Does Zachary, LA need an earthquake retrofit?

Zachary 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 Zachary sits at the 24th percentile for seismic hazard among 4,875 US cities.

Zachary by the numbers

The raw figures: peak ground acceleration 0.043g, short-period spectral response 0.09g, 1-second spectral response 0.06g. Among 59 Louisiana cities in this dataset, Zachary ranks 20 for seismic hazard, the 67th percentile within the state. About 20,370 people live in Zachary, Louisiana.

Bracing and bolting: the actual cost

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

More on how this number was built

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