Plain City's Seismic Design Category, explained

Plain City 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. That puts Plain City in the 92th percentile nationally for seismic hazard - higher than 92% of the 4,875 US cities USGS was checked against here.

How Plain City compares

The raw figures: peak ground acceleration 0.574g, short-period spectral response 1.287g, 1-second spectral response 0.458g. Among 95 Utah cities in this dataset, Plain City ranks 49 for seismic hazard, the 49th percentile within the state. About 8,880 people live in Plain City, Utah.

Retrofit economics for Plain City

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 Plain City address.

More on how this number was built

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