Radon Testing & Mitigation in Granite City, IL

Air Sense Environmental provides radon testing, radon mitigation, indoor air quality testing and crawl space encapsulation in Granite City, IL. The company is IEMA-licensed (#RNM20232346) and NRPP-certified, works across Madison County from its Edwardsville, Illinois headquarters, and measures every radon job against the EPA action level of 4.0 pCi/L.

Is radon a problem in Granite City, IL?

Yes. 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.

Radon varies house by house rather than neighborhood by neighborhood. Two homes on the same Granite City street, built the same year by the same builder, can test at 1 pCi/L and 12 pCi/L because of what sits under each lot and how each foundation was sealed.

Radon testing in Granite City, IL

Radon testing in Granite City uses a calibrated continuous radon monitor for a 48-hour closed-house test, with hourly readings and tamper detection that hold up in a real estate transaction. The St. Louis radon testing page covers how the test works, and the radon testing cost guide holds current pricing.

Radon mitigation in Granite City, IL

Radon mitigation in Granite City means a sub-slab depressurization system designed around the specific foundation, with the fan outside the living space and a post-mitigation test to prove the result. See radon mitigation in Granite City for the process, documented results and warranty.

Indoor air quality testing in Granite City, IL

Indoor air quality testing in Granite City measures particulates, VOCs, carbon dioxide, carbon monoxide, temperature and humidity over at least 48 hours, with radon as an optional add-on, and ends in a written report. Details are on the St. Louis indoor air quality testing page.

Crawl space encapsulation in Granite City, IL

Crawl space encapsulation in Granite City seals the floor and walls with a reinforced vapor barrier, closes the vents and controls humidity with a dehumidifier, which also cuts off a common radon pathway. Read more on the St. Louis crawl space encapsulation page.

Which Granite City homes does Air Sense Environmental work on?

The Granite City homes the team sees 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

What should Granite City homeowners expect?

1. Test first. A 48-hour continuous monitor test gives the number everything else depends on.
2. Read the report together. You get the hourly data and a plain explanation of what it means for the house.
3. Design the fix. If the reading is at or above 4.0 pCi/L, the system is designed around your foundation during a free in-home estimate.
4. Install and verify. Most systems go in within a single day, and a post-mitigation test confirms the result.

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

From Our Work