Radon Risk in Hawaii
EPA zone data and CDC radon averages for all 5 counties in Hawaii.
Tipper on radon in Hawaii
The CDC doesn't have enough statewide testing data to calculate a reliable average for Hawaii. That doesn't mean radon isn't a concern here. It means individual county data, where available, is your best guide. Use the county list below to find the most specific data for where you live.
Looking at the zone breakdown: none of Hawaii's counties are in the high-risk Zone 1 category, and 5 are Zone 3 (low). Use the county list below to find your area and see the most specific data available.
Tipper's recommendation for Hawaii residents: if you haven't tested your home, start there. A short-term test kit costs around $15 and gives you a result in 48 hours. If your home tests at or above 4 pCi/L, a professional mitigation system (typically $800–$2,000 depending on your foundation and home size) will reliably bring levels down.
Sources: EPA Radon Zone Map
Why Hawaii's Geology Matters
Hawaii has the lowest radon risk in the nation. The volcanic basalt that forms the islands contains very little uranium compared to continental rock types. The porous nature of young volcanic rock and the trade wind ventilation further reduce indoor radon accumulation.
Radon Disclosure Laws
Hawaii does not have a radon-specific disclosure requirement, consistent with the state's minimal radon risk.
All Counties in Hawaii
Click any county to see its full radon data and local contractors.
Showing 5 of 5 counties in Hawaii. Zone classifications from the EPA. Average pCi/L from CDC tracking data.
Not sure where to start?
A short-term test kit tells you your home's actual radon level in 48 hours. Tipper has picked the best options at every price point. All EPA-approved, all lab-fee included.
Contractors
Find certified radon pros in Hawaii →