Radon Mitigation Services · St. Louis Metro
Radon Mitigation Services in the St. Louis Metro
Air Sense Environmental provides radon mitigation services across the St. Louis metro: radon mitigation system design, installation and post-install verification for homes and businesses in Missouri and Illinois. Our radon mitigation crew is owner-led, every radon mitigation system is built for your foundation, and a written guarantee covers your post-install radon test.
The Radon Mitigation Target on Every Install
Every radon mitigation system is engineered to bring your home below the EPA action level of 4.0 pCi/L, and most finish well under 2.0.
Verified by a follow-up testWho Does the Work
Who Installs Your Radon Mitigation System?
Radon mitigation is the work of reducing radon gas inside a building to a safe level, usually with sub-slab depressurization, sealing and controlled ventilation. Air Sense Environmental is a St. Louis radon mitigation and testing company headquartered in Edwardsville, Illinois. Owner Jake Lusby is an NRPP-certified radon mitigation professional, the company holds Illinois IEMA license #RNM20232346, and every installation is fully insured for residential and commercial work.
We have installed more than 130 radon mitigation systems across the St. Louis metro, on both sides of the river, and we hold a BBB A rating with 150+ five-star Google reviews.
- NRPP-certified radon mitigation professional on every job, not a subcontractor
- IEMA-licensed for Illinois radon mitigation, license #RNM20232346
- BBB accredited, A rating, fully insured
- Members of the Southwestern Illinois Board of Realtors and the St. Louis Association of Realtors, and a HomeAdvisor screened and approved contractor
The Results
Recent Radon Mitigation Projects and Measured Radon Readings
Each radon mitigation project below is a real St. Louis area home, with the radon reading before the radon mitigation system went in and the reading from the post-install radon test. The EPA action level is 4.0 pCi/L.
High-Level Basement Radon Mitigation
- Before: 12 to 14 pCi/L, three to four times the EPA action level
- After: 0.1 to 0.4 pCi/L
- Reduction: about 97 to 99 percent
- System: sub-slab depressurization with a monitored exhaust fan
Severe Radon Reduction From 30+ pCi/L
- Before: more than 30 pCi/L, seven times the EPA action level
- After: less than 1 pCi/L
- Reduction: 96 percent or better
- System: engineered sub-slab depressurization with sealed entry points and a high-flow fan
Two-Zone Whole-Home Radon Mitigation
- Before: 4 pCi/L upstairs and 10 pCi/L in the basement
- After: both zones below 2 pCi/L
- System: multi-point depressurization with balanced exhaust
Sump-Pump-Integrated Radon Mitigation
- Scope: sump pump replacement combined with the radon system tie-in
- Result: measurable radon reduction confirmed by post-install testing
- Best for: homes with active water management needs
All six documented projects, including a historic home with a concealed exhaust route and a 24-hour turnaround install, are on our radon mitigation reviews and project results page.
Radon Mitigation Systems We Have Installed
The System
Which Radon Mitigation Systems Do We Install?
Every house gets the radon mitigation combination it actually needs, not a one-size kit. The foundation decides the method.
Sub-Slab Depressurization (SSD)
The most common radon mitigation system: a suction pipe through the slab and a fan create a vacuum beneath the foundation, drawing radon from the soil and venting it above the roofline. See sub-slab depressurization for what installation day looks like.
Radon Exhaust Fans
A correctly sized inline radon fan keeps negative pressure under the slab 24 hours a day. We install RadonAway fans and handle radon fan replacement when an existing system goes quiet.
Sealing and Caulking of Radon Entry Points
Cracks, floor-to-wall joints and utility penetrations are sealed so the radon system pulls from the soil instead of from the room, which makes the fan more effective and quieter.
Sump-Pit Radon Mitigation
For homes with a sump, we fit or replace an airtight lid and can use the pit as the suction point. Our sump pump radon mitigation guide explains when that is the right design.
Crawl Space Radon Mitigation
Dirt-floor crawl spaces get a sealed vapor barrier with a sub-membrane suction pipe, often paired with crawl space encapsulation to control moisture at the same time.
Radon Monitoring and Radon Alarms
Every radon mitigation system gets a U-tube manometer so you can see the radon fan working. We are an AirThings dealer and can add a continuous radon monitor or radon alarm for homes that want a live radon number.
See the radon mitigation system diagram for how each component fits together, and radon mitigation system installation for the full scope of work. Larger buildings use multi-point designs covered under commercial radon mitigation.
How It Works
How Does a Radon Mitigation Installation Work?
Free In-Home Radon Mitigation Assessment
The radon mitigation assessment is free and in person. We inspect your foundation type, basement, crawl space or slab, review your radon test result, and identify the best suction point and exhaust route for the radon mitigation system.
Custom Radon Mitigation System Design
The radon mitigation system design follows the foundation. Most St. Louis homes get sub-slab depressurization; crawl space homes get a sub-membrane radon system; stone-foundation homes get their own radon mitigation approach. See radon mitigation in older St. Louis homes.
Radon Mitigation System Installation Day
Most single-family radon mitigation system installations are completed in one visit. Radon pipe routing is planned to stay out of sight where the house allows, which is why homeowners keep mentioning clean radon mitigation installs in their reviews.
Post-Install Radon Test and System Adjustment
A post-install radon test confirms your new radon number. If it is not below 4.0 pCi/L we adjust the radon mitigation system at no charge. See post-mitigation radon testing.
Testing
How Is Radon Tested Before and After Mitigation?
