Rockcastle County, KY: EPA's radon zone, explained

EPA's own radon map rates Rockcastle County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Rockcastle County lands in the 44th percentile for radon potential.

Where Rockcastle County sits nationally

Rockcastle County, Kentucky is home to about 16,226 people across 316.567 square miles. Averaged across its land area, Rockcastle County runs about 51 people per square mile. By population, Rockcastle County is the 688th largest of every county sharing its EPA zone — the 33rd percentile by population within that zone. Geologically, Rockcastle 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 Rockcastle County

Rockcastle County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Middle-of-the-pack doesn't mean risk-free for any one Rockcastle County address — a moderate county average still leaves individual homes to test either side of it.

If Rockcastle County tests above the action level

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

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