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State radon guide

Radon Testing, Mitigation Costs & Contractors in Montana

Montana DEQ encourages residents to test because geology and building conditions can produce elevated radon. A map or provider's office location cannot tell you a home's radon level or a contractor's service territory.

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Testing your home

Use a short- or long-term test according to its instructions. Montana DEQ notes that long-term testing can better represent year-round exposure.

Free or low-cost test-kit information

Montana DEQ distributes subsidized kits, and some county health departments offer discounted kits. A January 2026 promotion offered $5 kits while supplies lasted; do not show that promotional price without a fresh inventory check.

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.

Montana rules and public resources

Verified Limited: Montana DEQ explicitly says it does not certify or require proof of certification for contractors on its convenience lists. Listed individuals may hold NRPP/NRSB credentials, which homeowners should independently confirm.

EPA radon-zone context

Use EPA's Montana zone map as general radon-potential context. It does not determine whether an individual home has elevated radon.

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 Montana

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

Browse all Montana listings

Frequently asked questions

Should every home in Montana be tested for radon?

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

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 Montana?

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 Montana?

Montana DEQ distributes subsidized kits, and some county health departments offer discounted kits. A January 2026 promotion offered $5 kits while supplies lasted; do not show that promotional price without a fresh inventory check.

Sources

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