What EPA's radon map says about Oregon County

Oregon 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 Oregon County in the 39th percentile nationally for radon potential — higher than 39% of the counties EPA has rated.

Oregon County by the numbers

About 8,699 people live in Oregon County, Missouri, spread over 789.844 square miles. That works out to roughly 11 people per square mile. Among counties sharing Oregon County's EPA zone, it outranks 18% of them by population. Geologically, Oregon County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

What this actually means for a house in Oregon County

Oregon 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. Middle-of-the-pack doesn't mean risk-free for any one Oregon County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Oregon County

Mitigation cost doesn't depend on Oregon County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Missouri's state radon program

Oregon County's test kit answers today; a Airthings radon monitor keeps answering for Oregon County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Oregon County carries, the zone explainer covers what it does and doesn't tell you about any one house.