Prosser, WA: what USGS's seismic model says

Prosser 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. Nationally, Prosser ranks above 81% of the 4,875 cities in this dataset for seismic hazard - the 81th percentile.

Prosser by the numbers

USGS's underlying values for Prosser: 0.197g peak ground acceleration, 0.439g at short period, 0.169g at 1 second. Within Washington alone, Prosser ranks 102 of 125 cities by seismic hazard - the 19th percentile in-state. Prosser has a population of about 6,540.

Retrofit economics for Prosser

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 Prosser home

A Prosser 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 Prosser's figures come from

Prosser'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 Prosser.