Does Lake Stevens, WA need an earthquake retrofit?

Lake Stevens 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. That puts Lake Stevens in the 89th percentile nationally for seismic hazard - higher than 89% of the 4,875 US cities USGS was checked against here.

How Lake Stevens compares

USGS's underlying values for Lake Stevens: 0.472g peak ground acceleration, 1.108g at short period, 0.393g at 1 second. Within Washington alone, Lake Stevens ranks 75 of 125 cities by seismic hazard - the 40th percentile in-state. Lake Stevens has a population of about 41,350.

Retrofit economics for Lake Stevens

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.

What this means for insurance

A Lake Stevens 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 Lake Stevens's figures come from

Lake Stevens'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 Lake Stevens.