Does Duncanville, TX need an earthquake retrofit?

Duncanville 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. Nationally, Duncanville ranks above 24% of the 4,875 cities in this dataset for seismic hazard - the 24th percentile.

How Duncanville compares

The raw figures: peak ground acceleration 0.043g, short-period spectral response 0.09g, 1-second spectral response 0.052g. Among 384 Texas cities in this dataset, Duncanville ranks 138 for seismic hazard, the 64th percentile within the state. About 39,203 people live in Duncanville, 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.

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 Duncanville address.

More on how this number was built

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