Radon mitigation in Rockford, IL

Mitigation means changing a building to reduce indoor radon. In Illinois, it must be done by an IEMA-OHS-licensed mitigation professional. This site explains the process; it doesn't do the work.

How most systems work

IEMA-OHS says the most common technique is sub-slab depressurization (SSD), which “does not require major renovations.”^[1] A pipe and fan draw radon from beneath the floor and vent it to the outside.^[2] EPA says some radon reduction systems can cut levels by up to 99%.^[2]

Who can do it

• Illinois requires an IEMA-OHS license to perform a service to reduce radon for compensation.^[3]
• Look the company up in the IEMA-OHS licensee lookup. Choose license type “Mitigation Professional” and service county “Winnebago.” A measurement-only license does not cover installing systems.
• Get two or three written estimates. That is IEMA's own advice.^[4]

After installation: test again

IEMA-OHS says post-mitigation testing must be performed to confirm the system works.^[1] Illinois rules generally bar a mitigator from doing the before-and-after measurements at the same address unless an independent person does the measuring. Many homeowners choose a separate licensed measurement professional or a lab-analyzed kit for the follow-up test.^[5]

Questions to ask a licensed mitigator

• What is your IEMA-OHS license number, and does it say “Mitigation Professional”?
• Where will the pipe run and the fan sit? Where will it exhaust?
• What is in the written quote: fan model, suction points, sealing, electrical, warranty?
• How will the follow-up test be done, and by whom?
• What does the fan cost to run? (IEMA-OHS estimates about $100 a year on average.^[1])

See published cost ranges →

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