Does Chandler, AZ need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Chandler in Seismic Design Category B: 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 Chandler sits at the 50th percentile for seismic hazard among 4,875 US cities.

Where Chandler sits in Arizona

USGS's underlying values for Chandler: 0.078g peak ground acceleration, 0.177g at short period, 0.064g at 1 second. Within Arizona alone, Chandler ranks 49 of 57 cities by seismic hazard - the 14th percentile in-state. Chandler has a population of about 281,231.

What a retrofit costs in Chandler

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Arizona specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Arizona.

Insuring against this, not just retrofitting

A Chandler homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Chandler's figures come from

Chandler's Category B and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category B does and doesn't tell you about Chandler.