What EPA's radon map says about Warren County

EPA's own radon map rates Warren County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 45th percentile for radon potential — Warren County outranks 45% of every county EPA has rated.

Warren County by the numbers

About 19,081 people live in Warren County, North Carolina, spread over 429.392 square miles. Averaged across its land area, Warren County runs about 44 people per square mile. Among counties sharing Warren County's EPA zone, it outranks 38% of them by population. EPA's geology-based Region 4 groups Warren County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Warren County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A county-wide moderate average, like Warren County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Warren County tests above the action level

Mitigation cost doesn't depend on Warren 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.