What EPA's radon map says about Lee County

EPA places Lee County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Lee County in the 12th percentile nationally for radon potential — higher than 12% of the counties EPA has rated.

How Lee County compares

About 18,451 people live in Lee County, Texas, spread over 629.058 square miles. Averaged across its land area, Lee County runs about 29 people per square mile. Among counties sharing Lee County's EPA zone, it outranks 37% of them by population. Lee County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

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. A Zone 3 rating means Lee County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

If Lee County tests above the action level

Mitigation cost doesn't depend on Lee County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Texas'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.