Limestone County, AL Radon Zone Data

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

Limestone County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Limestone County lands in the 95th percentile for radon potential.

Where Limestone County sits nationally

Limestone County, Alabama is home to about 118,942 people across 563.398 square miles. Population density there runs about 211 people per square mile. By population, Limestone County is the 165th largest of every county sharing its EPA zone — the 85th percentile by population within that zone. Geologically, Limestone 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 Limestone County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Being in Zone 1 raises the odds Limestone 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.

Testing and mitigation in Limestone County

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

Where Limestone County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Limestone County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.