Redwood City's Seismic Design Category, explained

Redwood 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. Rank it against the rest of the country and Redwood City sits at the 94th percentile for seismic hazard among 4,875 US cities.

Where Redwood City sits in California

USGS's underlying values for Redwood City: 0.64g peak ground acceleration, 1.5g at short period, 0.6g at 1 second. Within California alone, Redwood City ranks 219 of 429 cities by seismic hazard - the 49th percentile in-state. Redwood City has a population of about 82,982.

Retrofit economics for Redwood City

Cripple-wall bracing and foundation bolting - the scope California's Earthquake Brace + Bolt (EBB) grant funds - typically runs $3,000-$7,000 nationally. Every qualifying household gets a $3,000 base grant, which brings that down to $0-$4,000 out of pocket; income-eligible households ($89,040/year or under) can get up to $10,000 total, covering the retrofit outright in most cases.

Insuring against this, not just retrofitting

Redwood City sits in CEA territory, but CEA earthquake coverage is agent-sold only, never direct - so the real first step for a homeowner here is a standard home-insurance quote, then asking that agent about CEA specifically.

Where Redwood City's figures come from

Redwood City's Category D and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. Full Brace + Bolt eligibility rules - beyond what this page can check from a ZIP code alone - are in the retrofit cost and grant guide.