Radon Testing & Mitigation in University City, MO

Air Sense Environmental provides radon testing, radon mitigation, indoor air quality testing and crawl space encapsulation in University City, MO. The company is IEMA-licensed (#RNM20232346) and NRPP-certified, works across St. Louis 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 University City, MO?

Yes. St. Louis County is in EPA Radon Zone 2, where the predicted average indoor radon level is 2 to 4 pCi/L, and individual University City homes routinely test well above the 4.0 pCi/L action level. Missouri’s Department of Health and Senior Services reports that roughly one in three homes tested through its statewide program between 2003 and 2023 came back at or above 4.0 pCi/L. University City is an inner-ring suburb of 1900s to 1930s brick homes, from the private streets of University Heights to the blocks around the Delmar Loop, nearly all on older basements.

Radon varies house by house rather than neighborhood by neighborhood. Two homes on the same University 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 University City, MO

Radon testing in University 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 University City, MO

Radon mitigation in University 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 University City for the process, documented results and warranty.

Indoor air quality testing in University City, MO

Indoor air quality testing in University 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 University City, MO

Crawl space encapsulation in University 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 University City homes does Air Sense Environmental work on?

The University City homes the team sees most often:

• 1900s to 1930s brick homes with stone or early poured foundations
• Two-family flats, where the first-floor unit sits over the basement
• Homes with finished basements and basement apartments
• Mid-century ranches in the northern part of the city

What should University 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.

University City neighborhoods and nearby communities

Air Sense Environmental works across University City, MO, including the Delmar Loop, University Heights and the neighborhoods around Heman Park, in ZIP codes 63130 and 63124. Nearby communities with their own service pages:

• Radon testing and mitigation in Clayton, MO
• Radon testing and mitigation in Richmond Heights, MO
• Radon testing and mitigation in Creve Coeur, MO
• Radon testing and mitigation in St. Louis, MO
• All Air Sense Environmental service areas

From Our Work