Is Hanover County, VA a radon risk area?

Hanover County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Hanover County ranks higher in radon potential than 27% of rated counties (the 27th percentile).

How Hanover County compares

About 115,309 people live in Hanover County, Virginia, spread over 467.61 square miles. Averaged across its land area, Hanover County runs about 247 people per square mile. Rank 200 by population within its EPA zone puts Hanover County at the 81st percentile among zone peers. EPA's geology-based Region 3 groups Hanover County with 244 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Hanover County

Hanover 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. A Zone 3 rating means Hanover 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.

Next steps for a home in Hanover County

Nothing about Hanover 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

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