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

EPA's own radon map rates Hickory County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Hickory County lands in the 39th percentile for radon potential.

Where Hickory County sits nationally

Hickory County, Missouri is home to about 8,766 people across 398.808 square miles. Population density there runs about 22 people per square mile. By population, Hickory County is the 846th largest of every county sharing its EPA zone — the 18th percentile by population within that zone. Geologically, Hickory County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

What this actually means for a house in Hickory County

Hickory County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Hickory County — testing is the only way to know an individual home's actual level.

Testing and mitigation in Hickory County

For a Hickory 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 Hickory County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Hickory County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Hickory County's figures come from

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