What EPA's radon map says about Anson County

EPA places Anson County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Anson County ranks higher in radon potential than 15% of rated counties (the 15th percentile).

Anson County by the numbers

About 22,432 people live in Anson County, North Carolina, spread over 531.467 square miles. Averaged across its land area, Anson County runs about 42 people per square mile. Among counties sharing Anson County's EPA zone, it outranks 45% of them by population. EPA's geology-based Region 4 groups Anson County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Anson County

At Zone 3, Anson County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Anson County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Anson County

Mitigation cost doesn't depend on Anson 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

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

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.