Radon by ZIP

Radon zones in Utah

Last updated

EPA’s Map of Radon Zones places 29 Utah counties in its three radon potential zones: 7 in Zone 1 (highest), 22 in Zone 2 (moderate), and 0 in Zone 3 (low).

7Zone 1 · Highest potential
22Zone 2 · Moderate potential
0Zone 3 · Low potential

What this means for Utah homes

Most Utah counties fall in Zone 2. EPA predicts moderate average indoor levels (2 to 4 pCi/L) across much of Utah. Many homes will be below the action level, but many will not, and only a test can tell which.

EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.

Utah radon program

EPA lists the following state contact for Utah: UT Dept. of Environmental Quality, Radiation Control Division, phone 801-536-0091. Website: deq.utah.gov/waste-management-and-radiation-control/radon/radon-program. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.

Utah counties and their EPA radon zones

CountyEPA radon zone
Beaver CountyZone 2
Box Elder CountyZone 2
Cache CountyZone 2
Carbon CountyZone 1
Daggett CountyZone 2
Davis CountyZone 2
Duchesne CountyZone 1
Emery CountyZone 2
Garfield CountyZone 2
Grand CountyZone 1
Iron CountyZone 2
Juab CountyZone 2
Kane CountyZone 2
Millard CountyZone 2
Morgan CountyZone 2
Piute CountyZone 1
Rich CountyZone 2
Salt Lake CountyZone 2
San Juan CountyZone 2
Sanpete CountyZone 1
Sevier CountyZone 1
Summit CountyZone 2
Tooele CountyZone 2
Uintah CountyZone 1
Utah CountyZone 2
Wasatch CountyZone 2
Washington CountyZone 2
Wayne CountyZone 2
Weber CountyZone 2

County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.

Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.

Sources

  1. U.S. EPA, EPA Map of Radon Zones (text version)
  2. U.S. EPA, EPA Map of Radon Zones and Supplemental Information (state radon contacts)
  3. U.S. EPA, EPA Maps of Radon Zones and Supporting Documents by State