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

EPA's own radon map rates Ozark County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 39th percentile for radon potential — Ozark County outranks 39% of every county EPA has rated.

Where Ozark County sits nationally

Ozark County, Missouri is home to about 9,090 people across 745.006 square miles. Averaged across its land area, Ozark County runs about 12 people per square mile. By population, Ozark County is the 838th largest of every county sharing its EPA zone — the 19th percentile by population within that zone. EPA's geology-based Region 7 groups Ozark County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Ozark County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Ozark County's Zone 2 prediction lands in the gap between the two. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Ozark County — testing is the only way to know an individual home's actual level.

If Ozark County tests above the action level

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

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