Ground-hazard map checks in the Salt Lake Valley

Start with the address in the Utah Geologic Hazards Portal, then turn on the layers that match the questions you are asking. A blank or clear-looking map view is not parcel clearance. It may mean the chosen layer does not show a mapped condition at that scale, while a different hazard or a more detailed study still needs attention.

The portal separates earthquake, landslide, flooding, and problem-soil information. Its Surface-Fault-Rupture Hazard Special-Study Zones layer answers a different question from Hazardous Faults - Utah Quaternary Fault Database. Liquefaction Susceptibility is another layer, as are Expansive Soil and Rock Susceptibility and Collapsible Soil Susceptibility. Read each legend and mapped-scale field instead of treating one layer as a general property check.

Other Utah property questions can include landslides, debris flows, rockfall, flooding, radon, and problem soils. One clear layer does not settle the others. The useful result of the screen is a short list of conditions and records to investigate, not a yes-or-no diagnosis for the parcel.

The next office depends on the address. Salt Lake County Chapter 19.75 applies its special-study maps and report matrix in unincorporated Salt Lake County, and the ordinance says its mapped areas are not exhaustive. That county matrix does not establish the rule for an address inside Salt Lake City, Millcreek, Cottonwood Heights, Sandy, Holladay, Murray, Midvale, South Salt Lake, or another incorporated city. For a city address, check the city’s current code and ask its reviewing office whether the proposed work triggers a report.

Local government may hold adopted hazard requirements and earlier project reports. A qualified engineering geologist or geotechnical engineer can provide a site-specific evaluation; verify the professional’s Utah license before relying on the work. A subdivision or building-permit approval is not a promise that a property is free of geologic hazards.

Save the address, parcel number, proposed work, portal layers you checked, and each layer’s mapped scale. Ask the correct city or county office for the current ordinance, trigger, and any reports tied to the property or development. If the screen or local record raises a question, take that record to a qualified professional rather than trying to settle it from the map alone. The broader sequence is in Utah geologic hazards.