Does South Jordan, UT need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, South Jordan is Category D. High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. Nationally, South Jordan ranks above 89% of the 4,875 cities in this dataset for seismic hazard - the 89th percentile.

Where South Jordan sits in Utah

The raw figures: peak ground acceleration 0.466g, short-period spectral response 1.064g, 1-second spectral response 0.38g. Among 95 Utah cities in this dataset, South Jordan ranks 61 for seismic hazard, the 36th percentile within the state. About 86,156 people live in South Jordan, Utah.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Utah. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

What this means for insurance

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a South Jordan address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced South Jordan's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.