 counties
Predicted average above 4 pCi/L
5
Zone 2 counties
Predicted average 2-4 pCi/L
25
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Alaska

Every county in Alaska, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 0Zone 2 · 5Zone 3 · 25

Hover a county · click to open it

County by county

All 30 Alaska counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Fairbanks North Star Borough295k4.9%13.8%30.2
Kenai Peninsula Borough261k7.3%16.1%27.5
Ketchikan Gateway Borough214k6.6%15.9%39.7
Matanuska-Susitna Borough2115k6.7%17.3%32.5
Southeast Fairbanks Census Area27,0777.5%18.3% -
Aleutians East Borough33,4615.0%17.0% -
Aleutians West Census Area35,1604.3%16.2% -
Anchorage Municipality3286k5.3%14.0%31.0
Bethel Census Area318k9.9%31.0%49.0
Bristol Bay Borough38447.1%16.5% -
Chugach Census Area36,7696.3%14.8% -
Copper River Census Area32,6748.0%17.8% -
Denali Borough31,5845.9%16.3% -
Dillingham Census Area34,6078.6%25.7% -
Haines Borough32,0707.2%13.8% -
Hoonah-Angoon Census Area32,2629.4%19.5% -
Juneau City and Borough332k5.9%13.9%24.5
Kodiak Island Borough313k5.5%15.0% -
Kusilvak Census Area38,00111.6%36.6% -
Lake and Peninsula Borough31,3319.1%24.7% -
Nome Census Area39,7638.7%28.7%58.6
North Slope Borough311k6.0%20.8%52.2
Northwest Arctic Borough37,3618.8%28.3% -
Petersburg Borough33,4276.8%14.9% -
Prince of Wales-Hyder Census Area35,6969.4%22.0% -
Sitka City and Borough38,2826.0%13.8%36.3
Skagway Municipality31,0956.3%15.4% -
Wrangell City and Borough32,0649.1%17.0% -
Yakutat City and Borough36878.6%20.5% -
Yukon-Koyukuk Census Area35,12910.5%27.4%54.6

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere