Does Gilbert, AZ need an earthquake retrofit?

Gilbert 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 Gilbert sits at the 51th percentile for seismic hazard among 4,875 US cities.

Where Gilbert sits in Arizona

USGS's underlying values for Gilbert: 0.082g peak ground acceleration, 0.187g at short period, 0.066g at 1 second. Within Arizona alone, Gilbert ranks 44 of 57 cities by seismic hazard - the 23th percentile in-state. Gilbert has a population of about 288,790.

Bracing and bolting: the actual cost

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 Gilbert 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 Gilbert's figures come from

Gilbert'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 Gilbert.