Is White County, IL a radon risk area?

EPA places White 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. That puts White County in the 42nd percentile nationally for radon potential — higher than 42% of the counties EPA has rated.

Where White County sits nationally

About 13,395 people live in White County, Illinois, spread over 494.983 square miles. Averaged across its land area, White County runs about 27 people per square mile. Rank 747 by population within its EPA zone puts White County at the 28th percentile among zone peers. Geologically, White 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 White County

White 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. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in White County — testing is the only way to know an individual home's actual level.

Testing and mitigation in White County

Nothing about White 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

White County's test kit answers today; a Airthings radon monitor keeps answering for White 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.