# St. Louis, MO

- **URL:** https://airsenseenvironmental.com/service-area/st-louis-mo/
- **Published:** 2026-07-20

Skip to content Radon Mitigation Services ▾ Radon Testing Commercial Radon Mitigation Commercial Radon Testing Indoor Air Quality Crawl Space Encapsulation Service Area Resources FAQ Blog Podcast Reviews & Projects About Us Contact 314-664-9807 Free Estimate Radon Mitigation Services Radon Testing Commercial Radon Mitigation Commercial Radon Testing Indoor Air Quality Crawl Space Encapsulation Company Service Area Resources FAQ Blog Podcast Reviews & Projects Case Studies Media Room About Us Contact Call 314-664-9807 Home › Service Area › St. Louis, MO Service Area · St Louis, MO Radon Mitigation in St. Louis, MO Air Sense Environmental installs and tests radon mitigation systems across St. Louis, MO, St. Louis County and St. Charles County, from historic brick homes in South City and Webster Groves to newer subdivisions in Chesterfield and Florissant. Every system is designed for the house it goes into, installed under Jacob Lusby's Illinois IEMA Mitigation Professional license RNM20232346, Customers should arrange a separate follow-up test to compare the result with the EPA action level of 4.0 pCi/L. IEMA-Certified Free In-Home Estimates Call 314-664-9807 Get a Free Estimate If a test has already come back high, our radon mitigation service page explains the systems we install, the readings they reach and the guarantee behind them, and our St. Louis radon mitigation cost guide covers what to budget. If you have not tested yet, radon testing in St. Louis is the first step, and it is the only way to know your number. How We Mitigate Radon in St. Louis Homes Most St. Louis homes get an active sub-slab depressurization system: a suction pit cored through the basement floor, a sealed riser, and a continuously running fan that exhausts soil gas above the roofline. Block-wall foundations common in older city neighborhoods may need wall suction as well, and crawl space homes are encapsulated first so the fan has something to pull against. A pressure field test during the free estimate tells us how many suction points the slab needs, which is what sets the price. Air Sense Environmental recommends arranging a separate follow-up radon test after installation. Confirm the testing provider, timing and price in the written estimate. If the result remains at or above 4.0 pCi/L, contact us for a system assessment; any covered work depends on the written service agreement. Radon Testing in St. Louis, MO The first step in protecting your home is accurate testing. We use advanced equipment to assess radon levels, providing clear, actionable insights. Whether you’re moving into a new house or safeguarding your current one, radon testing in St. Louis, MO, is crucial. Indoor Air Quality in St. Louis, MO Radon is not the only thing worth measuring. Our indoor air quality test tracks particulates, VOCs, carbon dioxide, carbon monoxide and humidity for 48 hours and ends in a written report, so you know what is in your St. Louis home's air and what to fix. Crawl Space Encapsulation in St. Louis, MO A sealed crawl space can significantly reduce radon levels and other airborne dangers. Our encapsulation services protect your home’s foundation, enhancing air quality while providing excellent energy efficiency benefits. St. Louis Radon Mitigation Results Each project below is a real St. Louis area home, with the radon reading before the system went in and the reading from the post-install test. The EPA action level is 4.0 pCi/L. High-level basement mitigation. Before: 12 to 14 pCi/L, three to four times the EPA action level. After: 0.1 to 0.4 pCi/L. Sub-slab depressurization with a monitored exhaust fan. Severe reduction from 30+ pCi/L. Before: more than 30 pCi/L. After: under 1 pCi/L. Engineered sub-slab depressurization with sealed entry points and a high-flow fan. Two-zone whole-home mitigation. Before: 4 pCi/L upstairs and 10 pCi/L in the basement. After: both zones below 2 pCi/L. Multi-point depressurization with balanced exhaust. Sump-pump-integrated mitigation. Sump pump replacement combined with the radon system tie-in, with the reduction confirmed by post-install testing. All six documented projects are on our reviews and project results page. Where We Work in St. Louis Our crews are on the Missouri side every week. In St. Louis City that means South City, Tower Grove, Soulard and the Central West End. In St. Louis County it includes Kirkwood, Webster Groves, Clayton, University City, Maplewood, Brentwood, Richmond Heights, Des Peres, Creve Coeur, Chesterfield, Ballwin, Ellisville, Wildwood, Maryland Heights, Hazelwood, Florissant, Affton, Oakville and Fenton. In St. Charles County we cover St. Charles, St. Peters, O'Fallon, Wentzville and Weldon Spring, and in Jefferson County, Arnold and Festus. Each community has its own page under our service area, and the Illinois side of the metro is covered from our Edwardsville headquarters. Think your home needs a radon check? Free in-home estimates, 24-hour availability. Call 314-664-9807 Other Areas We Serve Air Sense Environmental is committed to protecting communities through thorough radon testing and reliable mitigation solutions. We proudly serve the following areas: St. Charles, MO St. Peters, MO Florissant, MO University City, MO Wildwood, MO Maryland Heights, MO Kirkwood, MO From Our Work Explore More From Air Sense Services in St. Louis, MO Crawl Space Encapsulation in St. Louis, MOIndoor Air Quality in St. Louis, MORadon Mitigation in St. Louis, MORadon Testing in St. Louis, MO Nearby Communities St. Peters, MOSwansea, ILTroy, ILUniversity City, MOValley Park, MOWaterloo, ILWebster Groves, MOWeldon Spring, MO Learn More Radon Mitigation in St. Louis, MORadon TestingAll Service AreasGet a Free Estimate Get Your Number Radon under control. Air you can trust. Free in-home estimate, custom-designed system, 24-hour availability. Call 314-664-9807 5237 Old Alton Edwardsville Rd Edwardsville, IL 62025 314-664-9807 · Open 24 hours Jacob Lusby · Illinois IEMA RNM20232346 Services Radon Mitigation Radon Testing Commercial Radon Commercial Radon Testing Radon Fan Replacement Sub-Slab Depressurization Indoor Air Quality Crawl Space Encapsulation Company About Us Service Area Reviews & Projects Case Studies FAQ Blog Podcast Resources Media Room Contact © 2026 Air Sense Environmental. All rights reserved. Radon Mitigation & Testing · St. Louis, MO & Metro East, IL Call 314-664-9807 Free Estimate