Radon Levels in Hawaii
Hawaii is classified as an EPA Zone 3 state with a low risk for radon. Average indoor radon levels range from 0.2 to 0.6 pCi/L, and approximately 1% of Hawaii homes test above the EPA action level of 4.0 pCi/L.
Hawaii Radon Summary
Key Facts About Radon in Hawaii
- Hawaii has the lowest radon levels of any US state
- Volcanic basalt geology contains very little uranium
- Open-air construction style naturally ventilates buildings
- Radon is essentially a non-issue for most Hawaii residents
Hawaii Testing Requirements & Recommendations
Testing is generally not necessary in Hawaii, though the EPA still technically recommends it for all US homes.
Radon mitigation is extremely rare in Hawaii and typically not needed.
Major Cities in Hawaii
Radon levels can vary significantly within Hawaii depending on local geology. All residents — regardless of city — should test their specific home, as neighborhood-level radon varies independently of broader state and county averages.
What Should Hawaii Residents Do?
Test Your Home
Use a short-term charcoal test kit ($15–$25) for an initial reading, or a continuous radon detector for ongoing monitoring. Test in your basement or lowest livable area.
Understand Your Result
If your result is below 2.0 pCi/L: monitor periodically. Between 2.0–4.0 pCi/L: consider mitigation. Above 4.0 pCi/L: the EPA recommends mitigation. Above 8.0 pCi/L: take action promptly.
Hire a Certified Contractor if Needed
Look for NRPP or NRSB-certified radon mitigation contractors in Hawaii. Mitigation systems typically cost $800–$2,500 and can reduce radon levels by 50–99%.
Verify with a Follow-Up Test
After mitigation, test again to confirm the system is working. Retest every 2 years, or after significant home renovations.
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