St. Louis Radon Reviews & Project Results

St. Louis Radon Mitigation Reviews & Project Results

Real St. Louis homeowners. Real radon reductions. Backed by 135+ five-star Google reviews and a portfolio of installs that have taken homes from dangerous radon levels to well below the EPA action threshold of 4.0 pCi/L.

Credentials & Certifications

Owner Jake is NRPP-certified and fully insured, and Air Sense Environmental holds Illinois IEMA license #RNM20232346. We’re an A-rated, BBB-accredited business and active members of HomeAdvisor, the Institute of Environmental Management and Assessment, the Southwestern Illinois Board of Realtors, and the St. Louis Association of Realtors.

• NRPP-certified radon mitigation professional
• IEMA Licensed, #RNM20232346
• BBB Accredited, A rating
• Fully insured for residential and commercial work
• Active member: HomeAdvisor, IEMA, SW Illinois Board of Realtors, St. Louis Association of Realtors

What St. Louis Homeowners Say

Every review below is verified on Google. Names and dates are quoted as published.

Read All 135+ Google Reviews

Project Results: Before & After

The EPA action threshold for radon is 4.0 pCi/L. Below are real reductions Air Sense Environmental has delivered for St. Louis-area homeowners.

Project 1: High-Level Basement Mitigation

• Before: 12–14 pCi/L (3–4× the EPA action level)
• After: 0.1–0.4 pCi/L
• Reduction: ~97–99%
• System: Sub-slab depressurization with monitored exhaust fan

Project 2: Severe Radon Reduction

• Before: 30+ pCi/L (7× the EPA action level)
• After: Less than 1 pCi/L
• Reduction: 96%+
• System: Engineered SSD with sealed entry points and high-flow fan

Project 3: Two-Zone Whole-Home Mitigation

• Before: 4 pCi/L (upstairs) and 10 pCi/L (basement)
• After: Both zones below 2 pCi/L
• System: Multi-point depressurization with balanced exhaust

Project 4: 24-Hour Turnaround

• Result: Radon levels reduced to an insignificant value within 24 hours of system commissioning
• System: Standard SSD with same-day post-install testing

Project 5: Sump-Pump-Integrated Mitigation

• Scope: Sump pump replacement combined with radon system tie-in
• Result: Measurable radon reduction confirmed by post-install testing
• Note: Sump-integrated mitigation is ideal for homes with active water management needs

Project 6: Historic Home Preservation

• Challenge: Preserve aesthetic and structural integrity of a historic property
• Solution: Custom-routed exhaust path with concealed components
• Result: Radon levels significantly reduced with no impact on the home’s appearance

Where We Work

Air Sense Environmental serves the greater St. Louis metro across both sides of the Mississippi, including:

Missouri

• St. Louis City & County
• St. Charles County
• Jefferson County
• Franklin County
• Webster Groves, Clayton, Brentwood, Maplewood
• Wildwood, Florissant, University City
• Richmond Heights, St. Peters, Arnold

Illinois

• Madison County
• St. Clair County
• Godfrey, Maryville, Jerseyville
• Brighton, Elsah

Ready to See Your Own Radon Numbers Drop?

If your home tested above 4.0 pCi/L, or you’d like to find out where your levels stand, we’ll give you a straight answer, a fair quote, and a system designed for your home. Most installs are completed in a single visit.