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

EPA's own radon map rates Nodaway County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Nodaway County in the 82nd percentile nationally for radon potential — higher than 82% of the counties EPA has rated.

Nodaway County by the numbers

Nodaway County, Missouri is home to about 20,503 people across 876.964 square miles. Population density there runs about 23 people per square mile. By population, Nodaway County is the 569th largest of every county sharing its EPA zone — the 47th percentile by population within that zone. Nodaway County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Nodaway County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. That doesn't mean every Nodaway County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

If Nodaway County tests above the action level

For a Nodaway 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 Nodaway County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Nodaway County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Nodaway 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.