Is Gloucester County, VA a radon risk area?

EPA's own radon map rates Gloucester County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Gloucester County lands in the 20th percentile for radon potential.

How Gloucester County compares

About 40,154 people live in Gloucester County, Virginia, spread over 217.815 square miles. Averaged across its land area, Gloucester County runs about 184 people per square mile. Rank 403 by population within its EPA zone puts Gloucester County at the 61st percentile among zone peers. Geologically, Gloucester County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Gloucester County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Gloucester County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Gloucester County

Nothing about Gloucester County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Virginia's state radon program

Gloucester County's test kit answers today; a Airthings radon monitor keeps answering for Gloucester County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Gloucester County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.