Locations and reports
EPA puts Jefferson County, where Louisville is, in Zone 1, its highest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
The data
Louisville, What is published
Radon data is published by county, not by city
Radon data is published by county, not by city. EPA assigns radon zones to counties, and CDC publishes radon test figures by county. Neither publishes a figure for Louisville, so every radon figure on this page belongs to a county and is labelled with it. Only a test tells you about one home.
Jefferson County has an EPA zone and its own CDC test figures, shown below.
Louisville, Counties
Each county's own EPA zone and its own published CDC figures for 2008 to 2017, laboratory, the newest period any of them has. A county without a figure for that period is shown without one, never with a figure from another year.
Jefferson CountyZone 1Highest predicted potential
The median reported pre-mitigation result for 2008 to 2017, laboratory was 2.7 pCi/L in Jefferson County.
CDC counts radon tests that were reported to it, not homes, and figures from few tests can swing widely from year to year. Each county’s report has its full history.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
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Local help
Louisville, Professionals
Businesses whose listed city is Louisville, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Louisville: 1 of 1
1 listing with Louisville as the city. See radon mitigation and testing in Louisville, or all radon professionals in Kentucky.
Louisville, Local resources
Who to ask in Kentucky: its radon program, test kits and professionals.
What it means
Louisville, Questions
EPA's Map of Radon Zones classifies counties, not cities. Jefferson County is in Zone 1 (highest predicted potential). A zone is a prediction for a whole county and never tells you the level in one home.
For 2008 to 2017, laboratory, the share of radon tests reported to CDC that were at or above 4 pCi/L was 39.4% in Jefferson County (6,590 tests). Each is that county's own figure, counting tests reported to CDC, not homes. Radon411 does not average or combine them into a figure for the city.
Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.
The answers use the published figures of Jefferson County, the county Louisville lies in.
Explore
Louisville, Next steps
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