What EPA's radon map says about Lawrence County

EPA places Lawrence County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 86th percentile for radon potential — Lawrence County outranks 86% of every county EPA has rated.

Lawrence County by the numbers

About 33,567 people live in Lawrence County, Alabama, spread over 690.685 square miles. That works out to roughly 49 people per square mile. Among counties sharing Lawrence County's EPA zone, it outranks 59% of them by population. EPA's geology-based Region 4 groups Lawrence County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Lawrence County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Some Lawrence County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

If Lawrence County tests above the action level

Mitigation cost doesn't depend on Lawrence 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

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Lawrence County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.