Mililani, HI Radon Mitigation and Testing

Q: What EPA Radon Zone is Mililani in?

Mililani is in Honolulu County, EPA Zone 3.

Q: How much does radon mitigation cost in Mililani?

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

This planned community in Honolulu County on Oahu's central plateau sits in EPA zone 3, where volcanic geology typically results in lower radon levels. Mililani's predominantly single-family homes built since the 1960s feature concrete slab foundations without basements, which generally reduce radon accumulation potential. While testing data for zip code 96789 is limited, the area's volcanic substrate and slab-on-grade construction typically produce minimal radon concerns.

Mililani, HI Radon Mitigation

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

Mililani, HI Radon Testing

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

Mililani Radon Facts

Key details about the radon risk profile for Mililani and the 96789 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Honolulu County, HI

Zip Code

96789

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Mililani and the 96789 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 Mililani, HI

What EPA Radon Zone is Mililani in?

Mililani and the 96789 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 Mililani?

Radon mitigation in Mililani 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 Mililani?

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