What EPA's radon map says about Wasco County

Wasco 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 Wasco County lands in the 49th percentile for radon potential.

Where Wasco County sits nationally

About 26,507 people live in Wasco County, Oregon, spread over 2,381.119 square miles. Averaged across its land area, Wasco County runs about 11 people per square mile. Among counties sharing Wasco County's EPA zone, it outranks 49% of them by population. Geologically, Wasco County is grouped into EPA Region 10 alongside 141 other counties that share its rock and soil setting.

What this actually means for a house in Wasco County

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

If Wasco County tests above the action level

Mitigation cost doesn't depend on Wasco 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 Oregon's state radon program

Wasco County's test kit answers today; a Airthings radon monitor keeps answering for Wasco 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

Wasco County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.