Radon Mitigation in Maplewood, MO

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

Does a Maplewood home need radon mitigation?

A Maplewood 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 Maplewood 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.

Maplewood is an inner-ring suburb of early 1900s brick homes and four-squares, where stone and brick foundations, cellars and shared walls are the norm. If the home has not been tested yet, start with the St. Louis radon testing page.

Which radon mitigation system fits a Maplewood home?

The system follows the foundation:

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

• Early 1900s brick homes and four-squares with stone or brick foundations
• Two-family flats, where the first-floor unit sits over the basement
• Bungalows with partial basements and crawl spaces
• Renovated homes with newly finished basements

How is a radon mitigation system installed in Maplewood?

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 Maplewood 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 Maplewood, MO?

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

Maplewood neighborhoods and nearby communities

Air Sense Environmental works across Maplewood, MO, including the Manchester Road business district and the neighborhoods around Ryan Hummert Park, in ZIP code 63143. Nearby communities with their own service pages:

• Radon mitigation and testing in Brentwood, MO
• Radon mitigation and testing in Richmond Heights, MO
• Radon mitigation and testing in Webster Groves, MO
• Radon mitigation and testing in St. Louis, MO
• All Air Sense Environmental service areas