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

Cedar 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 Cedar County lands in the 43rd percentile for radon potential.

Where Cedar County sits nationally

Cedar County, Missouri is home to about 15,023 people across 474.47 square miles. Population density there runs about 32 people per square mile. By population, Cedar County is the 716th largest of every county sharing its EPA zone — the 31st percentile by population within that zone. EPA's geology-based Region 7 groups Cedar County with 411 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Cedar County's Zone 2 prediction lands in the gap between the two. A county-wide moderate average, like Cedar County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Cedar County

For a Cedar 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 Cedar County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Cedar 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 Cedar 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.