Salt Lake County, UT radon potential

Salt Lake 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. Nationally, Salt Lake County ranks higher in radon potential than 66% of rated counties (the 66th percentile).

Salt Lake County by the numbers

Salt Lake County, Utah is home to about 1,216,274 people across 752.852 square miles. Population density there runs about 1,616 people per square mile. Within its own EPA zone, Salt Lake County is bigger by population than 99% of the counties that share it. Salt Lake County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Salt Lake 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. A county-wide moderate average, like Salt Lake County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Salt Lake 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 Utah's state radon program

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

Salt Lake 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.