Radon Mitigation in Springfield, IL

Radon Mitigation in Springfield, Illinois

Springfield and Sangamon County sit in EPA Radon Zone 1. Illinois's statewide average of approximately 4.6 pCi/L exceeds the EPA action level, and central Illinois including the Springfield metro is among the state's highest-risk regions. The Illinois Emergency Management Agency (IEMA) has identified Sangamon County as a significant radon concern.

Why Springfield Has High Radon Levels

Central Illinois sits on glacial till over sedimentary rock including uranium-bearing shale. Springfield's permeable glacial soils allow radon to migrate freely from ground to foundation. The city's diverse housing stock — from pre-1940 brick homes near the State Capitol to post-WWII ranch homes on the west side — all present radon entry points, and Illinois's cold winters concentrate indoor levels.

What Radon Mitigation Costs in Springfield

• Standard basement home: $800–$1,300
• Slab-on-grade: $850–$1,400
• Older block or stone foundations: $1,100–$1,700
• Finished basement: Add $200–$400

Springfield's mid-state location draws contractors from both Chicago and St. Louis markets, supporting competitive pricing.

Illinois Contractor Licensing

Illinois requires radon contractors to hold a license from the Illinois Emergency Management Agency (IEMA) in addition to NRPP or NRSB national certification. Verify both credentials before signing a contract — IEMA licensing is required by Illinois law.

Finding a Certified Mitigator in Springfield

Find a Certified Radon Mitigator in Springfield →

Sangamon County has multiple IEMA-licensed, NRPP-certified contractors. Average mitigation costs run $900–$1,300.