Yuba County, CA radon potential

EPA places Yuba 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. Yuba County sits at the 59th percentile nationally for radon potential — above 59 of every 100 rated counties.

Where Yuba County sits nationally

Yuba County, California is home to about 87,469 people across 632.006 square miles. Averaged across its land area, Yuba County runs about 138 people per square mile. Within its own EPA zone, Yuba County is bigger by population than 78% of the counties that share it. EPA's geology-based Region 9 groups Yuba County with 94 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Yuba County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Yuba County — EPA recommends it in every zone, moderate included.

Next steps for a home in Yuba County

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 California's state radon program

For Yuba County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Yuba County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Yuba County's figures come from

Yuba 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.