Ponchatoula's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Ponchatoula in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Ponchatoula in the 24th percentile nationally for seismic hazard - higher than 24% of the 4,875 US cities USGS was checked against here.

Where Ponchatoula sits in Louisiana

The raw figures: peak ground acceleration 0.043g, short-period spectral response 0.089g, 1-second spectral response 0.058g. Among 59 Louisiana cities in this dataset, Ponchatoula ranks 26 for seismic hazard, the 57th percentile within the state. About 7,735 people live in Ponchatoula, Louisiana.

What a retrofit costs in Ponchatoula

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 Ponchatoula address.

More on how this number was built

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