- Under 10%
- 10–20%
- 20–30%
- 30–40%
- 40% or more
- No data
Counties
| County | Tests | % ≥ 4 pCi/L | Median (pCi/L) | EPA zone (1993) | Source |
|---|---|---|---|---|---|
| Aleutians East Borough | — | — | — | Zone 3 | — |
| Aleutians West CA | — | — | — | Zone 3 | — |
| Anchorage Muny | 428 | 7% | 1.1 | Zone 2 | Radon test results from laboratories through 2017 |
| Bethel CA | — | — | — | Zone 3 | — |
| Bristol Bay Borough | — | — | — | Zone 3 | — |
| Denali Borough | — | — | — | Zone 3 | — |
| Dillingham CA | — | — | — | Zone 3 | — |
| Fairbanks North Star Borough | 241 | 34% | 2.2 | Zone 2 | Radon test results from laboratories through 2017 |
| Haines Borough | — | — | — | Zone 3 | — |
| Hoonah-Angoon CA | — | — | — | Zone 3 | — |
| Juneau Cty&Bor | 6 | 0% | 0.1 | Zone 3 | Radon test results from laboratories through 2017 |
| Kenai Peninsula Borough | 32 | 25% | 2.1 | Zone 2 | Radon test results from laboratories through 2017 |
| Ketchikan Gateway Borough | — | — | — | Zone 3 | — |
| Kodiak Island Borough | 6 | 50% | 2.8 | Zone 3 | Radon test results from laboratories through 2017 |
| Lake and Peninsula Borough | — | — | — | Zone 3 | — |
| Matanuska-Susitna Borough | 103 | 23% | 1.7 | Zone 2 | Radon test results from laboratories through 2017 |
| Nome CA | — | — | — | Zone 3 | — |
| North Slope Borough | — | — | — | Zone 3 | — |
| Northwest Arctic Borough | — | — | — | Zone 3 | — |
| Petersburg CA | — | — | — | Zone 3 | — |
| Prince of Wales-Hyder CA | — | — | — | Zone 3 | — |
| Sitka Cty&Bor | 1 | 0% | 0.1 | Zone 3 | Radon test results from laboratories through 2017 |
| Skagway Muny | — | — | — | Zone 3 | — |
| Southeast Fairbanks CA | 10 | 40% | 2.9 | Zone 2 | Radon test results from laboratories through 2017 |
| Valdez-Cordova CA | 3 | 0% | 0.8 | Zone 3 | Radon test results from laboratories through 2017 |
| Wade Hampton CA | — | — | — | Zone 3 | — |
| Wrangell Cty&Bor | — | — | — | Zone 3 | — |
| Yakutat Cty&Bor | — | — | — | Zone 3 | — |
| Yukon-Koyukuk CA | — | — | — | Zone 3 | — |
Test your home
County figures show how often tests come back high, not the level in your home. Only a test tells you that: see how to test for radon.
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