Radon Testing & Mitigation in Wentzville, MO

Air Sense Environmental provides radon testing, radon mitigation, indoor air quality testing and crawl space encapsulation in Wentzville, MO. The company is IEMA-licensed (#RNM20232346) and NRPP-certified, works across St. Charles 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 Wentzville, MO?

Yes. St. Charles County is in EPA Radon Zone 2, where the predicted average indoor radon level is 2 to 4 pCi/L, and individual Wentzville 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. Wentzville is the fastest-growing city in the metro, and most of its homes were built in the 2000s and 2010s, many on slab-on-grade or poured-basement foundations that sit directly on sub-slab gravel, which moves radon efficiently.

Radon varies house by house rather than neighborhood by neighborhood. Two homes on the same Wentzville 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 Wentzville, MO

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

Radon mitigation in Wentzville, MO

Radon mitigation in Wentzville 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 the St. Louis radon mitigation services page for the process, documented results and warranty.

Indoor air quality testing in Wentzville, MO

Indoor air quality testing in Wentzville 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 Wentzville, MO

Crawl space encapsulation in Wentzville 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 Wentzville homes does Air Sense Environmental work on?

The Wentzville homes the team sees most often:

• 2000s and 2010s two-story homes on poured basements in the subdivisions off Wentzville Parkway and Highway Z
• Slab-on-grade villas and ranch homes, where the slab is the direct radon pathway
• Homes in the older core near downtown Wentzville and the Wabash rail corridor
• New construction, which should get a baseline test even when the builder installed a passive radon pipe

What should Wentzville 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.

Wentzville neighborhoods and nearby communities

Air Sense Environmental works across Wentzville, MO, including downtown Wentzville, the Wentzville Parkway corridor and the subdivisions along Highway Z, in ZIP code 63385. Nearby communities with their own service pages:

• Radon testing and mitigation in O’Fallon, MO
• Radon testing and mitigation in St. Peters, MO
• Radon testing and mitigation in St. Charles, MO
• All Air Sense Environmental service areas

From Our Work