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State radon guide

Radon Testing, Mitigation Costs & Contractors in New Jersey

New Jersey DEP regulates radon testing and mitigation businesses and professionals and maintains municipality-level radon-potential information. Even a low-potential municipality can contain a home with elevated radon.

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Testing your home

Homeowners can use a properly certified retail test kit or hire a New Jersey-certified radon measurement business. DEP says retail kits should carry the New Jersey certification number.

Free or low-cost test-kit information

New Jersey DEP advises residents to check municipal or county health departments for free radon test kits; kits can also be purchased from hardware stores or NJ-certified businesses. Local supply varies.

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 Jersey rules and public resources

Verified: New Jersey law requires businesses and professionals conducting radon testing and mitigation to be certified by NJDEP. Verify current certification before displaying it on a contractor profile.

EPA radon-zone context

New Jersey uses municipal radon-potential tiers. DEP still recommends testing all homes because levels can vary widely even within the same area.

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 Jersey

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 Jersey listings

Frequently asked questions

Should every home in New Jersey be tested for radon?

Testing is the only way to know the radon level in a specific New Jersey 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 Jersey?

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 Jersey?

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.

Are free or low-cost radon test kits available in New Jersey?

New Jersey DEP advises residents to check municipal or county health departments for free radon test kits; kits can also be purchased from hardware stores or NJ-certified businesses. Local supply varies.

Sources

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