Radon Mitigation in Des Peres, MO

Radon mitigation in Des Peres, MO fixes a home that tested at or above the EPA action level of 4.0 pCi/L. Air Sense Environmental installs sub-slab and sub-membrane depressurization systems across St. Louis County, routes the fan outside the living space, and retests to confirm the number came down.

Does a Des Peres home need radon mitigation?

Mitigation follows measurement. If a Des Peres home tests at or above 4.0 pCi/L the EPA recommends a system, and readings between 2 and 4 pCi/L are worth discussing. St. Louis County is in EPA Radon Zone 2, where the predicted average indoor radon level is 2 to 4 pCi/L, and individual Des Peres 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.

Des Peres mixes 1950s to 1970s ranch homes with a steady stream of new infill construction, so neighboring houses can sit on foundations built fifty years apart. If the home has not been tested yet, start with the St. Louis radon testing page.

Which radon mitigation system fits a Des Peres home?

The system follows the foundation:

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

• 1950s to 1970s ranch homes with basements
• New infill homes on deep poured foundations with finished lower levels
• Homes with walkout basements along the creeks
• Homes changing hands, where a test during the inspection period protects both sides

How is a radon mitigation system installed in Des Peres?

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 Des Peres 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 Des Peres, MO?

Air Sense Environmental quotes each Des Peres job after seeing the foundation, because suction points and fan size drive the cost. For current ranges by system type, see 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 Des Peres 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.

Des Peres neighborhoods and nearby communities

Air Sense Environmental works across Des Peres, MO, including the Manchester Road corridor, the neighborhoods near Des Peres Park and West County Center, in ZIP code 63131. Nearby communities with their own service pages:

• Radon mitigation and testing in Kirkwood, MO
• Radon mitigation and testing in Ballwin, MO
• Radon mitigation and testing in Creve Coeur, MO
• Radon mitigation and testing in Valley Park, MO
• All Air Sense Environmental service areas