Ennis's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Ennis in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Ennis in the 20th percentile nationally for seismic hazard - higher than 20% of the 4,875 US cities USGS was checked against here.

Where Ennis sits in Texas

The raw figures: peak ground acceleration 0.039g, short-period spectral response 0.084g, 1-second spectral response 0.051g. Among 384 Texas cities in this dataset, Ennis ranks 168 for seismic hazard, the 56th percentile within the state. About 24,753 people live in Ennis, Texas.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Texas. 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 Ennis address.

More on how this number was built

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