Madison County, FL radon potential

EPA places Madison County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Madison County lands in the 12th percentile for radon potential.

How Madison County compares

Madison County, Florida is home to about 18,364 people across 696.529 square miles. Population density there runs about 26 people per square mile. Within its own EPA zone, Madison County is bigger by population than 36% of the counties that share it. EPA's geology-based Region 4 groups Madison County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

A Zone 3 county like Madison County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 label describes Madison County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Madison County tests above the action level

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 Madison County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Madison 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 Madison County's figures come from

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