Is Washington County, KY a radon risk area?

EPA's own radon map rates Washington County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Washington County ranks higher in radon potential than 41% of rated counties (the 41st percentile).

Washington County by the numbers

About 12,269 people live in Washington County, Kentucky, spread over 297.286 square miles. Averaged across its land area, Washington County runs about 41 people per square mile. Rank 779 by population within its EPA zone puts Washington County at the 25th percentile among zone peers. EPA's geology-based Region 4 groups Washington County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Washington County

EPA's Zone 2 rating for Washington County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Washington County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Washington County

Nothing about Washington County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Kentucky's state radon program

Washington County's test kit answers today; a Airthings radon monitor keeps answering for Washington County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

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