Is Lake County, OR a radon risk area?

Lake 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. Lake County sits at the 38th percentile nationally for radon potential — above 38 of every 100 rated counties.

Lake County by the numbers

About 8,194 people live in Lake County, Oregon, spread over 8,138.61 square miles. That works out to roughly 1 people per square mile. Rank 863 by population within its EPA zone puts Lake County at the 16th percentile among zone peers. EPA's geology-based Region 10 groups Lake County with 141 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

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 Lake County's Zone 2 prediction. A county-wide moderate average, like Lake County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Testing and mitigation in Lake County

Nothing about Lake County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Oregon's state radon program

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

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 Lake County carries, the zone explainer covers what it does and doesn't tell you about any one house.