Radon Testing & Mitigation in Valley Park, MO

In Valley Park, MO, Air Sense Environmental tests homes for radon, installs radon mitigation systems, tests indoor air quality and encapsulates crawl spaces. Every radon job in St. Louis County is measured against the EPA action level of 4.0 pCi/L, and the team is NRPP-certified and IEMA-licensed (#RNM20232346).

Is radon a problem in Valley Park, 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 Valley Park 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. Valley Park sits in the Meramec River floodplain behind a levee, with an older town core on the flats and newer subdivisions on the hills above it.

A Valley Park neighbor’s reading is a signal, not an answer. The soil under one lot, the cracks in one slab and the way one sump pit was sealed decide the number, which is why two similar homes a few doors apart can land on opposite sides of the action level.

Radon testing in Valley Park, MO

A Valley Park radon test runs 48 hours under closed-house conditions on a calibrated continuous monitor, and the report shows the hourly data as well as the average. The St. Louis radon testing page covers how the test works, and the radon testing cost guide holds current pricing.

Radon mitigation in Valley Park, MO

When a Valley Park home tests at or above 4.0 pCi/L, the same team designs and installs the radon mitigation system, usually in a single day, and retests to confirm the home is below the action level. See the St. Louis radon mitigation services page for the process, documented results and warranty.

Indoor air quality testing in Valley Park, MO

An indoor air quality assessment for a Valley Park home logs particulate matter, chemical vapors, CO2, CO and humidity at one-minute intervals for 48 hours or more, so the fix is based on data. Details are on the St. Louis indoor air quality testing page.

Crawl space encapsulation in Valley Park, MO

For Valley Park homes with a crawl space, encapsulation lays a sealed vapor barrier over the soil and walls and adds humidity control, keeping damp air and soil gas out of the rooms above. Read more on the St. Louis crawl space encapsulation page.

Which Valley Park homes does Air Sense Environmental work on?

The Valley Park homes the team sees most often:

• Older homes in the town core with crawl spaces or raised foundations
• Hillside subdivision homes with walkout basements
• Homes with sump pumps near the river
• Newer homes on poured basements off Highway 141

What should Valley Park 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.

Valley Park neighborhoods and nearby communities

Air Sense Environmental works across Valley Park, MO, including the old town core near the Meramec River, the Highway 141 corridor and the hillside subdivisions toward Ballwin, in ZIP code 63088. Nearby communities with their own service pages:

• Radon testing and mitigation in Fenton, MO
• Radon testing and mitigation in Kirkwood, MO
• Radon testing and mitigation in Ballwin, MO
• Radon testing and mitigation in Eureka, MO
• All Air Sense Environmental service areas

From Our Work