Sevier County, UT radon potential

EPA's own radon map rates Sevier County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Sevier County lands in the 83rd percentile for radon potential.

How Sevier County compares

Sevier County, Utah is home to about 22,520 people across 1,910.476 square miles. Population density there runs about 12 people per square mile. Within its own EPA zone, Sevier County is bigger by population than 50% of the counties that share it. Sevier County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Sevier County

Sevier County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Sevier County specifically.

Next steps for a home in Sevier 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 Sevier County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Sevier 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 Sevier County's figures come from

Sevier County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Sevier County carries, the zone explainer covers what it does and doesn't tell you about any one house.