Radon Mitigation Cost in Montana

Montana ranks #4 in the U.S. for radon risk. 88% of Montana counties are classified by the EPA as Zone 1 — the highest-risk category, with predicted average indoor radon levels above the EPA action level of 4 pCi/L. Here's what that means for mitigation cost.

Montana radon risk profile

Montana has 50 of 57 counties (88%) in EPA Zone 1. The state's geology — dominated by granite, shale, and glacial deposits — produces some of the highest natural uranium concentrations in the U.S., translating to elevated indoor radon throughout most of the state.

Typical mitigation cost

National typical range: $1,200-$2,500 installed for a standard active sub-slab depressurization (ASD) system in a single-family home. Multi-level or multi-zone homes can reach $3,000-$5,000. These figures are from aggregated contractor pricing surveys and are not specific to Montana.

We do not publish a Montana-specific average cost figure because no reliable state-level cost survey is publicly available. Get 2-3 quotes from EPA-listed certified mitigators in your county for accurate Montana pricing.

Montana-specific factors

Montana's cold winters mean homes are sealed tightly for energy efficiency, which traps radon at higher concentrations. Long heating seasons compound exposure. Mitigation is well-established statewide.

How to find a certified mitigator in Montana

The two main certifying bodies for radon mitigation are the National Radon Proficiency Program (NRPP) and the National Radon Safety Board (NRSB). Both maintain public contractor directories searchable by ZIP code. If you live in a state with a radon program (which Montana does), the state health department typically maintains a certified-contractor list as well — usually on the department's environmental health page.

Always retest after mitigation. A properly designed system should reduce levels to under 2 pCi/L; verify the result rather than trusting the contractor's word.

Try the calculator

Radon Mitigation Cost Estimator

Get an installed-cost range for a standard ASD system based on home size and foundation type.

Home Inspection Cost Estimator

Pre-purchase home inspection cost — radon testing is often a bundled add-on.

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