Serving Naperville & All of Chicagoland

Radon Testing in Naperville, IL

Radon is the second leading cause of lung cancer in the United States - and Illinois is considered a high-risk state. The EPA recommends taking action when radon levels reach 4 pCi/L or higher. Castle Home Inspection uses calibrated continuous electronic radon monitors that run during your home inspection and deliver accurate results within your same-day report. No waiting. No second trip.

Book Inspection + Radon Test Call: (630) 462-1050

How We Test

Accurate Radon Testing, Delivered Same Day

Professional-grade equipment, EPA-aligned protocols, and results that arrive with your full home inspection report.

Continuous Electronic Monitors

We use professional-grade continuous monitors, not passive charcoal canisters. They track radon levels hour-by-hour for the most accurate reading.

Results With Your Report

Radon results are included in your same-day digital inspection report - no waiting days for a lab to process a canister.

Illinois EPA Guidelines

We follow Illinois EPA and EPA national protocols. If levels are at or above 4 pCi/L, we explain what mitigation options look like and estimated costs.

Local Risk

Why Radon Matters in Naperville & DuPage County

Naperville and the broader DuPage County area have elevated radon potential due to the region's glacial geology. Radon is odorless, colorless, and undetectable without testing - it seeps from the ground into homes through foundation cracks, sump pits, and crawl spaces. The only way to know is to test. Castle recommends radon testing on every home purchase, regardless of age or construction type.

The Process

How Radon Testing Works With Castle

Three simple steps - added on to your home inspection or as a standalone service.

Add Radon Testing at Booking

Select radon testing when you schedule your inspection online or by phone.

We Deploy the Monitor

Our inspector places the continuous electronic monitor at the start of your home inspection. It runs for the duration of the inspection period.

Get Results Same Day

Radon results are delivered with your full inspection report, same day.

EPA Action Level: 4 pCi/L. If your test results are at or above this level, we'll explain mitigation options and estimated costs so you can make an informed decision before closing.

Based in Naperville, Serving All of Chicagoland

Radon testing available throughout the greater Chicago suburbs.

Naperville Wheaton Lisle Glen Ellyn Elmhurst Aurora Yorkville Oswego Bolingbrook Downers Grove Plainfield Warrenville

Add Radon Testing to Your Home Inspection

Already scheduling an inspection? Add radon testing at booking. Questions? Call (630) 462-1050.

Book Inspection + Radon Test Call (630) 462-1050