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

EPA places Henry 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. That puts Henry County in the 12th percentile nationally for radon potential — higher than 12% of the counties EPA has rated.

Henry County by the numbers

Henry County, Alabama is home to about 18,141 people across 561.927 square miles. Population density there runs about 32 people per square mile. By population, Henry County is the 662nd largest of every county sharing its EPA zone — the 36th percentile by population within that zone. Henry County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Henry County

Henry County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 rating means Henry 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.

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 Alabama'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

Henry County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Henry County carries, the zone explainer covers what it does and doesn't tell you about any one house.