Osage County, MO radon potential

Osage County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Rank it against the rest of the country and Osage County lands in the 42nd percentile for radon potential.

Osage County by the numbers

Osage County, Missouri is home to about 13,478 people across 606.58 square miles. Population density there runs about 22 people per square mile. Within its own EPA zone, Osage County is bigger by population than 28% of the counties that share it. EPA's geology-based Region 7 groups Osage County with 411 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

EPA's Zone 2 rating for Osage County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Osage County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Osage County tests above the action level

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