Stone County, MO radon potential

Stone 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 Stone County lands in the 51st percentile for radon potential.

Where Stone County sits nationally

Stone County, Missouri is home to about 32,630 people across 463.813 square miles. Population density there runs about 70 people per square mile. Within its own EPA zone, Stone County is bigger by population than 55% of the counties that share it. Geologically, Stone County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Stone County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A county-wide moderate average, like Stone County's, can still hide a specific house well above or below it — testing is what actually answers the question.

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

The methodology guide shows exactly which EPA and Census sources feed Stone County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.