Does Avondale, AZ need an earthquake retrofit?

Avondale 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. That puts Avondale in the 47th percentile nationally for seismic hazard - higher than 47% of the 4,875 US cities USGS was checked against here.

How Avondale compares

The raw figures: peak ground acceleration 0.072g, short-period spectral response 0.166g, 1-second spectral response 0.072g. Among 57 Arizona cities in this dataset, Avondale ranks 56 for seismic hazard, the 2th percentile within the state. About 96,609 people live in Avondale, Arizona.

Bracing and bolting: the actual cost

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.

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 Avondale address.

More on how this number was built

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