Dunklin County, MO: EPA's radon zone, explained

Dunklin County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Dunklin County ranks higher in radon potential than 16% of rated counties (the 16th percentile).

Where Dunklin County sits nationally

Dunklin County, Missouri is home to about 27,002 people across 541.909 square miles. Population density there runs about 50 people per square mile. By population, Dunklin County is the 519th largest of every county sharing its EPA zone — the 50th percentile by population within that zone. Geologically, Dunklin County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Dunklin County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Dunklin County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Dunklin County

For a Dunklin 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 Missouri's state radon program

For Dunklin County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Dunklin 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 Dunklin 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. Whatever zone Dunklin County carries, the zone explainer covers what it does and doesn't tell you about any one house.