Does Washington, MO need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Washington 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 Washington sits at the 80th percentile for seismic hazard among 4,875 US cities.

Where Washington sits in Missouri

USGS's underlying values for Washington: 0.161g peak ground acceleration, 0.311g at short period, 0.137g at 1 second. Within Missouri alone, Washington ranks 64 of 135 cities by seismic hazard - the 53th percentile in-state. Washington has a population of about 15,521.

Retrofit economics for Washington

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 Missouri 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 Missouri.

What this means for insurance

A Washington 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 Washington's figures come from

Washington'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 Washington.