Radon Testing & Mitigation in Des Peres, MO

Des Peres, 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 Des Peres, 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 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.

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

Radon testing in Des Peres, MO

For radon testing in Des Peres, 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 Des Peres, MO

A Des Peres 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 Des Peres for the process, documented results and warranty.

Indoor air quality testing in Des Peres, MO

For indoor air quality in Des Peres, 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 Des Peres, MO

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

The Des Peres homes the team sees 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

What should Des Peres 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.

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

From Our Work