Radon Mitigation Cost in Idaho (2026)
Radon in Idaho
Idaho's geology creates high radon risk across much of the state. The Rocky Mountain batholith — the same granite mass underlying Montana, Wyoming, and Colorado — runs through central and northern Idaho, producing significant uranium and radon.
High-risk areas:
- Northern Idaho (Coeur d'Alene, Sandpoint, Moscow, Lewiston): Zone 1, frequent readings above 10 pCi/L
- Central mountains (Salmon, Challis, Stanley area): Zone 1 granite terrain
- Boise foothills: Zone 1–2, elevated in areas near granite outcrops
- Snake River Plain (Twin Falls, Pocatello, Idaho Falls): Zone 2, volcanic basalt but still elevated in pockets
Cost by Foundation Type
Basement: $950–$2,000
Idaho's cold winters make basements common, particularly in northern Idaho and the mountain communities.
- Unfinished basement: $950–$1,500
- Finished basement: $1,400–$2,000
Slab-on-Grade: $900–$1,800
Most common in the Boise metro and newer Snake River Plain construction.
Crawl Space: $2,500–$5,500
Older Idaho homes, particularly in Coeur d'Alene, Moscow, and the mountain towns, often have crawl spaces over rocky soil.
Idaho-Specific Factors
Boise growth: The Boise metro has exploded in growth, bringing more contractor options and competitive pricing. Northern Idaho remains underserved — expect longer waits.
Mining legacy: Some north Idaho communities have historic silver and lead mining — if your home is near a historic mine site, ask your contractor about potential additional radon sources.
Rural contractor shortage: Outside Boise and Coeur d'Alene, certified contractors are scarce. Plan ahead and expect travel fees.
Idaho Resources
- ID Dept of Health & Welfare: healthandwelfare.idaho.gov (search "radon")
- Verify NRPP: radonproficiency.org
- Verify NRSB: nrsb.org
Frequently Asked Questions
How bad is radon in Idaho?
Idaho has significant radon risk statewide. Northern Idaho (Coeur d'Alene, Moscow, Sandpoint) and the central mountains have EPA Zone 1 designation. Southern Idaho and the Snake River Plain are Zone 2. Over 30% of Idaho homes tested exceed the EPA action level.
How much does radon mitigation cost in Idaho?
Expect $950–$2,000 for slab or basement systems. Boise has competitive pricing; rural north Idaho may cost more due to contractor availability.
Does Idaho require radon contractor licensing?
Idaho does not have a state radon contractor licensing program. Verify NRPP or NRSB national certification.
Find a Certified Mitigator in Idaho
Browse NRPP and NRSB certified radon mitigators in Idaho, verified against official certification databases.
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