Radon Mitigation in Granite City, IL

Radon mitigation in Granite City, 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 Granite City homes in Madison County, then proves the result with a post-mitigation test.

Does a Granite City home need radon mitigation?

A Granite City 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. Madison County is in EPA Radon Zone 2, where the predicted average indoor radon level is 2 to 4 pCi/L, and individual Granite City 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.

Granite City lies on the American Bottom, the Mississippi floodplain, and its early 1900s worker housing sits on shallow basements and crawl spaces above a high water table. If the home has not been tested yet, start with the St. Louis radon testing page.

Which radon mitigation system fits a Granite City home?

The system follows the foundation:

• Basement slab: sub-slab depressurization, the most common system in Granite City
• 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 Granite City homes Air Sense Environmental mitigates most often:

• Early 1900s homes with shallow basements and cellars
• Post-war ranch homes with crawl spaces
• Homes with sump pumps running against a high water table
• Newer homes in the subdivisions toward Pontoon Beach

How is a radon mitigation system installed in Granite City?

1. Assessment and diagnostics. The foundation, sump, cracks and pipe route are checked during a free in-home estimate.
2. Suction point. A core hole through the slab, or a sealed membrane in a crawl space, gives the fan something to pull from.
3. 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.
4. Sealing. Cracks, the sump lid and other openings are sealed so the fan can hold suction.
5. Manometer and verification. A U-tube manometer shows the system is running, and a post-mitigation test proves the result.

Most Granite City 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 Granite City, IL?

The price depends on the foundation type, the number of suction points and the fan size, so every Granite City 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 Granite City 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.

Granite City neighborhoods and nearby communities

Air Sense Environmental works across Granite City, IL, including downtown Granite City, the neighborhoods around Wilson Park and the subdivisions toward Pontoon Beach, in ZIP code 62040. Nearby communities with their own service pages:

• Radon mitigation and testing in Collinsville, IL
• Radon mitigation and testing in Edwardsville, IL
• Radon mitigation and testing in Glen Carbon, IL
• Radon mitigation and testing in St. Louis, MO
• All Air Sense Environmental service areas