Radon Mitigation Cost in Maine

Maine ranks #7 in the U.S. for radon risk. 75% of Maine 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.

Maine radon risk profile

Maine has 12 of 16 counties (75%) classified as EPA Zone 1. The state's granite-heavy bedrock — the same geology that makes Maine's coastline famous — produces high uranium decay and elevated indoor radon levels. Maine also has high radon levels in well water in many areas, requiring water-side mitigation in addition to air-side systems.

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 Maine.

We do not publish a Maine-specific average cost figure because no reliable state-level cost survey is publicly available.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 Maine pricing.

Maine-specific factors

Maine's older housing stock (a higher percentage of pre-1950 homes than the national average) often requires more complex mitigation due to fieldstone foundations and cold-climate sealing. Mitigation costs in Maine can run higher than the national average due to limited contractor density in rural counties.

How to find a certified mitigator in Maine

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 Maine 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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