South Sioux City, NE: what USGS's seismic model says

South Sioux City carries Seismic Design Category A under USGS's ASCE 7-16 model. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, South Sioux City ranks above 13% of the 4,875 cities in this dataset for seismic hazard - the 13th percentile.

Where South Sioux City sits in Nebraska

The raw figures: peak ground acceleration 0.04g, short-period spectral response 0.082g, 1-second spectral response 0.04g. Among 32 Nebraska cities in this dataset, South Sioux City ranks 26 for seismic hazard, the 19th percentile within the state. About 13,910 people live in South Sioux City, Nebraska.

Retrofit economics for South Sioux City

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Nebraska. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Insuring against this, not just retrofitting

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a South Sioux City address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced South Sioux City's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.