Hiawatha, IA: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Hiawatha in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Hiawatha ranks above 17% of the 4,875 cities in this dataset for seismic hazard - the 17th percentile.

Hiawatha by the numbers

The raw figures: peak ground acceleration 0.032g, short-period spectral response 0.068g, 1-second spectral response 0.054g. Among 85 Iowa cities in this dataset, Hiawatha ranks 33 for seismic hazard, the 62th percentile within the state. About 7,347 people live in Hiawatha, Iowa.

Retrofit economics for Hiawatha

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

What this means for insurance

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 Hiawatha address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Hiawatha'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.