Free tool · Kentucky · EPA data
Check your Kentucky ZIP code's EPA radon zone
Type any Kentucky ZIP code. You get the county, the EPA radon zone for that county, what that zone predicts for indoor radon, and typical local mitigation prices. A zone is a county-level screening map, not a reading for your house: only a test tells you your home's level.
Data updated 2026-10-21
Kentucky Radon Risk by ZIP Code (EPA Zone Check)
30
Kentucky counties in Zone 1 (highest)
82
Counties in Zone 2 (moderate)
8
Counties in Zone 3 (low)
782
ZIP code areas covered
Kentucky counties by EPA radon zone
Zone 1 · Highest potentialpredicted indoor average above 4 pCi/L · 30 counties
Adair, Allen, Barren, Bourbon, Boyle, Bullitt, Casey, Clark, Cumberland, Fayette, Franklin, Green, Harrison, Hart, Jefferson, Jessamine, Lincoln, Marion, Mercer, Metcalfe, Monroe, Nelson, Pendleton, Pulaski, Robertson, Russell, Scott, Taylor, Warren, Woodford
Zone 2 · Moderate potentialpredicted indoor average 2 to 4 pCi/L · 82 counties
Anderson, Bath, Bell, Boone, Boyd, Bracken, Breathitt, Breckinridge, Butler, Caldwell, Campbell, Carroll, Carter, Christian, Clay, Clinton, Crittenden, Daviess, Edmonson, Elliott, Estill, Fleming, Floyd, Gallatin, Garrard, Grant, Grayson, Greenup, Hancock, Hardin, Harlan, Henderson, Henry, Hopkins, Jackson, Johnson, Kenton, Knott, Knox, Larue, Laurel, Lawrence, Lee, Leslie, Letcher, Lewis, Livingston, Logan, Lyon, Madison, Magoffin, Martin, Mason, McCreary, McLean, Meade, Menifee, Montgomery, Morgan, Muhlenberg, Nicholas, Ohio, Oldham, Owen, Owsley, Perry, Pike, Powell, Rockcastle, Rowan, Shelby, Simpson, Spencer, Todd, Trigg, Trimble, Union, Washington, Wayne, Webster, Whitley, Wolfe
Zone 3 · Low potentialpredicted indoor average below 2 pCi/L · 8 counties
Ballard, Calloway, Carlisle, Fulton, Graves, Hickman, Marshall, McCracken
How this tool works
- Your ZIP is matched to its county with the U.S. Census Bureau 2020 ZCTA-to-county relationship file. ZIPs that cross a county line show every county they touch, with the share of the ZIP's land in each.
- Each county's zone comes from the EPA Map of Radon Zones (1993, still the EPA's current county map).
- Zone 1 counties have a predicted average indoor screening level above 4 pCi/L, Zone 2 between 2 and 4 pCi/L, Zone 3 below 2 pCi/L (EPA definitions).
- Prices are the typical local ranges posted on this site; a contractor quotes your actual home.
Sources
- EPA Map of Radon Zones
- EPA Map of Radon Zones: Kentucky (PDF)
- U.S. Census Bureau 2020 ZCTA-to-county relationship file
- EPA: A Citizen's Guide to Radon
Free to use and to link to. Please cite “Kentucky Radon Risk by ZIP Code (EPA Zone Check), Lexington Radon Pros” with a link to https://lexingtonradonpros.com/tools/radon-zip-check.
Quick answers
What radon zone is Fayette County, KY in?
Fayette County is in EPA Radon Zone 1. That is the highest-potential zone: the predicted average indoor screening level is above 4 pCi/L.
Does a Zone 3 county mean my house is safe?
No. The EPA says the zone map should not be used to decide whether to test. Homes with high radon have been found in every zone, and next-door houses can test very differently. Test your own home.
What radon level should I fix?
The EPA recommends fixing your home at 4 pCi/L or higher and considering a fix between 2 and 4 pCi/L.
Why does my ZIP show two counties?
ZIP codes follow mail routes, not county lines. The tool shows every county a ZIP touches and how much of the ZIP's land is in each, using Census data.
How much does radon mitigation cost here?
The price table on this page is the typical Lexington-area range posted on this site. Call or text (859) 249-8571 for a free quote from a certified local contractor.
Lexington Radon Pros is a free referral service for homeowners. We match your request with an independent radon mitigation contractor who is NRPP or NRSB certified and registered with Kentucky, serving Fayette County. The contractor performs the work and may pay us a referral fee. You never pay us anything, and you are free to get other quotes.
Want a real number for your home?
Send the form or call (859) 249-8571. We connect you with a Lexington-area contractor who quotes the job. Free, no obligation.
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