Glen Ellyn is a DuPage County suburb served by Metra’s Union Pacific West Line, known for its historic homes clustered near the downtown train station. Construction era doesn’t reduce radon risk here — the same glacial till and dolomite bedrock underlies the entire area, and radon enters through foundation cracks, sump pits, and crawl spaces either way.
Radon in Glen Ellyn, IL — Risk, Testing & Top Monitors
Glen Ellyn is one of DuPage County’s most sought-after suburbs — and its homes face the same elevated radon risk as the rest of the county. The average indoor radon level in DuPage County exceeds the EPA action level, and an estimated 30–40% of homes test above 4 pCi/L. Illinois law requires radon disclosure in every home sale. Testing is the only way to know your home’s actual radon level — here’s how to pick the right kit or monitor.
Why Glen Ellyn Has Elevated Radon Risk
Glen Ellyn is located in DuPage County, Illinois — where the average indoor radon level is approximately 4.3 pCi/L, exceeding the EPA’s recommended action level of 4 pCi/L. An estimated 30 to 40 percent of homes tested in DuPage County return results above the action threshold.
The glacial till deposits and dolomite limestone bedrock beneath Glen Ellyn create natural pathways for radon gas to migrate into home foundations. The village’s housing stock — ranging from classic 1920s–1950s homes to newer construction — nearly all include full basements, which are the primary accumulation points for radon gas.
Glen Ellyn’s real estate market is among the most competitive in the western suburbs. Median single-family home prices range from $495,000 to $625,000 with 9.6% year-over-year appreciation. Nearly half of homes sell above asking price, and 85% sell within 30 days. In this environment, radon testing is standard in every transaction — and elevated results are common.
Radon causes approximately 21,000 lung cancer deaths annually in the United States according to the EPA — making it the leading cause of lung cancer among non-smokers. Testing is the only way to know your home’s radon level.
What Illinois Law Requires for Radon
Under the Illinois Radon Awareness Act (420 ILCS 46), every home seller must provide buyers with the IEMA radon pamphlet and a signed Disclosure of Information on Radon Hazards form. Sellers must disclose any known test results and provide copies of test records.
In Glen Ellyn’s competitive market, radon testing is a standard part of virtually every home inspection. When results come back elevated — which happens in 30–40% of DuPage County homes — mitigation is typically completed before closing.
As of January 2024, Illinois also requires radon disclosure for most residential leases. All radon professionals must hold an active IEMA license under the Radon Industry Licensing Act (420 ILCS 44), with penalties up to $5,000 for unlicensed work.
How Radon Mitigation Works in Glen Ellyn Homes
The standard method is sub-slab depressurization (SSD). A licensed contractor drills through the basement slab, installs PVC piping from below the slab to above the roofline, and attaches a continuously running fan. This creates negative pressure beneath the foundation, pulling radon out before it enters the living space.
For Glen Ellyn’s older homes — many of which have block or stone foundations — contractors may need to seal additional entry points and potentially use block wall suction techniques alongside standard SSD. Newer homes built after 2013 include passive radon-resistant features per Illinois law, but frequently need active fan upgrades when post-construction tests show elevated levels.
Most installations are completed in 4–8 hours. The system runs continuously and quietly. A follow-up test confirms levels have dropped below 4 pCi/L. For more details, see our complete radon mitigation guide.
Radon Mitigation Cost in Glen Ellyn, IL
The typical cost for a standard sub-slab system in Glen Ellyn ranges from $1,100 to $2,000. The Chicago metro average is approximately $1,300–$1,500.
Older homes with block foundations, finished basements, or complex layouts may require additional work, pushing costs to $2,000–$2,500. For a detailed breakdown, see our radon mitigation cost guide.
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Frequently Asked Questions
DuPage County’s average indoor radon level is approximately 4.3 pCi/L — above the EPA action level. An estimated 30–40% of homes tested exceed 4 pCi/L.
Illinois law requires disclosure forms and any known test results. In Glen Ellyn’s competitive market, radon testing is standard in every transaction.
Most installations are completed in a single day, typically 4–8 hours.
The typical range is $1,100–$2,000. Older homes with block foundations may cost $2,000–$2,500.
Yes. All radon professionals in Illinois must hold an active IEMA license. Penalties for unlicensed work are up to $5,000 per offense.
Absolutely. Glen Ellyn home values have appreciated 9.6% year-over-year. Radon is easily mitigated for $1,100–$2,000, and having a system installed is a selling point in future transactions.
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RadonSafetyGuide.com is an independent resource. We are not a radon mitigation company. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you. All services are performed by independent, licensed contractors. Illinois radon contractors must hold an active IEMA license.