Radon mitigation starts and ends with a measurement. Before installation we need a recent radon test result; after installation a second test proves the radon system works.
- Pre-mitigation radon test: a 48-hour continuous radon monitor or a short-term charcoal test in the lowest lived-in level, under closed-house conditions. Our radon testing service covers this, including real estate transactions.
- Post-mitigation radon test: run after the radon system has operated for at least 24 hours, to confirm the reading is below 4.0 pCi/L and set your baseline.
- Long-term radon monitoring: a 90-day or longer test, or a continuous monitor, shows how the radon level moves across seasons. Retest every two years, or after any foundation or HVAC work.
Not sure whether you need radon mitigation yet? Our radon testing vs. mitigation guide explains the order of operations, and radon levels and pCi/L explains what your number means.
The Proof
St. Louis Radon Mitigation Reviews From Google
Verified Google reviews of Air Sense Environmental radon mitigation installs across the St. Louis metro, quoted as published. Homeowners describe the radon mitigation crew, the clean radon system install, and the radon reading afterward.
“Radon mitigation installation was completed in the most professional way. Crew was highly professional / clean installation and actually left my house in better shape than they found it. They took the time to explain the system and installed in most discrete way to minimize any eye sores. Highly recommend this group.”
Curt Griffith, Google review, 15 August 2026
“Jake and his team did an amazing job installing radon remediation and also an April Aire ventilation system. Within a day our radon level was almost undetectable and our CO2 levels were in the green. They came in, did their work, and cleaned up completely. I highly recommend Air Sense Environmental.”
Jeanne Felfe, Google review, 17 August 2026
“Jake was great, respectful, and was able to work around the chaos of a house freshly moved into. The installation was quick, seamless, and gives a great piece of mind for our family.”
Sean O’Connor, Google review, 21 August 2026
“Air Sense was incredibly easy to work with. Jake was friendly, professional, and very efficient with the install. They took the time to explain the installation and answer any questions. Would highly recommend!”
Grace Sturgeon, Google review, 14 July 2026
Read all Air Sense Environmental radon mitigation reviews and project results.
Pricing
What Determines Radon Mitigation Cost in St. Louis?
- Foundation type: slab, basement, crawl space, or a combination
- Home size and whether more than one suction point is needed
- Your starting radon level and the target you want to reach
- Sump pit, sealing and exhaust routing requirements
- Fan size and whether you add a continuous radon monitor
Looking for pricing? See our St. Louis radon mitigation cost guide for current price ranges by system type and every factor that moves the number. Air Sense Environmental provides a free written estimate for your specific house before any radon mitigation work begins.
The Guarantee
Our Radon Mitigation Guarantee
A radon 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 a follow-up radon test confirms your new number.
- If a follow-up reading ever comes back high, we adjust the radon 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 Air Sense for radon mitigation.
- After installation, retest every two years to confirm ongoing performance. Our radon system maintenance page covers what to watch between tests.
Still weighing it? Here is the data on whether radon mitigation really works.
Questions
Radon Mitigation Questions, Answered
How much does radon mitigation cost in St. Louis?
Radon mitigation cost in St. Louis depends on your home’s foundation type, size, and measured radon level, so Air Sense Environmental provides a free written estimate for every house. For current price ranges by system type and a full 2026 pricing breakdown, see our St. Louis radon mitigation cost guide.
How long does a radon mitigation system installation take?
Most radon mitigation systems are installed in a single day for a standard home. You can usually return to normal activity the same day.
What type of radon mitigation system do you install?
The most common system we install is sub-slab depressurization (SSD), which draws radon from beneath your foundation and vents it safely outside through a PVC pipe and fan system. The right approach depends on your home’s foundation, basement, crawl space, or slab-on-grade. We assess this during the free estimate.
What happens if my radon levels are still high after mitigation?
If a follow-up test shows levels are still at or above 4 pCi/L, we assess the system and make the necessary adjustments, which may include upgrading the fan, adding a second suction point, or sealing foundation entry points. Air Sense Environmental stands behind every installation.
Where We Work
Where Does Air Sense Perform Radon Mitigation?
Radon mitigation from Air Sense Environmental covers the Greater St. Louis bi-state metro from our Edwardsville, Illinois headquarters. Our crews are in Missouri and Illinois every week.
Radon Mitigation in Missouri
St. Louis City, St. Louis County and St. Charles County, including Chesterfield, Florissant, Kirkwood, Maryland Heights, St. Peters, O’Fallon, St. Charles, Wentzville, and surrounding areas.
Radon Mitigation in Illinois
Edwardsville, Glen Carbon, Alton, Belleville, Bethalto, Collinsville, Godfrey, Granite City, Highland, Maryville, Troy, Fairview Heights, O’Fallon, Swansea, Brighton, Elsah, Jerseyville, and surrounding communities. Illinois-side detail is on our Metro East radon mitigation page.
Cities We Serve for Radon Mitigation
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High radon test? Book a radon mitigation estimate today.
Free in-home radon mitigation estimate, a custom-designed radon mitigation system, and 24-hour availability across the St. Louis metro.
Related
More Radon Mitigation Services
Different situations call for different radon mitigation work. These pages cover the ones we are asked about most.
- Sub-Slab Depressurization: how the system works and what installation day looks like.
- Radon Fan Replacement: when an existing system goes quiet or the manometer levels out.
- Radon System Maintenance: what to check between tests and when to call.
- Metro East Radon Mitigation: Illinois-side service from our Edwardsville headquarters.
- Commercial Radon Mitigation: multi-point systems for larger buildings.