Henry County, VA: EPA's radon zone, explained

EPA's own radon map rates Henry County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Henry County lands in the 90th percentile for radon potential.

Henry County by the numbers

Henry County, Virginia is home to about 49,385 people across 382.351 square miles. Population density there runs about 129 people per square mile. By population, Henry County is the 316th largest of every county sharing its EPA zone — the 70th percentile by population within that zone. Geologically, Henry 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

Henry County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Henry County specifically.

Testing and mitigation in Henry County

For a Henry County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Virginia's state radon program

For Henry County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Henry County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Henry County's figures come from

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.