Hawaii (HI) - Radon Levels & Risk Assessment

Hawaii is classified as EPA Zone 3 (Lowest Potential) for radon potential, with an average indoor radon level of 0.5 pCi/L. This is well below the EPA action level of 4.0 pCi/L, but elevated radon levels can still be found in individual homes. Approximately 1% of homes in Hawaii have radon levels above 4.0 pCi/L.

Radon Data for Hawaii

Radon Risk in Hawaii

As an EPA Zone 3 (Lowest Potential) state, Hawaii has lower overall radon potential compared to northern and mountain states. However, radon levels vary significantly by county and even by neighborhood, so testing is still important. The average indoor radon level of 0.5 pCi/L is below the EPA concern threshold, though individual homes can vary significantly.

Testing and Mitigation in Hawaii

Hawaii does not currently require radon testing, but health officials still recommend testing all homes. The average cost of radon mitigation in Hawaii is $1,800, which is above the national average. Professional radon testers and mitigators in Hawaii can be found through the NRPP (National Radon Proficiency Program) or the NRSB (National Radon Safety Board) directories.

Protecting Your Home in Hawaii

The EPA recommends that all homes in Hawaii be tested for radon, regardless of the state's overall zone classification. If your home tests at 4.0 pCi/L or above, install a mitigation system. If your home tests between 2.0 and 4.0 pCi/L, the EPA suggests considering mitigation. New construction in Hawaii may benefit from radon-resistant building techniques (RRNC), which are inexpensive to include during construction and can be easily activated later if radon levels are found to be elevated.

Use our radon risk assessment tool for a personalized estimate based on your home's characteristics, or browse all states to compare radon data across the country.