Washoe County, NV radon potential

EPA's own radon map rates Washoe County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Washoe County ranks higher in radon potential than 64% of rated counties (the 64th percentile).

Where Washoe County sits nationally

Washoe County, Nevada is home to about 507,280 people across 6,315.884 square miles. That works out to roughly 80 people per square mile. Within its own EPA zone, Washoe County is bigger by population than 95% of the counties that share it. EPA's geology-based Region 9 groups Washoe County with 94 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Washoe County

Washoe 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. Washoe County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Next steps for a home in Washoe 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 Nevada's state radon program

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

Where Washoe County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Washoe County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.