Is Lee County, SC 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. Rank it against the rest of the country and Lee County lands in the 11th percentile for radon potential.

Where Lee County sits nationally

About 15,958 people live in Lee County, South Carolina, spread over 410.187 square miles. Population density there runs about 39 people per square mile. Rank 694 by population within its EPA zone puts Lee County at the 33rd 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.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Lee County's Zone 3 prediction is the low end of the scale. 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.

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 South Carolina'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

Lee County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.