# Radon Mitigation in Swansea, IL

- **URL:** https://airsenseenvironmental.com/service-area/swansea-il/radon-mitigation/
- **Published:** 2026-07-20

Skip to content Radon Mitigation Services ▾ Radon Testing Commercial Radon Mitigation Commercial Radon Testing Indoor Air Quality Crawl Space Encapsulation Service Area Resources FAQ Blog Podcast Reviews & Projects About Us Contact 314-664-9807 Free Estimate Radon Mitigation Services Radon Testing Commercial Radon Mitigation Commercial Radon Testing Indoor Air Quality Crawl Space Encapsulation Company Service Area Resources FAQ Blog Podcast Reviews & Projects Case Studies Media Room About Us Contact Call 314-664-9807 Home › Service Area › Swansea, IL › Radon Mitigation Service Area · Swansea, IL Radon Mitigation in Swansea, IL Radon mitigation in Swansea, IL lowers indoor radon below the EPA action level of 4.0 pCi/L by drawing soil gas from beneath the foundation and venting it above the roofline. Air Sense Environmental designs and installs sub-slab depressurization systems for Swansea homes in St. Clair County, then proves the result with a post-mitigation test. IEMA-Certified Free In-Home Estimates Call 314-664-9807 Get a Free Estimate Does a Swansea home need radon mitigation? A Swansea home needs radon mitigation when a test comes back at or above 4.0 pCi/L, and the EPA suggests considering it between 2 and 4 pCi/L. St. Clair County is in EPA Radon Zone 2, where the predicted average indoor radon level is 2 to 4 pCi/L, and individual Swansea homes routinely test well above the 4.0 pCi/L action level. The Illinois Department of Public Health reports that about 41 percent of Illinois homes tested have come back at or above 4.0 pCi/L, and Illinois requires radon professionals to hold an IEMA license. Swansea is a St. Clair County village between Belleville and Fairview Heights, with mid-century homes near its older core and newer subdivisions on poured basements to the north. If the home has not been tested yet, start with the St. Louis radon testing page. Which radon mitigation system fits a Swansea home? The system follows the foundation: Basement slab: sub-slab depressurization, the most common system in Swansea Crawl space: sub-membrane depressurization under a sealed vapor barrier Sump pit: a sealed sump lid tied into the system, covered in the sump pump radon mitigation guide Slab-on-grade: a suction point routed through a garage, closet or exterior wall Mixed foundations: multiple suction points balanced on one fan The Swansea homes Air Sense Environmental mitigates most often: Mid-century ranch homes with basements 1990s and 2000s subdivision homes on poured basements Homes near Scott Air Force Base bought and sold on military timelines Villas on slab foundations How is a radon mitigation system installed in Swansea? Assessment and diagnostics. The foundation, sump, cracks and pipe route are checked during a free in-home estimate. Suction point. A core hole through the slab, or a sealed membrane in a crawl space, gives the fan something to pull from. Pipe and fan. PVC pipe runs to a fan mounted outside the living space, in the attic, garage or on an exterior wall, and vents above the roofline. Sealing. Cracks, the sump lid and other openings are sealed so the fan can hold suction. Manometer and verification. A U-tube manometer shows the system is running, and a post-mitigation test proves the result. Most Swansea installations are completed in a single day. The full walk-through is on the radon mitigation system installation page. How much does radon mitigation cost in Swansea, IL? The price depends on the foundation type, the number of suction points and the fan size, so every Swansea system is quoted after a free in-home assessment. Current price ranges are kept in one place, the St. Louis radon mitigation cost guide. How do you know the radon mitigation system worked? A post-mitigation radon test is the only proof. Air Sense Environmental includes it, designs Swansea systems to a target well below the 4.0 pCi/L action level, and recommends retesting every two years. When a fan eventually wears out, radon fan replacement restores the system. Swansea neighborhoods and nearby communities Air Sense Environmental works across Swansea, IL, including the Route 159 corridor, the neighborhoods around Melvin Price Memorial Park and the subdivisions toward Fairview Heights, in ZIP code 62226. Nearby communities with their own service pages: Radon mitigation and testing in Belleville, IL Radon mitigation and testing in Fairview Heights, IL Radon mitigation and testing in O’Fallon, IL Radon mitigation and testing in Millstadt, IL All Air Sense Environmental service areas Explore More From Air Sense More in Swansea, IL Swansea, IL hub Radon Mitigation Nearby Radon Mitigation in Troy, ILRadon Mitigation in University City, MORadon Mitigation in Waterloo, ILRadon Mitigation in Webster Groves, MORadon Mitigation in Wildwood, MO Learn More Radon Mitigation in St. Louis, MOAll Service AreasReviews & ProjectsGet a Free Estimate Get Your Number Radon under control. Air you can trust. Free in-home estimate, custom-designed system, 24-hour availability. Call 314-664-9807 5237 Old Alton Edwardsville Rd Edwardsville, IL 62025 314-664-9807 · Open 24 hours Jacob Lusby · Illinois IEMA RNM20232346 Services Radon Mitigation Radon Testing Commercial Radon Commercial Radon Testing Radon Fan Replacement Sub-Slab Depressurization Indoor Air Quality Crawl Space Encapsulation Company About Us Service Area Reviews & Projects Case Studies FAQ Blog Podcast Resources Media Room Contact © 2026 Air Sense Environmental. All rights reserved. Radon Mitigation & Testing · St. Louis, MO & Metro East, IL Call 314-664-9807 Free Estimate