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State radon guide

Radon Testing, Mitigation Costs & Contractors in Colorado

Colorado has substantial radon potential, and CDPHE reports elevated indoor radon in many parts of the state. Home-specific testing is still necessary because levels can vary from one building to the next.

Estimate mitigation costFind radon professionals

Testing your home

Test the lowest regularly occupied level using the kit or device instructions. If a result is elevated, confirm the result as appropriate and discuss mitigation with a qualified professional.

Free or low-cost test-kit information

CDPHE advertised one free radon test kit per Colorado household while supplies last, with discounted options when free inventory is unavailable. Check current availability before rendering this offer.

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.

Colorado rules and public resources

Needs Verification: needs verification — reviewed CDPHE consumer sources did not establish a statewide radon-specific professional license. Do not convert national certification observations or contractor licenses into a radon-license claim.

EPA radon-zone context

CDPHE notes that many Colorado counties have average indoor radon levels above EPA's 4 pCi/L action level. County averages and EPA zones are not substitutes for testing a 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 Colorado

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

Browse all Colorado listings

Frequently asked questions

Should every home in Colorado be tested for radon?

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

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 Colorado?

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 Colorado?

CDPHE advertised one free radon test kit per Colorado household while supplies last, with discounted options when free inventory is unavailable. Check current availability before rendering this offer.

Sources

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