Union County, FL radon potential

Union County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally, Union County ranks higher in radon potential than 44% of rated counties (the 44th percentile).

Where Union County sits nationally

Union County, Florida is home to about 15,738 people across 243.89 square miles. Population density there runs about 65 people per square mile. Within its own EPA zone, Union County is bigger by population than 32% of the counties that share it. Geologically, Union 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 Union County

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Union County's Zone 2 prediction. Nothing about a Zone 2 label lowers the case for testing in Union County — EPA recommends it in every zone, moderate included.

Next steps for a home in Union County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Florida's state radon program

For Union County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Union County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Union County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.