Radon Testing & Mitigation in Alton, IL

Alton, IL homeowners call Air Sense Environmental for four things: radon testing, radon mitigation, indoor air quality testing and crawl space encapsulation. The NRPP-certified, IEMA-licensed (#RNM20232346) team serves Madison County from Edwardsville, Illinois, and designs every radon system to bring the home below the EPA action level of 4.0 pCi/L.

Is radon a problem in Alton, 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 Alton 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. Alton climbs limestone bluffs above the Mississippi River, and much of its housing is 19th and early 20th century brick on stone foundations, with cellars and crawl spaces that let soil gas move freely.

Because radon depends on the ground under a single lot and the openings in a single foundation, Alton results change from address to address. Testing the specific house is the only way to know where it stands.

Radon testing in Alton, IL

For radon testing in Alton, Air Sense Environmental places a continuous monitor on the lowest livable level for 48 hours and delivers a documented report against the 4.0 pCi/L action level. The St. Louis radon testing page covers how the test works, and the radon testing cost guide holds current pricing.

Radon mitigation in Alton, IL

A Alton radon mitigation system pulls soil gas from beneath the slab or crawl space membrane and vents it above the roofline; every install ends with a verification test. See the St. Louis radon mitigation services page for the process, documented results and warranty.

Indoor air quality testing in Alton, IL

For indoor air quality in Alton, a continuous monitor tracks particulates, VOCs, carbon dioxide, carbon monoxide and humidity, and the report shows which readings sit outside healthy ranges. Details are on the St. Louis indoor air quality testing page.

Crawl space encapsulation in Alton, IL

A sealed, conditioned crawl space keeps ground moisture and soil gas from rising into a Alton home; Air Sense Environmental installs the barrier, seals the vents and sizes the dehumidifier. Read more on the St. Louis crawl space encapsulation page.

Which Alton homes does Air Sense Environmental work on?

The Alton homes the team sees most often:

• Historic brick homes in the Middletown and Christian Hill districts with stone foundations
• Upper Alton homes from the early 1900s with cellars and partial basements
• Mid-century ranches on the east side with block basements
• Homes built into the bluffs with walkout lower levels

What should Alton 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.

Alton neighborhoods and nearby communities

Air Sense Environmental works across Alton, IL, including the Middletown and Christian Hill historic districts, Upper Alton and the riverfront, in ZIP code 62002. Nearby communities with their own service pages:

• Radon testing and mitigation in Godfrey, IL
• Radon testing and mitigation in Bethalto, IL
• Radon testing and mitigation in Elsah, IL
• Radon testing and mitigation in Edwardsville, IL
• All Air Sense Environmental service areas

From Our Work