Jackson County, FL: EPA's radon zone, explained
EPA places Jackson 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. Jackson County sits at the 22nd percentile nationally for radon potential — above 22 of every 100 rated counties.
Where Jackson County sits nationally
Jackson County, Florida is home to about 49,980 people across 918.315 square miles. Population density there runs about 54 people per square mile. By population, Jackson County is the 347th largest of every county sharing its EPA zone — the 66th percentile by population within that zone. Jackson County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.
Why the zone isn't the answer by itself
A Zone 3 county like Jackson County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 rating means Jackson County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.
Testing and mitigation in Jackson County
For a Jackson County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.
Find Florida's state radon program
For Jackson County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Jackson County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.
Where Jackson County's figures come from
The methodology guide shows exactly which EPA and Census sources feed Jackson County's numbers. Whatever zone Jackson County carries, the zone explainer covers what it does and doesn't tell you about any one house.