DuPont's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places DuPont 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. That puts DuPont in the 91th percentile nationally for seismic hazard - higher than 91% of the 4,875 US cities USGS was checked against here.

Where DuPont sits in Washington

USGS's underlying values for DuPont: 0.527g peak ground acceleration, 1.371g at short period, 0.486g at 1 second. Within Washington alone, DuPont ranks 47 of 125 cities by seismic hazard - the 63th percentile in-state. DuPont has a population of about 9,823.

Bracing and bolting: the actual cost

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Washington specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Washington.

Earthquake insurance for a DuPont home

A DuPont homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where DuPont's figures come from

DuPont's Category D and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category D does and doesn't tell you about DuPont.