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

EPA places Wright County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Wright County sits at the 46th percentile nationally for radon potential — above 46 of every 100 rated counties.

Where Wright County sits nationally

Wright County, Missouri is home to about 19,505 people across 681.775 square miles. That works out to roughly 29 people per square mile. By population, Wright County is the 636th largest of every county sharing its EPA zone — the 38th percentile by population within that zone. Wright County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Wright County

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Wright County's Zone 2 prediction. Wright County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

If Wright County tests above the action level

For a Wright 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 Wright County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Wright 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 Wright 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.