Is Livingston County, IL a radon risk area?

EPA places Livingston County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Livingston County in the 86th percentile nationally for radon potential — higher than 86% of the counties EPA has rated.

Where Livingston County sits nationally

About 35,375 people live in Livingston County, Illinois, spread over 1,043.628 square miles. That works out to roughly 34 people per square mile. Rank 424 by population within its EPA zone puts Livingston County at the 60th percentile among zone peers. Livingston County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Livingston County

Livingston County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. Being in Zone 1 raises the odds Livingston County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Testing and mitigation in Livingston County

Nothing about Livingston County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Illinois's state radon program

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

More on how this number was built

Livingston County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.