Utah Radon Map 2025: High-Risk Zones You Should Know

Radon gas is a silent hazard in Utah homes, and understanding where it’s most prevalent is critical for homeowners, buyers, and builders. The 2025 Utah Radon Map highlights key regions across the state where radon levels are highest—and where testing and mitigation are most urgent.

Here’s what you need to know about radon risk zones in Utah and how to take action if your property is located in one.

Why Utah Has Elevated Radon Risk

Utah’s natural geology is rich in uranium, which breaks down and releases radon gas through soil and rock. This gas rises through the ground and enters homes through cracks, foundation gaps, and other openings.

What makes Utah unique is the variation in elevation, soil types, and building practices. Homes in mountainous areas and valleys alike are susceptible—making radon testing a statewide priority.

High-Risk Counties and Cities in Utah

According to the latest data, these areas in Utah are considered high radon zones:

Salt Lake County – Many homes exceed the EPA’s 4.0 pCi/L action level, especially in older neighborhoods and those near the foothills.
Utah County – Provo, Orem, and Lehi consistently show elevated readings, particularly in basement-heavy homes.
Summit County – Park City’s high elevation and rock-rich soil put it at risk despite its newer construction.
Weber County – Ogden homes often report high radon levels due to older foundations and poor ventilation.
Davis County – Kaysville, Farmington, and surrounding areas have widespread risk.
Cache County – Logan and nearby towns show moderate to high levels, with many homes needing mitigation.
Washington County – While radon levels in St. George vary, many homes in newer developments still test above recommended limits.

Every county in Utah has some level of radon exposure. Even within the same neighborhood, radon levels can vary from home to home.

What the 2025 Utah Radon Map Shows

The updated 2025 map uses color-coded zones to show average test results by region. Red and orange zones indicate higher average readings, while yellow and green suggest moderate or low levels. However, even homes in green zones should still be tested—radon doesn’t follow boundaries.

The EPA and Utah Department of Environmental Quality recommend that all homes in Utah be tested, regardless of zip code or age.

What to Do if You’re in a High-Risk Zone

If you live in or are buying a home in one of Utah’s high-radon areas, take these steps:

Schedule a radon test—preferably during winter when readings are most accurate.
Review the results—anything over 4.0 pCi/L requires mitigation.
Install a mitigation system—sub-slab depressurization is the most common and effective method.
Retest after installation to ensure the system is working properly.
Maintain the system annually to ensure consistent protection.

Trust Utah Mitigation for Statewide Radon Solutions

At Utah Mitigation, we provide fast, accurate radon testing and mitigation across the state. Our team works with homeowners, contractors, and property managers to protect Utah families from the dangers of radon exposure—no matter where you live.