2026-02-11 · 3 min read
Radon Mitigation Cost in Hawaii (2026)
Hawaii has low radon risk overall — volcanic basalt geology produces very little radon. Most homes test well below the action level, but testing is still worthwhile.
Radon in Hawaii: The Lowest-Risk State
Hawaii is the only state in EPA Radon Zone 3 across its entire land area — and even within Zone 3, Hawaii sits at the very low end of the risk spectrum. Volcanic basalt, the dominant rock type across all the main islands, contains virtually no uranium. Without uranium, there's no radium decay chain, and no radon production.
Average indoor radon levels in Hawaii homes are below 0.5 pCi/L — the lowest in the US and well below the EPA action level of 4.0 pCi/L.
When Hawaii Homes Do Test High
It happens rarely, but some Hawaii homes do test above 4.0 pCi/L. Possible explanations:
- Imported fill material: Some construction uses fill soil from elsewhere that may contain more uranium than native basalt
- Building materials: Certain concrete blocks or aggregate materials can off-gas radon
- Measurement error: Ensure any test is conducted per EPA protocol (closed windows 12+ hours before and during test)
If You Need Mitigation
The same sub-slab depressurization systems used on the mainland work in Hawaii. However:
Expect higher costs: Hawaii's island economy means materials and labor are more expensive. A job that costs $1,200 on the mainland may run $1,800–$3,000 in Hawaii. Oahu has the most contractor options; neighbor islands have very few.
Certified contractors are scarce: Hawaii has a small pool of certified radon contractors. Finding an NRPP or NRSB certified contractor may require contacting the Hawaii Dept of Health for referrals.
Hawaii Resources
- Hawaii Dept of Health: health.hawaii.gov (search "radon")
- Verify NRPP: radonproficiency.org
- Verify NRSB: nrsb.org
Frequently Asked Questions
Does Hawaii have a radon problem?
Hawaii has the lowest radon levels in the US. Volcanic basalt geology contains almost no uranium, producing very little radon. Most Hawaii homes test below 1.0 pCi/L. The EPA action level of 4.0 pCi/L is rarely reached.
Should I still test my Hawaii home for radon?
Testing is never a bad idea, but Hawaii is the lowest-risk state in the country. If you're buying a home or have specific concerns, a short-term test is inexpensive and provides certainty.
How much does radon mitigation cost in Hawaii?
The rare Hawaii home that tests above 4.0 pCi/L will pay $1,500–$3,500 for mitigation — Hawaii's labor costs are among the highest in the country due to the cost of doing business on island.
Find a Certified Mitigator Near You
Every contractor on RadonBase is NRPP or NRSB certified — mitigators only, no testers.
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