Sumter County, AL radon potential

EPA places Sumter 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. Nationally, Sumter County ranks higher in radon potential than 41% of rated counties (the 41st percentile).

Where Sumter County sits nationally

Sumter County, Alabama is home to about 11,607 people across 903.826 square miles. Population density there runs about 13 people per square mile. Within its own EPA zone, Sumter County is bigger by population than 23% of the counties that share it. Geologically, Sumter County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Sumter County

Sumter County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Middle-of-the-pack doesn't mean risk-free for any one Sumter County address — a moderate county average still leaves individual homes to test either side of it.

If Sumter County tests above the action level

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Alabama's state radon program

For Sumter County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Sumter 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 Sumter County's figures come from

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