St. Louis Metro · Missouri & Illinois
Radon Mitigation in St. Louis, MO
If your radon test came back high, or a home inspection just flagged elevated radon, you don’t have to figure this out alone. We design and install custom mitigation systems across the metro, built for your foundation, your house, and your number.
The Target on Every Install
Systems are engineered to bring your home below the EPA action level of 4.0 pCi/L.
Built to performThe Straight Answer
What Is Radon Mitigation?
Radon mitigation is the process of reducing radon gas concentrations inside a home or building to safe levels using sub-slab depressurization, ventilation systems, and sealing techniques. Air Sense Environmental is St. Louis’s IEMA-certified (License #RNM20232346) and NRPP-certified radon mitigation specialist, serving homes and commercial properties across Missouri and Illinois from our Edwardsville, IL headquarters.
Systems are engineered to bring radon levels below the EPA action level of 4.0 pCi/L, with most homes targeting well under 2.0 pCi/L.
We’ve installed 132+ systems across the St. Louis metro with five-star reviews on every one of them. Call 314-664-9807 for a free in-home estimate.
The Proof
What St. Louis Homeowners Say
The System
What’s Inside a Radon Mitigation System
Every house gets the combination it actually needs, not a one-size kit.
Sub-Slab Depressurization (SSD)
The most common system type: pipes and a fan create a vacuum beneath your foundation, drawing radon from the soil and venting it safely outside, away from occupied areas.
Radon Exhaust Fans
Properly sized fans create negative pressure so radon is effectively pulled from the soil and expelled above the roofline, continuously, 24/7.
Sealing & Caulking
Cracks, gaps, and openings in the foundation or floors are sealed to cut off radon entry routes and make the system more efficient.
Sump-Pump Mitigation
For homes with sump pumps, we repair or replace the lid to create an airtight seal between the sump pit and the air your family breathes.
Crawl Space & Basement Ventilation
Moisture barriers deter soil gases, including radon, from migrating up through dirt floors and porous materials into the living space.
Monitoring & Alarms
Advanced systems can include continuous monitors or alarms. We’re a dealer for all AirThings monitors, check your invoice for discounted long-term monitor pricing.
How It Works
How a Radon Mitigation Install Works, Start to Finish
Free In-Home Assessment
We inspect your foundation type, basement, crawl space, or slab, review your test results, and identify the best suction point and exhaust route.
Custom System Design
Foundation type determines the method. Most St. Louis homes get sub-slab depressurization; crawl space homes get sub-membrane systems. See our guide to the types of radon mitigation systems.
Installation
Most standard single-family installations are completed in a single visit. Read what to expect in our post on how long radon mitigation takes.
Retesting Guidance
We recommend a follow-up radon test after installation, and every two years, to confirm your new level.
Older home? Stone foundations, dirt-floor basements, and additions each need their own approach. See radon mitigation in older St. Louis homes.
Pricing
What Does Radon Mitigation Cost in St. Louis?
Pricing depends on foundation type, home size, and how high your starting level is. Air Sense Environmental provides free written estimates, and our full St. Louis radon mitigation cost guide breaks down every factor, including what makes a system cost more or less.
Not sure whether you need mitigation at all? Start with testing first, our testing vs. mitigation guide explains the order of operations.
Why It Matters
Key Benefits of a Professional Radon Mitigation System
Once high radon levels are confirmed, a professionally installed mitigation system is the only reliable way to significantly reduce radon concentrations, a permanent fix, not a patch.
Protect Your Family’s Health
Radon is the second leading cause of lung cancer in the United States according to the EPA. A mitigation system reduces levels to a safe concentration, significantly lowering the risk for you and your loved ones.
Increase Your Home’s Value
A home with a mitigation system is a selling point, it shows buyers the home is safe and responsibly maintained, a real advantage in a transaction.
Total Peace of Mind
Stop worrying about an invisible threat. A properly functioning system works 24/7, so you know your family is breathing safer, cleaner air.
Better Overall Indoor Air Quality
Beyond venting radon, the system helps reduce moisture and other soil gases entering your home, a less humid, healthier environment.
The Guarantee
We Stand Behind Every Installation
A mitigation system only counts if it works. Air Sense systems are designed and installed to bring your home below the EPA action level of 4.0 pCi/L, and we recommend a follow-up test to confirm your new number.
- If a follow-up reading ever comes back high, we adjust the system at no charge, a bigger fan, a second suction point, or additional sealing, whatever the house needs.
- That guarantee is why home inspectors and real estate agents across the metro refer their clients to us, and why we hold a BBB A rating with 132+ five-star reviews.
- After installation, re-test every two years to confirm ongoing performance, see our system maintenance guide for what to watch between tests.
Still weighing it? Here’s the data on whether radon mitigation really works.
Where We Work
Where We Perform Radon Mitigation
Missouri
St. Louis County and St. Charles County, Chesterfield, Florissant, Kirkwood, Maryland Heights, St. Peters, O’Fallon, St. Charles, Wentzville, and surrounding areas.
Illinois
Alton, Belleville, Bethalto, Collinsville, Edwardsville, Glen Carbon, Godfrey, Granite City, Highland, Maryville, Troy, Fairview Heights, O’Fallon, Swansea, Brighton, Elsah, Jerseyville, and surrounding communities.
Cities We Serve for Radon Mitigation
Air Sense Environmental provides radon mitigation across the greater St. Louis metro and Metro East. Find your area:
Get Your Number
High radon test? Fix it once, fix it right.
Free in-home estimate, custom-designed system, 24-hour availability across the St. Louis metro.
Related
More Radon Mitigation Services
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