Gallia County, OH: EPA's radon zone, explained

EPA's own radon map rates Gallia County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Gallia County ranks higher in radon potential than 50% of rated counties (the 50th percentile).

Gallia County by the numbers

Gallia County, Ohio is home to about 28,886 people across 466.53 square miles. Population density there runs about 62 people per square mile. By population, Gallia County is the 496th largest of every county sharing its EPA zone — the 52nd percentile by population within that zone. Gallia County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Gallia County's Zone 2 prediction lands in the gap between the two. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Gallia County — testing is the only way to know an individual home's actual level.

If Gallia County tests above the action level

For a Gallia 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 Ohio's state radon program

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

Where Gallia County's figures come from

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