Jackson County, KS: EPA's radon zone, explained

Jackson County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 78th percentile for radon potential — Jackson County outranks 78% of every county EPA has rated.

Jackson County by the numbers

Jackson County, Kansas is home to about 13,525 people across 656.219 square miles. That works out to roughly 21 people per square mile. By population, Jackson County is the 695th largest of every county sharing its EPA zone — the 35th percentile by population within that zone. Jackson County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Jackson County

Where the national indoor average runs about 1.3 pCi/L, Jackson County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Jackson County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Jackson County tests above the action level

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 Kansas'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. Code RADONZONE-10OFF takes 10% off at checkout.

Where Jackson County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Jackson County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.