What EPA's radon map says about Harney County

EPA places Harney 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. Nationally, Harney County ranks higher in radon potential than 38% of rated counties (the 38th percentile).

Harney County by the numbers

About 7,402 people live in Harney County, Oregon, spread over 10,134.46 square miles. Averaged across its land area, Harney County runs about 1 people per square mile. Among counties sharing Harney County's EPA zone, it outranks 14% of them by population. Geologically, Harney County is grouped into EPA Region 10 alongside 141 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Harney County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Harney County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Harney County

Mitigation cost doesn't depend on Harney 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

Harney County's test kit answers today; a Airthings radon monitor keeps answering for Harney 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 Harney County carries, the zone explainer covers what it does and doesn't tell you about any one house.