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

EPA's own radon map rates Stoddard County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Stoddard County ranks higher in radon potential than 17% of rated counties (the 17th percentile).

How Stoddard County compares

Stoddard County, Missouri is home to about 28,438 people across 823.142 square miles. That works out to roughly 35 people per square mile. By population, Stoddard County is the 500th largest of every county sharing its EPA zone — the 52nd percentile by population within that zone. EPA's geology-based Region 7 groups Stoddard County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Stoddard County

A Zone 3 county like Stoddard 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 Stoddard 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.

Next steps for a home in Stoddard County

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

The methodology guide shows exactly which EPA and Census sources feed Stoddard County's numbers. Whatever zone Stoddard County carries, the zone explainer covers what it does and doesn't tell you about any one house.