Watertown, MA: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Watertown in Seismic Design Category B: 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 63th percentile for seismic hazard among 4,875 US cities.

How Watertown compares

The raw figures: peak ground acceleration 0.162g, short-period spectral response 0.272g, 1-second spectral response 0.066g. Among 58 Massachusetts cities in this dataset, Watertown ranks 24 for seismic hazard, the 60th percentile within the state. About 35,985 people live in Watertown, Massachusetts.

Retrofit economics for Watertown

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

Earthquake insurance for a Watertown 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 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.