Klamath County, OR radon potential

Klamath 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. Klamath County sits at the 58th percentile nationally for radon potential — above 58 of every 100 rated counties.

Klamath County by the numbers

Klamath County, Oregon is home to about 70,438 people across 5,949.897 square miles. That works out to roughly 12 people per square mile. Within its own EPA zone, Klamath County is bigger by population than 75% of the counties that share it. EPA's geology-based Region 10 groups Klamath County with 141 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Klamath County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Klamath 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 Klamath County tests above the action level

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Oregon's state radon program

For Klamath County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Klamath 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 Klamath County's figures come from

Klamath County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.