Is Lee County, IA a radon risk area?

EPA's own radon map rates Lee County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 86th percentile for radon potential — Lee County outranks 86% of every county EPA has rated.

Where Lee County sits nationally

About 32,376 people live in Lee County, Iowa, spread over 517.55 square miles. Population density there runs about 63 people per square mile. Rank 449 by population within its EPA zone puts Lee County at the 58th percentile among zone peers. Lee County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Lee County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Some Lee County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Next steps for a home in Lee County

Nothing about Lee 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 Iowa's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Lee County carries, the zone explainer covers what it does and doesn't tell you about any one house.