Radon Testing & Mitigation in Hazelwood, MO

Hazelwood, 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 Hazelwood, 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 Hazelwood 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. Hazelwood in north St. Louis County was built out in the 1950s to 1970s near Lambert Airport, mostly as ranch homes on block and poured basements.

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

Radon testing in Hazelwood, MO

For radon testing in Hazelwood, 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 Hazelwood, MO

A Hazelwood 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 Hazelwood, MO

For indoor air quality in Hazelwood, 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 Hazelwood, MO

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

The Hazelwood homes the team sees most often:

• 1950s to 1970s ranch homes with basements
• Split-level homes where the lower level is a family room
• Homes with floor drains and sump pits
• Townhomes and villas with ground-level units

What should Hazelwood 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.

Hazelwood neighborhoods and nearby communities

Air Sense Environmental works across Hazelwood, MO, including the Howdershell Road and Lindbergh Boulevard corridors and the neighborhoods near St. Cin Park, in ZIP code 63042. Nearby communities with their own service pages:

• Radon testing and mitigation in Florissant, MO
• Radon testing and mitigation in Maryland Heights, MO
• Radon testing and mitigation in St. Louis, MO
• Radon testing and mitigation in St. Charles, MO
• All Air Sense Environmental service areas

From Our Work