Honolulu, HI Radon Levels

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.

Check local Honolulu radon levels and find certified testing and mitigation professionals to keep your home safe

Honolulu, HI Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Honolulu County, HI

Zip Code 96813

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.

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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 in Hawaii with the most user-submitted radon test data, ranked by number of submissions.

City	Avg User Radon Level	Submissions
Honolulu	No submissions	0