Does Watertown, WI need an earthquake retrofit?

Watertown 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. Rank it against the rest of the country and Watertown sits at the 18th percentile for seismic hazard among 4,875 US cities.

Watertown by the numbers

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, Watertown ranks 64 for seismic hazard, the 60th percentile within the state. About 22,617 people live in Watertown, Wisconsin.

Bracing and bolting: the actual cost

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.

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 Watertown address.

More on how this number was built

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