McDuffie County, GA: EPA's radon zone, explained

EPA places McDuffie County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 14th percentile for radon potential — McDuffie County outranks 14% of every county EPA has rated.

McDuffie County by the numbers

McDuffie County, Georgia is home to about 21,764 people across 257.379 square miles. Averaged across its land area, McDuffie County runs about 85 people per square mile. By population, McDuffie County is the 584th largest of every county sharing its EPA zone — the 43rd percentile by population within that zone. EPA's geology-based Region 4 groups McDuffie County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

McDuffie County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Even at Zone 3, McDuffie County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If McDuffie County tests above the action level

For a McDuffie 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 Georgia's state radon program

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

Where McDuffie County's figures come from

McDuffie County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone McDuffie County carries, the zone explainer covers what it does and doesn't tell you about any one house.