# Troy, IL

- **URL:** https://airsenseenvironmental.com/service-area/troy-il/
- **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 Media Room About Us Contact Call 314-664-9807 Home › Service Area › Troy, IL Service Area · Troy, IL Radon Testing & Mitigation in Troy, IL In Troy, IL, Air Sense Environmental tests homes for radon, installs radon mitigation systems, tests indoor air quality and encapsulates crawl spaces. Every radon job in Madison County is measured against the EPA action level of 4.0 pCi/L, and the team is NRPP-certified and IEMA-licensed (#RNM20232346). IEMA-Certified NRPP-Certified Free In-Home Estimates Call 314-664-9807 Get a Free Estimate Is radon a problem in Troy, IL? Yes. Madison County is in EPA Radon Zone 2, where the predicted average indoor radon level is 2 to 4 pCi/L, and individual Troy homes routinely test well above the 4.0 pCi/L action level. The Illinois Department of Public Health reports that about 41 percent of Illinois homes tested have come back at or above 4.0 pCi/L, and Illinois requires radon professionals to hold an IEMA license. Troy sits where Interstates 55, 70 and 270 meet, and it has grown fast since the 1990s, so most of its homes are newer construction on poured basements. A Troy neighbor's reading is a signal, not an answer. The soil under one lot, the cracks in one slab and the way one sump pit was sealed decide the number, which is why two similar homes a few doors apart can land on opposite sides of the action level. Radon testing in Troy, IL A Troy radon test runs 48 hours under closed-house conditions on a calibrated continuous monitor, and the report shows the hourly data as well as the average. The St. Louis radon testing page covers how the test works, and the radon testing cost guide holds current pricing. Radon mitigation in Troy, IL When a Troy home tests at or above 4.0 pCi/L, the same team designs and installs the radon mitigation system, usually in a single day, and retests to confirm the home is below the action level. See radon mitigation in Troy for the process, documented results and warranty. Indoor air quality testing in Troy, IL An indoor air quality assessment for a Troy home logs particulate matter, chemical vapors, CO2, CO and humidity at one-minute intervals for 48 hours or more, so the fix is based on data. Details are on the St. Louis indoor air quality testing page. Crawl space encapsulation in Troy, IL For Troy homes with a crawl space, encapsulation lays a sealed vapor barrier over the soil and walls and adds humidity control, keeping damp air and soil gas out of the rooms above. Read more on the St. Louis crawl space encapsulation page. Which Troy homes does Air Sense Environmental work on? The Troy homes the team sees most often: 1990s to 2010s subdivision homes on poured basements Older homes near downtown Troy with block basements Homes with finished lower levels Rural homes on acreage east of town What should Troy homeowners expect? Test first. A 48-hour continuous monitor test gives the number everything else depends on. Read the report together. You get the hourly data and a plain explanation of what it means for the house. Design the fix. If the reading is at or above 4.0 pCi/L, the system is designed around your foundation during a free in-home estimate. Install and verify. Most systems go in within a single day, and a post-mitigation test confirms the result. About Troy, IL Troy is a city in Madison County, Illinois, United States. The population was 10,960 at the 2020 census, up from 9,888 in 2010. Troy is part of the St. Louis Metropolitan Statistical Area. Its namesake in Lincoln County, Missouri, is also part of this MSA, making it (along with the two O'Fallons in Illinois and Missouri) one of the few pairs of like-named municipalities to be part of the same MSA.== History == Troy was platted in 1819. It was incorporated as a town on February 18, 1857, and as a city in 1892.== Geography == Troy is located in south-central Madison County at 38°43′45″N 89°53′30″W (38.729236, -89.891733). It is bordered to the west by Maryville and to the northwest by Glen Carbon. Interstates 55 and 70 pass through the west side of Troy, with access from exits 17 and 18. The highways together lead southwest 20 miles (32 km) to St. Troy neighborhoods and nearby communities Air Sense Environmental works across Troy, IL, including downtown Troy, the subdivisions along Route 162 and the neighborhoods near Tri-Township Park, in ZIP code 62294. Nearby communities with their own service pages: Radon testing and mitigation in Maryville, IL Radon testing and mitigation in Glen Carbon, IL Radon testing and mitigation in Edwardsville, IL Radon testing and mitigation in Highland, IL All Air Sense Environmental service areas From Our Work Explore More From Air Sense Services in Troy, IL Radon Mitigation in Troy, IL Nearby Communities University City, MOValley Park, MOWaterloo, ILWebster Groves, MOWeldon Spring, MOWentzville, MOWildwood, MOAffton, 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 NRPP-Certified · IEMA License #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 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