What EPA's radon map says about Surry County

EPA's own radon map rates Surry County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Surry County in the 4th percentile nationally for radon potential — higher than 4% of the counties EPA has rated.

Surry County by the numbers

About 6,579 people live in Surry County, Virginia, spread over 278.949 square miles. Population density there runs about 24 people per square mile. Among counties sharing Surry County's EPA zone, it outranks 12% of them by population. Surry County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

At Zone 3, Surry 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. A Zone 3 rating means Surry County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

If Surry County tests above the action level

Mitigation cost doesn't depend on Surry 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 Virginia's state radon program

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

Surry County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.