Jackson County, MO radon potential

EPA's own radon map rates Jackson County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally, Jackson County ranks higher in radon potential than 99% of rated counties (the 99th percentile).

Where Jackson County sits nationally

Jackson County, Missouri is home to about 727,362 people across 604.52 square miles. Population density there runs about 1,203 people per square mile. Within its own EPA zone, Jackson County is bigger by population than 98% of the counties that share it. EPA's geology-based Region 7 groups Jackson County with 411 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Jackson County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Jackson County specifically.

Next steps for a home in Jackson 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 Missouri'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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.