Toppenish, WA: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Toppenish is 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 Toppenish sits at the 82th percentile for seismic hazard among 4,875 US cities.

How Toppenish compares

USGS's underlying values for Toppenish: 0.201g peak ground acceleration, 0.45g at short period, 0.186g at 1 second. Within Washington alone, Toppenish ranks 99 of 125 cities by seismic hazard - the 21th percentile in-state. Toppenish has a population of about 8,658.

Retrofit economics for Toppenish

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.

Insuring against this, not just retrofitting

A Toppenish 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 Toppenish's figures come from

Toppenish'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 Toppenish.