Radon Mitigation in University City, MO

Radon mitigation in University City, MO 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 University City homes in St. Louis County, then proves the result with a post-mitigation test.

Does a University City home need radon mitigation?

A University 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. 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. If the home has not been tested yet, start with the St. Louis radon testing page.

Which radon mitigation system fits a University City home?

The system follows the foundation:

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

How is a radon mitigation system installed in University 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 University 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 University City, MO?

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

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