Does Tumwater, WA need an earthquake retrofit?

Tumwater 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 Tumwater in the 93th percentile nationally for seismic hazard - higher than 93% of the 4,875 US cities USGS was checked against here.

How Tumwater compares

The raw figures: peak ground acceleration 0.598g, short-period spectral response 1.386g, 1-second spectral response 0.52g. Among 125 Washington cities in this dataset, Tumwater ranks 19 for seismic hazard, the 85th percentile within the state. About 27,826 people live in Tumwater, Washington.

Retrofit economics for Tumwater

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.

Earthquake insurance for a Tumwater home

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 Tumwater address.

More on how this number was built

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