Is Lee County, FL a radon risk area?

Lee County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 32nd percentile for radon potential — Lee County outranks 32% of every county EPA has rated.

Where Lee County sits nationally

About 860,959 people live in Lee County, Florida, spread over 781.182 square miles. Population density there runs about 1,102 people per square mile. Rank 36 by population within its EPA zone puts Lee County at the 97th percentile among zone peers. EPA's geology-based Region 4 groups Lee County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Lee County

A Zone 3 county like Lee County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Lee County — EPA's guidance to test every home makes no exception for counties predicted low.

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 Florida'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. RADONZONE-10OFF at checkout knocks 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. Whatever zone Lee County carries, the zone explainer covers what it does and doesn't tell you about any one house.