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

EPA places Dale 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 Dale County in the 22nd percentile nationally for radon potential — higher than 22% of the counties EPA has rated.

How Dale County compares

Dale County, Alabama is home to about 50,067 people across 561.113 square miles. Averaged across its land area, Dale County runs about 89 people per square mile. By population, Dale County is the 345th largest of every county sharing its EPA zone — the 67th percentile by population within that zone. EPA's geology-based Region 4 groups Dale County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

A Zone 3 county like Dale County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Dale County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Dale County

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

Where Dale County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Dale County's numbers. Whatever zone Dale County carries, the zone explainer covers what it does and doesn't tell you about any one house.