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State radon guide

Radon Testing, Mitigation Costs & Contractors in Connecticut

Connecticut DPH recommends testing homes throughout the state. Radon can also be relevant to private well water, but indoor-air testing is the starting point for understanding a home's radon level.

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Testing your home

Test the lowest occupied level and repeat testing after major structural changes or as recommended by the state. Nationally certified professionals are available for homeowners who prefer professional measurement. If indoor air is elevated and the home uses a private well, review Connecticut's radon-in-water guidance.

Free or low-cost test-kit information

Connecticut local health departments/districts may distribute free or discounted radon-in-air test devices, particularly through winter partnerships. Eligibility and supply vary locally.

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.

Connecticut rules and public resources

Verified Nuanced: Connecticut DPH says the state does not license or otherwise certify radon professionals, but maintains lists of nationally certified professionals. Residential mitigation contracting may also trigger Connecticut Department of Consumer Protection registration requirements; verify the applicable contractor registration separately.

EPA radon-zone context

Connecticut has broad radon potential. Regional maps and local statistics cannot determine an individual home's result.

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 Connecticut

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

Browse all Connecticut listings

Frequently asked questions

Should every home in Connecticut be tested for radon?

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

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 Connecticut?

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 Connecticut?

Connecticut local health departments/districts may distribute free or discounted radon-in-air test devices, particularly through winter partnerships. Eligibility and supply vary locally.

Sources

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