2026-05-08 · 5 min read
Radon Mitigation Cost in Indiana (2026)
Indiana averages 5.6 pCi/L — higher than most homeowners expect. Here's what mitigation costs in Indianapolis, Fort Wayne, and across the state.
Indiana Radon at a Glance
Indiana averages 5.6 pCi/L statewide — higher than the EPA action level and higher than many Hoosiers expect. The Indiana State Department of Health estimates roughly 40–45% of Indiana homes test above 4 pCi/L.
Northern Indiana is particularly affected. The glaciated plains of Marshall, Kosciusko, Pulaski, and Fulton counties sit on uranium-bearing glacial till. Indianapolis and its surrounding suburbs also test well above the national average.
What Mitigation Costs in Indiana
Indiana is a competitively priced market — lower than Chicago, slightly below Ohio.
Slab or Basement: $800–$1,900
- Simple slab, Indianapolis metro: $850–$1,400
- Finished basement: $1,100–$1,800
- Fort Wayne / South Bend: $800–$1,600
- Multiple foundation zones: $1,400–$2,200
Crawl Space: $2,500–$5,500
Indiana has a meaningful crawl space housing stock, particularly in rural communities and older housing in Terre Haute, Muncie, and Anderson.
- Basic crawl space: $2,500–$3,500
- With vapor barrier: $3,000–$5,000
- Large or difficult access: $3,800–$5,500
No Licensing: What It Means
Because Indiana doesn't license radon contractors, anyone can call themselves a radon mitigator. This makes NRPP or NRSB certification the only reliable quality signal. Always ask for the certification number and verify it at radonproficiency.org or nrsb.org before signing.
Indianapolis Real Estate and Radon
Radon testing is increasingly standard in Indianapolis real estate transactions, especially in the northern suburbs (Carmel, Fishers, Zionsville, Noblesville). Hamilton County tests notably higher than the state average. If you're buying in these areas, a radon contingency is common.
Indiana Resources
- Indiana State Department of Health: in.gov/health or 317-233-7177
- Radon information: in.gov/health/eph/radon
- Verify NRPP: radonproficiency.org
Frequently Asked Questions
How much does radon mitigation cost in Indiana?
Indiana homeowners typically pay $800–$1,900 for a standard slab or basement job — slightly below the national average due to lower labor costs. Crawl spaces run $2,500–$5,500.
Which Indiana counties have the highest radon?
Northern Indiana counties over glaciated terrain — Marshall, Kosciusko, Fulton, and Pulaski — test highest. The Indianapolis metro (Marion, Hamilton, Hendricks counties) also averages well above 4 pCi/L.
Does Indiana require a licensed radon contractor?
Indiana does not currently require state licensing for radon mitigators. The Indiana State Department of Health recommends NRPP or NRSB certified contractors. Without a licensing requirement, verifying certification yourself is especially important.
Is radon common in Indianapolis homes?
Yes. Marion County averages approximately 5.0–5.5 pCi/L. Indianapolis-area homes, particularly those with basements in northern Marion, Hamilton, and Hendricks counties, test above the action level at a significant rate. Radon testing is increasingly standard in Indianapolis real estate transactions.
Find a Certified Mitigator Near You
Every contractor on RadonBase is NRPP or NRSB certified — mitigators only, no testers.
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