What EPA's radon map says about Lebanon County

Lebanon County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Lebanon County lands in the 96th percentile for radon potential.

Lebanon County by the numbers

About 145,319 people live in Lebanon County, Pennsylvania, spread over 361.835 square miles. That works out to roughly 402 people per square mile. Among counties sharing Lebanon County's EPA zone, it outranks 87% of them by population. Geologically, Lebanon County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

What this actually means for a house in Lebanon County

Where the national indoor average runs about 1.3 pCi/L, Lebanon County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Lebanon County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Lebanon County tests above the action level

Mitigation cost doesn't depend on Lebanon 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 Pennsylvania's state radon program

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

The methodology guide shows exactly which EPA and Census sources feed Lebanon County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.