What EPA's radon map says about Lenoir County

EPA's own radon map rates Lenoir County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Lenoir County sits at the 23rd percentile nationally for radon potential — above 23 of every 100 rated counties.

Lenoir County by the numbers

About 55,332 people live in Lenoir County, North Carolina, spread over 399.087 square miles. Population density there runs about 139 people per square mile. Among counties sharing Lenoir County's EPA zone, it outranks 69% of them by population. EPA's geology-based Region 4 groups Lenoir County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Lenoir County

A Zone 3 county like Lenoir County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Lenoir County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Lenoir County

Mitigation cost doesn't depend on Lenoir 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 North Carolina's state radon program

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

The methodology guide shows exactly which EPA and Census sources feed Lenoir County's numbers. Whatever zone Lenoir County carries, the zone explainer covers what it does and doesn't tell you about any one house.