What EPA's radon map says about Kankakee County

EPA places Kankakee County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Kankakee County sits at the 60th percentile nationally for radon potential — above 60 of every 100 rated counties.

Where Kankakee County sits nationally

About 106,410 people live in Kankakee County, Illinois, spread over 676.49 square miles. That works out to roughly 157 people per square mile. Among counties sharing Kankakee County's EPA zone, it outranks 82% of them by population. Geologically, Kankakee County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

What this actually means for a house in Kankakee County

Kankakee County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Kankakee County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Next steps for a home in Kankakee County

Mitigation cost doesn't depend on Kankakee County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Illinois's state radon program

Kankakee County's test kit answers today; a Airthings radon monitor keeps answering for Kankakee County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Kankakee County's numbers. Whatever zone Kankakee County carries, the zone explainer covers what it does and doesn't tell you about any one house.