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

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Orange City in Seismic Design Category A: Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and Orange City sits at the 13th percentile for seismic hazard among 4,875 US cities.

Orange City by the numbers

USGS's underlying values for Orange City: 0.035g peak ground acceleration, 0.074g at short period, 0.038g at 1 second. Within Iowa alone, Orange City ranks 76 of 85 cities by seismic hazard - the 11th percentile in-state. Orange City has a population of about 6,547.

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.

Earthquake insurance for a Orange City home

A Orange 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 Orange City's figures come from

Orange City's Category A 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 A does and doesn't tell you about Orange City.