Herriman, UT: what USGS's seismic model says

Herriman carries Seismic Design Category D under USGS's ASCE 7-16 model. 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, Herriman ranks above 89% of the 4,875 cities in this dataset for seismic hazard - the 89th percentile.

Herriman by the numbers

The raw figures: peak ground acceleration 0.46g, short-period spectral response 1.049g, 1-second spectral response 0.378g. Among 95 Utah cities in this dataset, Herriman ranks 64 for seismic hazard, the 33th percentile within the state. About 62,352 people live in Herriman, Utah.

What a retrofit costs in Herriman

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 Herriman address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Herriman'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.