What EPA's radon map says about Lauderdale County

EPA places Lauderdale 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. That puts Lauderdale County in the 94th percentile nationally for radon potential — higher than 94% of the counties EPA has rated.

How Lauderdale County compares

About 97,502 people live in Lauderdale County, Alabama, spread over 668.049 square miles. Averaged across its land area, Lauderdale County runs about 146 people per square mile. Among counties sharing Lauderdale County's EPA zone, it outranks 81% of them by population. Lauderdale County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Lauderdale County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Lauderdale County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Being in Zone 1 raises the odds Lauderdale County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Lauderdale County tests above the action level

Mitigation cost doesn't depend on Lauderdale 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

Lauderdale County's test kit answers today; a Airthings radon monitor keeps answering for Lauderdale 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

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