Ontario, CA: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Ontario in Seismic Design Category D: 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 Ontario sits at the 95th percentile for seismic hazard among 4,875 US cities.

How Ontario compares

USGS's underlying values for Ontario: 0.663g peak ground acceleration, 1.589g at short period, 0.579g at 1 second. Within California alone, Ontario ranks 199 of 429 cities by seismic hazard - the 54th percentile in-state. Ontario has a population of about 185,285.

Retrofit economics for Ontario

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.

Earthquake insurance for a Ontario home

Ontario 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 Ontario's figures come from

Ontario'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.