Independent guide · not a radon company
Radon testing and mitigation in Rockford, IL, explained by an independent guide
We explain how radon testing and mitigation work in Rockford and Winnebago County, what Illinois law requires, and how to check that a professional is licensed. We do not test or install anything. In Illinois, that work must be done by IEMA-OHS-licensed professionals.
- Winnebago County is in EPA Radon Zone 1, the highest-potential category.[1]
- In IEMA-OHS public data, about 37% of 8,595 licensee-reported Winnebago County tests were at or above 4 pCi/L.[2]
- IEMA-OHS says an active system typically costs $1,000 to $1,500 installed.[3]
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Radon testing
Do-it-yourself kits, professional tests, and what the numbers mean.
Radon mitigation
How sub-slab systems work and what to ask a licensed mitigator.
Cost
Published Illinois cost ranges with sources, and what changes the price.
Buying or selling
Illinois Radon Awareness Act disclosure and real-estate testing protocols.
Check any radon professional's license
Illinois law says no person may perform radon testing or mitigation for compensation without an IEMA-OHS license.[4] Before you hire anyone, look up their name or license number in the IEMA-OHS licensee lookup (choose service county “Winnebago”).
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Sources
- U.S. EPA, Map of Radon Zones (PDF)
- IEMA-OHS radon results dashboard (public measurement data; Winnebago counts tallied Nov 14, 2026)
- IEMA-OHS, “What is Radon?” (cost, fan energy, action level, SSD)
- Radon Industry Licensing Act, 420 ILCS 44 (Sec. 25 license requirement)
Sources reviewed November 14, 2026.