Sun Prairie, WI: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Sun Prairie in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Sun Prairie ranks above 18% of the 4,875 cities in this dataset for seismic hazard - the 18th percentile.

How Sun Prairie compares

The raw figures: peak ground acceleration 0.035g, short-period spectral response 0.072g, 1-second spectral response 0.047g. Among 157 Wisconsin cities in this dataset, Sun Prairie ranks 63 for seismic hazard, the 60th percentile within the state. About 39,253 people live in Sun Prairie, Wisconsin.

Retrofit economics for Sun Prairie

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

Earthquake insurance for a Sun Prairie home

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 Sun Prairie address.

More on how this number was built

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