Clark County, NV radon potential

Clark County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. That puts Clark County in the 33rd percentile nationally for radon potential — higher than 33% of the counties EPA has rated.

Clark County by the numbers

Clark County, Nevada is home to about 2,398,871 people across 7,891.661 square miles. Population density there runs about 304 people per square mile. Within its own EPA zone, Clark County is bigger by population than 100% of the counties that share it. EPA's geology-based Region 9 groups Clark County with 94 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Clark County's Zone 3 prediction is the low end of the scale. Don't read Zone 3 as a pass for Clark County — EPA's guidance to test every home makes no exception for counties predicted low.

If Clark 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 Nevada's state radon program

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

Where Clark County's figures come from

Clark 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.