Webster City, IA: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Webster City in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Webster City ranks above 16% of the 4,875 cities in this dataset for seismic hazard - the 16th percentile.

Webster City by the numbers

USGS's underlying values for Webster City: 0.026g peak ground acceleration, 0.055g at short period, 0.044g at 1 second. Within Iowa alone, Webster City ranks 69 of 85 cities by seismic hazard - the 19th percentile in-state. Webster City has a population of about 7,763.

What a retrofit costs in Webster City

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 Webster City 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 Webster City's figures come from

Webster City'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 Webster City.