What Naperville Homeowners Should Do After a High Radon Test

Your radon test came back elevated. If you are in the Naperville area, you are not alone — DuPage County consistently shows above-average radon levels, and elevated results come up regularly throughout the region.

What Elevated Means

The EPA action level is 4.0 pCi/L. If your test result came back at or above that number, the standard recommendation is mitigation.

Elevated radon is not an emergency. You do not need to stop using the basement or vacate the house. Radon is a longer-term concern, and a properly installed mitigation system resolves it reliably. Getting a quote from a licensed mitigation professional is a reasonable next step.

Why Naperville Area Homes Test Elevated

DuPage County soil composition and the prevalence of full-basement homes both contribute to elevated readings throughout the area. Finished basements can accumulate more radon because the space is sealed tighter and used more regularly — but elevated results show up in unfinished basements too.

If you live in Aurora, Warrenville, Lisle, or Bolingbrook, the same general context applies. Elevated readings turn up throughout the county, not just in certain neighborhoods.

The Fix

The standard approach is sub-slab depressurization: a pipe and fan system that draws radon from under the foundation and vents it outside before it can enter the living space. It is installed in one visit, runs continuously and quietly, and most homeowners do not think about it again once it is in.

Most installs in the Naperville area are done in a single day. After the system is running, radon levels drop within 24 to 48 hours.

If You Are Buying or Selling

Elevated radon findings come up regularly in DuPage County home inspections. If you are under contract and need mitigation completed before closing, call early in the process. Most of the time we can schedule and deliver documentation before the deadline — but earlier is easier.

More on the real estate side: buying a home with elevated radon and selling your home when radon comes up.

ARS in the Naperville Area

American Radon Systems serves Naperville, Aurora, Warrenville, Lisle, Bolingbrook, and the surrounding DuPage County communities. We are familiar with the construction styles and foundation types common in this market.

More about ARS service in the Naperville area →