2026-01-14 · 5 min read
Radon Mitigation Cost in Oregon (2026)
Oregon has pockets of very high radon risk — especially in the southern and eastern counties. Mitigation runs $1,000–$2,500 for most homes.
Radon in Oregon
Oregon's radon risk is highly geographic. The Oregon Health Authority maps show:
- Southern Oregon (Josephine, Jackson, Klamath): EPA Zone 1 — highest risk. Gold Hill, Medford, Klamath Falls areas see frequent readings above 10 pCi/L.
- Eastern Oregon (Grant, Harney, Baker, Malheur): Zone 1–2. Volcanic and granitic geology produces elevated readings.
- Willamette Valley (Portland, Salem, Eugene): Zone 2 — moderate risk. Not as dramatic, but testing is still important.
- Oregon Coast: Zone 3 — low risk, though individual homes can still test high.
Cost by Foundation Type
Slab-on-Grade: $1,000–$2,200
Common in newer Portland suburbs and the Willamette Valley. Standard installation pricing.
- Standard slab: $1,000–$1,600
- Complex routing or larger home: $1,500–$2,200
Crawl Space: $2,500–$5,500
Oregon's older housing stock — particularly in Portland, Eugene, Medford, and Grants Pass — often features full or partial crawl spaces. Southern Oregon crawl spaces can have rock, debris, and moisture issues from heavy rainfall.
- Clean crawl space, good access: $2,500–$3,500
- Vapor barrier needed: $3,000–$4,500
- Difficult access or high radon: $4,000–$5,500
Finished Basement: $1,100–$2,400
Basements are less common in Oregon than the Midwest but exist in older Portland and Salem homes. Pricing follows national norms.
Oregon-Specific Cost Factors
Southern Oregon geology: Josephine and Jackson counties sit on ultramafic rocks (peridotite, serpentinite) that can produce unusually high radon levels. Systems in this area sometimes need premium fans and multiple suction points.
Rain and moisture: Oregon's wet climate means crawl space moisture management is frequently bundled with mitigation. Ask for separate line items so you know what you're paying for each component.
Contractor shortage in rural areas: Eastern Oregon and the southern counties have very few certified contractors. Expect to wait longer and possibly pay travel fees.
Portland metro pricing: The Portland area has competitive pricing and good contractor availability. Expect $1,000–$1,800 for most slab homes.
Oregon Resources
- Oregon Health Authority Radon Program: oregon.gov/oha (search "radon")
- Verify NRPP: radonproficiency.org
- Verify NRSB: nrsb.org
Frequently Asked Questions
Which parts of Oregon have the highest radon levels?
Southern Oregon (Josephine, Jackson, Klamath counties) and Eastern Oregon (Grant, Harney, Baker counties) have the highest readings. The Willamette Valley is generally Zone 2, and the Coast is Zone 3.
How much does radon mitigation cost in Oregon?
Most Oregon homes run $1,000–$2,200 for slab or basement systems. Crawl spaces — common in older Oregon homes — cost $2,500–$5,500.
Does Oregon require radon contractor licensing?
Oregon does not have a state radon contractor licensing program. Look for NRPP or NRSB nationally certified contractors.
Find a Certified Mitigator Near You
Every contractor on RadonBase is NRPP or NRSB certified — mitigators only, no testers.
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