Howard County, MO radon potential

Howard 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. That puts Howard County in the 40th percentile nationally for radon potential — higher than 40% of the counties EPA has rated.

Howard County by the numbers

Howard County, Missouri is home to about 10,150 people across 463.801 square miles. That works out to roughly 22 people per square mile. Within its own EPA zone, Howard County is bigger by population than 21% of the counties that share it. Geologically, Howard 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

Howard 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 Howard County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Howard 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 Howard County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Howard 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 Howard 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.