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County radon rundown

Radon in Kendall County, IL

EPA ZONE1
Highest radon potentialEPA predicts an average indoor screening level above 4 pCi/L, the action level, for Zone 1 counties. That's an average across the county, not your home: some homes test lower, and some much higher.
Source: EPA Map of Radon Zones

Where Zone 1 sits on the radon scale

Test your home

A county zone can't tell you what's in your house. Neighbors can have very different readings, so testing is the only way to know.

Short-term test kitCharcoal kit, 2 to 7 days in your lowest lived-in room, then mailed to a lab.
[affiliate slot: test kit]
Long-term test kit90+ days, a better picture of your year-round average.
[affiliate slot: long-term kit]
Digital radon monitorPlug-in or battery monitor that shows levels continuously.
[affiliate slot: monitor, e.g. Airthings]

What to do with your result

  1. Below 2 pCi/L: retest every couple of years or after renovations.
  2. 2 to 4 pCi/L: EPA says consider fixing your home.
  3. 4 pCi/L or higher: EPA recommends fixing your home. Confirm with a second test, then contact a certified radon mitigation professional. A typical fix is a sub-slab vent fan system.
  4. On a private well? Consider testing your well water for radon too.

Source: EPA A Citizen's Guide to Radon.

Radon in the news

Illinois stories

Headlines link to the original publishers via Google News. Updated 2026-10-27.

Nearby counties

All Illinois counties

Sources