Property due diligence · Reviewed 2026-07-22

Utah geologic hazards: a property screening checklist

Use Utah Geological Survey maps to identify questions for a property, then move from a regional screen to local records and site-specific professional review.

Utah Geological Survey hazard maps identify areas that may be affected by earthquakes, landslides, debris flows, rockfall, poor soil conditions, radon, or floods. Their purpose is to show where more evaluation may be needed before development.

The useful unit is the exact site and proposed use, not a citywide or countywide label. A home purchase, addition, retaining wall, cut slope, septic system, or new structure can ask different questions of the same geology.

Local governments may hold geotechnical reports and enforce adopted hazard ordinances or building requirements. A licensed professional can investigate the site conditions, while the permit authority decides the local submittal and approval path.

Guide details

Search more than one hazard family

Begin with the address, parcel boundary, slope position, drainage, and proposed work. Review the available earthquake and fault, liquefaction, landslide, debris-flow, rockfall, flooding, radon, and problem-soil information that could fit the site.

Example: a parcel outside one mapped fault corridor can still have steep-slope, landslide, collapsible-soil, debris-flow, or flood questions. One clear layer does not settle the rest.

Read the map's purpose and limits

Record the map title, publication date, scale, hazard class, legend, and whether the product is statewide, countywide, subdivision-scale, or site-specific. A regional potential map cannot be enlarged into a parcel investigation.

Use the UGS publication directory and underlying report, not only a screenshot. The report explains what was mapped, what the symbols mean, and when additional evaluation is recommended.

Ask the local authority for the project record

Contact the city or county engineering, planning, building, or development office for the exact parcel and proposed use. Ask about adopted hazard ordinances, subdivision reports, prior geotechnical studies, permit conditions, and the study standard for new work.

The UGS homebuyer guide warns that local approval of a subdivision or building permit does not guarantee safety from geologic hazards. Treat the permit record as one part of due diligence.

Escalate from screening to a site conclusion

A qualified engineering geologist or geotechnical engineer can evaluate the site, structure, and proposed work using field observations, records, subsurface information, and the applicable professional standard.

Verify the professional's Utah license and define the question in writing. A useful scope says whether the review concerns fault rupture, slope stability, soils, groundwater, debris flow, foundation design, or another specific condition.

Official doorways

Continue with the controlling source

Move from broad to narrow: hazard family, published map and report, local project record, then a site-specific professional question where needed.

Property screen Start with the homebuyer guide See what maps can and cannot answer and which local or professional records come next. Open homebuyer guide Maps Live check Search hazard publications Filter official products by county and hazard, then read the underlying report and legend. Search hazard maps Hazard type Choose the relevant hazard family Open earthquake, landslide, flooding, problem-soil, radon, and other Utah hazard resources. Open hazard directory Professional Live check Verify a Utah license Confirm the license status of the geologist, engineer, or contractor providing the site-specific work. Verify license

First moves

1
Gather the address, parcel map, survey, seller disclosures, prior studies, building records, and a clear description of the proposed use.
2
Search each plausible hazard family and save the map title, date, scale, legend, report, and parcel location.
3
Ask the city or county for adopted hazard requirements, subdivision or site reports, permit conditions, and the required study standard.
4
Use a Utah-licensed engineering geologist or geotechnical engineer when a parcel or project needs a site-specific conclusion.

Watch for

No symbol on one map is not a finding that the parcel is safe.
A county or ZIP-code hazard label is too broad for a parcel decision.
A permit approval does not replace geologic due diligence or a required site study.
A regional map or local permit record does not replace a site-specific professional conclusion when the project needs one.

Where to confirm this

Guide for homebuyers and real-estate agents
Utah Geological Survey

Property-screening limits, local report path, permit caution, and professional follow-up.

Checked 2026-07-22
Hazard maps and publications
Utah Geological Survey

County, hazard, map, publication, and report doorway for potential-hazard screening.

Checked 2026-07-22
Geologic hazards program
Utah Geological Survey

Official hazard-family and assistance directory.

Checked 2026-07-22
Local government hazard assistance
Utah Geological Survey

Local planning, ordinance, report-review, and site-specific study framework.

Checked 2026-07-22
Verify a professional license
Utah Division of Professional Licensing

License verification for a Utah geologist, engineer, or contractor used in the follow-up.

Checked 2026-07-22

Utah Porch provides a screening sequence, not a parcel risk score, disclosure opinion, engineering conclusion, insurance interpretation, or permit decision.