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State overview
Radon in Hawaii
Of Hawaii's 5 counties and county equivalents, EPA places 5 in Zone 3. Zones are county-wide predictions; testing is the only way to know your home's level.
All 5 counties
| County | EPA zone |
|---|---|
| Hawaii County | Zone 3 |
| Honolulu County | Zone 3 |
| Kalawao County | Zone 3 |
| Kauai County | Zone 3 |
| Maui County | Zone 3 |
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).