Eldridge, IA: what USGS's seismic model says

Eldridge carries Seismic Design Category B under USGS's ASCE 7-16 model. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Eldridge in the 24th percentile nationally for seismic hazard - higher than 24% of the 4,875 US cities USGS was checked against here.

Where Eldridge sits in Iowa

USGS's underlying values for Eldridge: 0.044g peak ground acceleration, 0.091g at short period, 0.064g at 1 second. Within Iowa alone, Eldridge ranks 7 of 85 cities by seismic hazard - the 93th percentile in-state. Eldridge has a population of about 6,967.

Bracing and bolting: the actual cost

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 Eldridge 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 Eldridge's figures come from

Eldridge'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 Eldridge.