FAQ

Radon is a radioactive gas formed naturally when uranium in soil and rock breaks down. You cannot see, smell, or taste it. It enters buildings through cracks, sumps, and openings and can accumulate to levels that increase lifetime risk of lung cancer. The EPA and Illinois public health programs recommend testing all homes and fixing elevated levels with a properly designed mitigation system.

The EPA action level is 4.0 picocuries per liter (pCi/L) based on long-term exposure. That does not mean 3.9 is “safe” or that 4.1 is an emergency—it is a practical threshold for deciding to mitigate. Many Illinois homeowners choose to mitigate below 4 pCi/L, especially for long-term occupancy, bedrooms used by kids, or when a prior test was borderline. Your mitigation contractor can interpret your test report in context.

You need a professional mitigation design if a reliable test (short-term or long-term) shows elevated radon and you want to reduce indoor levels for health and peace of mind. A single short-term test is a snapshot; follow-up testing or longer tests sometimes clarify borderline results. Mitigation is not a substitute for testing—you should test first, then design to the foundation and soil conditions on your lot.

Most Illinois homes use active soil depressurization: a sealed suction point and piping route radon-laden soil gas to the exterior before it enters living space, assisted by a specialized fan. The exact layout depends on your foundation (basement, crawlspace, slab, or mixed), drain tile, and where we can run pipe discreetly. After install, a follow-up test confirms performance.

Many residential installs are completed in a day once materials and routing are finalized, but complex foundations, long pipe runs, interior routing, or crawlspace prep can take longer. We give you a written scope and schedule after a site visit so you know what to expect before work starts.

Fans produce a low hum similar to other small exterior mechanical equipment. We select fan models and locations to meet performance while minimizing noise at patios, bedrooms, and neighbor lines. If an existing fan is loud or failing, repairs or upgrades often improve both sound and performance.

Yes. Crawlspaces often need sealing or encapsulation so a mitigation system can depressurize the soil reliably. We coordinate vapor barrier work, pier and penetration sealing, and radon piping when both moisture and radon are concerns. Mixed basement/crawl homes are common in Central Illinois and need an integrated plan.

Illinois regulates radon professionals so systems meet state standards, protect occupants, and document work for real estate and insurance. Always verify that your contractor holds current IEMA mitigation authorization (and NRPP or equivalent credentials you require). Unlicensed work can fail inspection and leave you without recourse.

Real estate timelines often rely on a recent radon test and, if levels are high, a mitigation bid or completed system before closing. Keep lab reports, chain-of-custody, and closed-building conditions with the disclosure packet. We can scope work from your inspection report and coordinate with your agent and closing date when possible.

Yes. Post-mitigation testing confirms the system is achieving the expected reduction—typically placed per EPA guidance away from drafts and the suction point. Retesting after major foundation changes or fan replacement is also wise. We can advise on test placement and timing.

Sealing helps support a system but rarely lowers radon enough on its own, and over-sealing can affect drainage or other building systems. Illinois standards expect engineered soil gas control, not caulk-only fixes. If you are comparing DIY approaches, start with a proper test and a written scope from a licensed contractor.

Call 217-520-6630 during business hours, email us, or use the free quote form on this site. If you already have a test result, include it; if not, share your foundation type, city or ZIP, and any existing mitigation equipment so we can guide next steps. We follow up with targeted questions and, when appropriate, schedule a site visit for a clear written estimate.