West Des Moines, IA: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places West Des Moines in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts West Des Moines in the 17th percentile nationally for seismic hazard - higher than 17% of the 4,875 US cities USGS was checked against here.

How West Des Moines compares

USGS's underlying values for West Des Moines: 0.03g peak ground acceleration, 0.062g at short period, 0.052g at 1 second. Within Iowa alone, West Des Moines ranks 40 of 85 cities by seismic hazard - the 54th percentile in-state. West Des Moines has a population of about 73,664.

What a retrofit costs in West Des Moines

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 Iowa 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 Iowa.

What this means for insurance

A West Des Moines 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 West Des Moines's figures come from

West Des Moines's Category B 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 B does and doesn't tell you about West Des Moines.