Powell County, KY: EPA's radon zone, explained
EPA places Powell 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. Rank it against the rest of the country and Powell County lands in the 42nd percentile for radon potential.
Where Powell County sits nationally
Powell County, Kentucky is home to about 12,928 people across 178.962 square miles. Averaged across its land area, Powell County runs about 72 people per square mile. By population, Powell County is the 760th largest of every county sharing its EPA zone — the 26th percentile by population within that zone. Powell County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.
Why the zone isn't the answer by itself
Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Powell County's Zone 2 prediction lands in the gap between the two. Middle-of-the-pack doesn't mean risk-free for any one Powell County address — a moderate county average still leaves individual homes to test either side of it.
If Powell County tests above the action level
For a Powell 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 Kentucky's state radon program
For Powell County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Powell 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 Powell County's figures come from
Powell County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.