Is Robertson County, KY a radon risk area?

EPA's own radon map rates Robertson County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Robertson County sits at the 68th percentile nationally for radon potential — above 68 of every 100 rated counties.

How Robertson County compares

About 2,382 people live in Robertson County, Kentucky, spread over 99.591 square miles. That works out to roughly 24 people per square mile. Rank 1010 by population within its EPA zone puts Robertson County at the 5th percentile among zone peers. Geologically, Robertson County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Zone vs. an actual test

Where the national indoor average runs about 1.3 pCi/L, Robertson County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. That doesn't mean every Robertson County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Next steps for a home in Robertson County

Nothing about Robertson 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

Robertson County's test kit answers today; a Airthings radon monitor keeps answering for Robertson 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

The methodology guide shows exactly which EPA and Census sources feed Robertson County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.