Spokane Valley, WA: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Spokane Valley is Category C. Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. That puts Spokane Valley in the 74th percentile nationally for seismic hazard - higher than 74% of the 4,875 US cities USGS was checked against here.

How Spokane Valley compares

The raw figures: peak ground acceleration 0.14g, short-period spectral response 0.313g, 1-second spectral response 0.111g. Among 125 Washington cities in this dataset, Spokane Valley ranks 117 for seismic hazard, the 6th percentile within the state. About 108,267 people live in Spokane Valley, Washington.

What a retrofit costs in Spokane Valley

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

Insuring against this, not just retrofitting

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 Spokane Valley address.

More on how this number was built

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