Casa Grande, AZ: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Casa Grande is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Casa Grande ranks above 49% of the 4,875 cities in this dataset for seismic hazard - the 49th percentile.

Where Casa Grande sits in Arizona

The raw figures: peak ground acceleration 0.077g, short-period spectral response 0.175g, 1-second spectral response 0.065g. Among 57 Arizona cities in this dataset, Casa Grande ranks 51 for seismic hazard, the 11th percentile within the state. About 68,927 people live in Casa Grande, Arizona.

Retrofit economics for Casa Grande

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

Earthquake insurance for a Casa Grande 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 Casa Grande address.

More on how this number was built

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