Radon Testing & Mitigation in Richmond Heights, MO

Air Sense Environmental provides radon testing, radon mitigation, indoor air quality testing and crawl space encapsulation in Richmond Heights, MO. The company is IEMA-licensed (#RNM20232346) and NRPP-certified, works across St. Louis County from its Edwardsville, Illinois headquarters, and measures every radon job against the EPA action level of 4.0 pCi/L.

Is radon a problem in Richmond Heights, 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 Richmond Heights 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. Richmond Heights is an inner-ring suburb of 1920s to 1940s brick homes between Clayton and Maplewood, most on full basements that have been finished at some point.

Radon varies house by house rather than neighborhood by neighborhood. Two homes on the same Richmond Heights street, built the same year by the same builder, can test at 1 pCi/L and 12 pCi/L because of what sits under each lot and how each foundation was sealed.

Radon testing in Richmond Heights, MO

Radon testing in Richmond Heights uses a calibrated continuous radon monitor for a 48-hour closed-house test, with hourly readings and tamper detection that hold up in a real estate transaction. The St. Louis radon testing page covers how the test works, and the radon testing cost guide holds current pricing.

Radon mitigation in Richmond Heights, MO

Radon mitigation in Richmond Heights means a sub-slab depressurization system designed around the specific foundation, with the fan outside the living space and a post-mitigation test to prove the result. See radon mitigation in Richmond Heights for the process, documented results and warranty.

Indoor air quality testing in Richmond Heights, MO

Indoor air quality testing in Richmond Heights measures particulates, VOCs, carbon dioxide, carbon monoxide, temperature and humidity over at least 48 hours, with radon as an optional add-on, and ends in a written report. Details are on the St. Louis indoor air quality testing page.

Crawl space encapsulation in Richmond Heights, MO

Crawl space encapsulation in Richmond Heights seals the floor and walls with a reinforced vapor barrier, closes the vents and controls humidity with a dehumidifier, which also cuts off a common radon pathway. Read more on the St. Louis crawl space encapsulation page.

Which Richmond Heights homes does Air Sense Environmental work on?

The Richmond Heights homes the team sees most often:

• 1920s to 1940s brick homes with full basements
• Homes with basements finished decades ago, often without sealing the slab
• Two-family flats and ground-floor condominium units
• Newer townhomes near the Interstate 64 corridor

What should Richmond Heights 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.

Richmond Heights neighborhoods and nearby communities

Air Sense Environmental works across Richmond Heights, MO, including the neighborhoods around the Saint Louis Galleria, Big Bend Boulevard and Clayton Road, in ZIP code 63117. Nearby communities with their own service pages:

• Radon testing and mitigation in Clayton, MO
• Radon testing and mitigation in Brentwood, MO
• Radon testing and mitigation in Maplewood, MO
• Radon testing and mitigation in University City, MO
• All Air Sense Environmental service areas

From Our Work