Radon Testing & Mitigation in Brentwood, MO

Brentwood, 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 Brentwood, 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 Brentwood 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. Brentwood is an inner-ring St. Louis County suburb of 1920s to 1950s brick homes on small lots, nearly all with basements that have had decades to develop cracks and open floor drains.

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

Radon testing in Brentwood, MO

For radon testing in Brentwood, 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. The St. Louis radon testing page covers how the test works, and the radon testing cost guide holds current pricing.

Radon mitigation in Brentwood, MO

A Brentwood 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 radon mitigation in Brentwood for the process, documented results and warranty.

Indoor air quality testing in Brentwood, MO

For indoor air quality in Brentwood, 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 Brentwood, MO

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

The Brentwood homes the team sees most often:

• 1920s to 1950s brick homes with full basements
• Homes with finished basements used as offices or bedrooms
• Tear-down rebuilds on poured foundations, which still need a baseline test
• Condominiums and townhomes with ground-level units

What should Brentwood 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.

Brentwood neighborhoods and nearby communities

Air Sense Environmental works across Brentwood, MO, including the Brentwood Boulevard corridor and the neighborhoods around Brentwood Park, in ZIP code 63144. Nearby communities with their own service pages:

• Radon testing and mitigation in Maplewood, MO
• Radon testing and mitigation in Richmond Heights, MO
• Radon testing and mitigation in Rock Hill, MO
• Radon testing and mitigation in Clayton, MO
• All Air Sense Environmental service areas

From Our Work