Who does radon mitigation in St. Louis?
Air Sense Environmental provides radon mitigation in the St. Louis metro. This website is a focused guide to that service, operated by the same provider. A useful first call starts with your address, the type of foundation and the report that prompted your search.
Call 314-664-9807 to discuss an assessment. Ask how the proposed system will be evaluated after installation; the answer should be part of the scope before work begins.
- Have the complete test report available.
- Describe any basement, slab and crawl space areas.
How do you choose a radon mitigation company?
Choose a radon mitigation company by the clarity of its proposal as well as its qualifications. Ask who will perform the work, which credentials apply to that person, and how the design accounts for your foundation. A low quote is difficult to compare when the retest or electrical work is missing.
- Request a written installation scope.
- Ask who arranges and pays for the retest.
- Read warranty terms and exclusions.
- Confirm the response to an elevated follow-up result.
What houses in St. Louis are most likely to have radon?
A house’s appearance cannot establish its radon level. New construction, a finished basement or a neighbor’s low result is not a substitute for testing your own property. The EPA explains that radon enters buildings from the ground.
For an assessment, describe the building rather than guessing its risk: foundation materials, additions, unfinished areas and access to the lowest level all help make the discussion specific.
Is it safe to live in a house with radon?
A radon test result is a reason to plan exposure reduction, not a medical diagnosis or a guarantee about an individual’s health. CDC identifies long-term radon exposure as a lung cancer risk. Discuss the result with a qualified radon professional; take personal health questions to a clinician.
Keep the report and record any follow-up recommendations. Avoid making decisions from an isolated monitor spike without understanding the measurement period.
What does radon mitigation cost in St. Louis?
Air Sense publishes a typical active sub-slab system range of $1,100 to $3,200. Your written quote determines the actual price and included work. Use the number as a planning range, then ask about foundation access, pipe routing, electrical provisions and post-installation testing.
- Ask whether the quoted amount includes all proposed suction points.
- Identify optional cosmetic routing separately.
How are radon mitigation systems proven to work?
Radon mitigation systems are proven by the follow-up radon test, not by the installation itself. A running fan and a moved manometer show that the system is drawing suction under the slab; only a new measurement of the lowest lived-in level shows whether the radon concentration came down. The EPA recommends fixing a home at 4 pCi/L or higher.
- Start from a radon test of the home.
- Agree on a written scope that names the post-installation test.
- Retest no earlier than 24 hours after the system starts operating and within 30 days, as EPA recommends.
- Retest at least every two years, and after major renovations.
| Check | What it shows | What it cannot show |
|---|---|---|
| U-tube manometer | The fan is creating suction in the pipe | The radon level in your living space |
| Fan running | Power is reaching the fan | That suction reaches the whole foundation |
| Consumer monitor | A trend over days and weeks | A test result for a real estate file |
| Follow-up radon test | The radon level after mitigation | Future levels, which is why periodic retesting matters |
Read Does Radon Mitigation Work? What St. Louis Retests Show for how to read a post-mitigation result.
Does homeowners insurance cover radon removal?
Insurance coverage must be confirmed with your insurer for your own policy and circumstances. Do not count an anticipated reimbursement toward the project budget without a written coverage decision. If a property sale is involved, a negotiated buyer or seller contribution is a separate question from insurance.
Send the insurer the proposed work description if requested. Air Sense can discuss the installation scope; the insurer determines coverage.
Can a sump pit be sealed for radon and still stay accessible?
Often, yes. An open sump pit lets soil gas in and leaks the vacuum a radon system creates under the slab. In a September 2026 Chesterfield installation, Air Sense Environmental sealed a very active sump pit under a custom cover with a viewing window, so the homeowner can watch the pump and check valves without breaking the seal. The system uses one suction point, with the vent routed through the garage and attic.
The homeowner’s EcoQube consumer monitor read 4 to 5+ pCi/L before mitigation, and its 72-hour average settled below 1.0 pCi/L afterward, as he described in his Google review. These are consumer-monitor readings from one house, not a promised result for another home. Air Sense recommends a follow-up radon test after every installation.
What Air Sense customers say
Excerpts from Google reviews of Air Sense Environmental, quoted as written. Reviewer names are withheld; each link opens the full review on Google.
“They took the time to explain the system and installed in most discrete way to minimize any eye sores.”
Google review, August 2026 · Read the full review on Google
“I had options for the setup and the final run of the tubes. The install was limited to the unfinished part of the basement which had a lot going on in a small space. We managed to work around the rest of the infrastructure and the resulting foot print was minimal.”
Google review, January 2026 · Read the full review on Google
“He talked through every step, explained every option, and was extremely professional.”
Google review, March 2024 · Read the full review on Google
See all 167 Google reviews of Air Sense Environmental (rated 5.0 as of October 10, 2026)
Questions before you book
An existing report is the best starting point. If you have no result, say so when calling so testing can be discussed before installation.
Photos can help explain access and routing. Ask whether an on-site assessment is needed before treating an estimate as a final quote.
Keep the proposal, system instructions, warranty terms and follow-up radon report together for future service or a property sale.
Air Sense publishes a typical active sub-slab system range of $1,100 to $3,200. The written quote for your home sets the actual price, so compare what each quote includes, especially suction points, pipe routing, electrical work and the follow-up test.
Check that the fan is running and the manometer shows suction, then rely on the follow-up radon test for the answer. The manometer confirms the system is pulling air; only a test confirms the radon level dropped.
Not exactly. Consumer monitors and professional tests use different devices and measurement periods, so their numbers rarely match. Use a monitor to watch the trend and the follow-up test to judge the result.
Some new homes are built with a passive pipe as a radon-resistant feature. A passive pipe is not the same as an active system with a fan, and EPA advises testing new homes even when those features are present.
Fan sizing, sealing, pipe routing and electrical work all affect whether a system reduces radon and runs safely. In Illinois, radon mitigation must be performed by a licensed mitigator. Whoever installs it, plan the follow-up test.
Ask who will perform the work and which credentials that person holds, then confirm them with the issuing program. Compare written scopes rather than prices alone, and ask how an elevated retest would be handled.
Usually some part of the vent pipe is visible. Routing can often go through a garage and attic instead of up an exterior wall, so ask which options suit your house before work begins.
Check the manometer regularly and follow the installer instructions. EPA recommends retesting a mitigated home at least every two years, and sooner after a fan fault or a major renovation.
Each foundation type has an established design: sub-slab suction for basements and slabs, and a sealed membrane with suction for crawl spaces. Homes that combine areas may need more than one suction point.