Washington County, AL radon potential

EPA's own radon map rates Washington County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Washington County in the 10th percentile nationally for radon potential — higher than 10% of the counties EPA has rated.

Where Washington County sits nationally

Washington County, Alabama is home to about 15,018 people across 1,080.255 square miles. That works out to roughly 14 people per square mile. Within its own EPA zone, Washington County is bigger by population than 31% of the counties that share it. Washington County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Washington 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. Don't read Zone 3 as a pass for Washington County — EPA's guidance to test every home makes no exception for counties predicted low.

If Washington County tests above the action level

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Alabama's state radon program

For Washington County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Washington 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 Washington 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.