What EPA's radon map says about Chilton County

EPA places Chilton County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Chilton County in the 55th percentile nationally for radon potential — higher than 55% of the counties EPA has rated.

Chilton County by the numbers

About 47,262 people live in Chilton County, Alabama, spread over 692.838 square miles. Averaged across its land area, Chilton County runs about 68 people per square mile. Among counties sharing Chilton County's EPA zone, it outranks 66% of them by population. Geologically, Chilton County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Zone vs. an actual test

Chilton County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Nothing about a Zone 2 label lowers the case for testing in Chilton County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Chilton County

Mitigation cost doesn't depend on Chilton 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

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

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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.