Radon Testing & Mitigation in Kirkwood, MO

Kirkwood, MO 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 St. Louis 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 Kirkwood, 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 Kirkwood 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. Kirkwood is one of the oldest suburbs in St. Louis County, and much of its housing predates 1950, which means limestone and stone foundations, cellars and low crawl spaces that let soil gas move freely into the house.

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

Radon testing in Kirkwood, MO

For radon testing in Kirkwood, 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. Radon testing in Kirkwood covers how the test works, and the radon testing cost guide holds current pricing.

Radon mitigation in Kirkwood, MO

A Kirkwood 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 Kirkwood, MO

For indoor air quality in Kirkwood, 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 Kirkwood, MO

A sealed, conditioned crawl space keeps ground moisture and soil gas from rising into a Kirkwood 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 Kirkwood homes does Air Sense Environmental work on?

The Kirkwood homes the team sees most often:

• Pre-1950 homes near Downtown Kirkwood with limestone or stone-block foundations
• Homes in Meacham Park and North Kirkwood with mixed foundation types and older sill plates
• Mid-century ranches with partial basements and crawl spaces under additions
• Newer infill and tear-down rebuilds on poured basements, which still need a baseline test

What should Kirkwood 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.

Kirkwood neighborhoods and nearby communities

Air Sense Environmental works across Kirkwood, MO, including Downtown Kirkwood, the Kirkwood train station area and the neighborhoods around Kirkwood Park, in ZIP code 63122. Nearby communities with their own service pages:

• Radon testing and mitigation in Webster Groves, MO
• Radon testing and mitigation in Des Peres, MO
• Radon testing and mitigation in Ballwin, MO
• All Air Sense Environmental service areas

From Our Work