What EPA's radon map says about Caswell County

Caswell County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally that's the 47th percentile for radon potential — Caswell County outranks 47% of every county EPA has rated.

Where Caswell County sits nationally

About 22,363 people live in Caswell County, North Carolina, spread over 425.501 square miles. Averaged across its land area, Caswell County runs about 53 people per square mile. Among counties sharing Caswell County's EPA zone, it outranks 43% of them by population. Caswell County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Caswell County

Caswell County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Caswell County — testing is the only way to know an individual home's actual level.

Next steps for a home in Caswell County

Mitigation cost doesn't depend on Caswell 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

Caswell County's test kit answers today; a Airthings radon monitor keeps answering for Caswell 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 Caswell County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.