Does Vacaville, CA need an earthquake retrofit?

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

Where Vacaville sits in California

The raw figures: peak ground acceleration 0.561g, short-period spectral response 1.348g, 1-second spectral response 0.479g. Among 429 California cities in this dataset, Vacaville ranks 274 for seismic hazard, the 36th percentile within the state. About 103,994 people live in Vacaville, California.

What a retrofit costs in Vacaville

Because Vacaville is in California, the EBB grant applies if the ZIP code participates and the house qualifies (wood-framed house on a raised (not slab-on-grade) foundation, built before 1980): a $3,000-$7,000 bracing-and-bolting job drops to $0-$4,000 after the $3,000 base grant, or effectively free for income-eligible households getting the full $10,000.

Insuring against this, not just retrofitting

Earthquake coverage in California mostly runs through the California Earthquake Authority (CEA), sold only through licensed agents at CEA-participating insurers - there is no direct-to-consumer CEA policy. A general home-insurance quote is the practical starting point for a Vacaville homeowner asking about it.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Vacaville's numbers. The retrofit cost and grant guide covers every EBB eligibility rule, including the ones this page can't check.