Honolulu, HI Radon Mitigation and Testing

Q: What EPA Radon Zone is Honolulu in?

Honolulu is in Honolulu County, EPA Zone 3.

Q: How much does radon mitigation cost in Honolulu?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Honolulu County

EPA Zone 3

As Hawaii's largest city in Honolulu County, Honolulu spans multiple zip codes across Oahu's volcanic landscape, built primarily on coral reef limestone and basaltic bedrock. While comprehensive radon testing data is limited across the metro area, the island's volcanic geology generally produces lower radon concentrations than mainland locations. Nevertheless, residents in high-rise condominiums and single-family homes should consider testing, particularly in units with enclosed parking garages or basement-level spaces.

Honolulu, HI Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Honolulu, HI Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Honolulu Radon Facts

Key details about the radon risk profile for Honolulu and the 96813 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Honolulu County, HI

Zip Code

96813

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Honolulu and the 96813 zip code are located in Honolulu County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Honolulu, HI

What EPA Radon Zone is Honolulu in?

Honolulu and the 96813 zip code are in Honolulu County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Honolulu?

Radon mitigation in Honolulu typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Honolulu?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in Hawaii

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Honolulu	No submissions	0