What EPA's radon map says about Clay County

EPA's own radon map rates Clay 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 Clay County lands in the 78th percentile for radon potential.

Clay County by the numbers

About 14,239 people live in Clay County, Alabama, spread over 603.962 square miles. Averaged across its land area, Clay County runs about 24 people per square mile. Among counties sharing Clay County's EPA zone, it outranks 36% of them by population. Geologically, Clay County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Clay County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. 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 Clay County specifically.

Testing and mitigation in Clay County

Mitigation cost doesn't depend on Clay County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Alabama's state radon program

Clay County's test kit answers today; a Airthings radon monitor keeps answering for Clay County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Clay County carries, the zone explainer covers what it does and doesn't tell you about any one house.