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State radon guide

Radon Testing, Mitigation Costs & Contractors in New Hampshire

New Hampshire homeowners should test indoor air for radon and consider private-well testing where appropriate. State materials emphasize that testing the property is more informative than relying on neighborhood assumptions.

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Testing your home

Use a properly placed short- or long-term test and follow the test instructions. For professional work, New Hampshire recommends nationally certified radon professionals.

Free or low-cost test-kit information

needs verification — an older official New Hampshire factsheet advertised free radon kits, but current statewide inventory/ordering was not confirmed for this handoff. Do not show a free-kit promise until rechecked.

Programs and inventory can change. Confirm current availability with the listed agency before relying on an offer.

Mitigation cost planning

Estimate only: a professionally installed residential radon mitigation system often falls in a broad $1,200–$3,500 range, but the final price can be lower or higher. Foundation type, crawlspaces, finished basements, multiple suction points, fan/pipe routing, electrical work, permits, diagnostics, and post-mitigation testing can materially change the quote. Use local written bids rather than treating this range as guaranteed pricing.

A test result provides important context, but it does not directly increase the modeled price.

New Hampshire rules and public resources

Verified With Freshness Warning: Official New Hampshire materials state that the state does not license or endorse radon mitigation professionals and recommends nationally certified professionals. Because the primary reviewed factsheet is older, re-confirm before launch.

EPA radon-zone context

New Hampshire has radon potential that varies by location and building. EPA maps are planning tools only; test the home.

Testing is the only way to know. EPA radon zones are broad planning tools. Never use a zone, county, ZIP, or map to predict the radon level of a specific home or to decide that testing is unnecessary.

Public radon professional listings in New Hampshire

Directory inclusion is not an endorsement or a guarantee. Confirm current services, credentials, insurance where appropriate, pricing, service area, and availability directly.

Browse all New Hampshire listings

Frequently asked questions

Should every home in New Hampshire be tested for radon?

Testing is the only way to know the radon level in a specific New Hampshire home. Maps, county averages, a neighbor's result, and foundation type cannot replace a properly conducted test.

What does a result of 4 pCi/L mean?

EPA recommends taking action to reduce radon at 4 pCi/L or higher and suggests considering action between 2 and 4 pCi/L. The action level is not a line between safe and unsafe; long-term risk generally increases as exposure increases.

How much does radon mitigation cost in New Hampshire?

Pricing varies by the home and the system design. RadonCostGuide uses broad planning estimates only; foundation type, crawlspaces, finished areas, suction points, electrical work, permits, diagnostics, and post-mitigation testing can all affect the final quote.

How do I find a radon professional in New Hampshire?

Start with the state radon program and the NRPP/NRSB directories where appropriate. Independently confirm current credentials, insurance, scope of work, permits, warranties, service area, and pricing before hiring.

Does New Hampshire offer free radon test kits?

needs verification — an older official New Hampshire factsheet advertised free radon kits, but current statewide inventory/ordering was not confirmed for this handoff. Do not show a free-kit promise until rechecked.

Sources

Content reviewed 2026-08-22. Costs are planning estimates, not quotes or guarantees.