Does Douglas, AZ need an earthquake retrofit?

Douglas carries Seismic Design Category C under USGS's ASCE 7-16 model. Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. Rank it against the rest of the country and Douglas sits at the 72th percentile for seismic hazard among 4,875 US cities.

Douglas by the numbers

USGS's underlying values for Douglas: 0.127g peak ground acceleration, 0.287g at short period, 0.087g at 1 second. Within Arizona alone, Douglas ranks 13 of 57 cities by seismic hazard - the 79th percentile in-state. Douglas has a population of about 15,819.

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.

What this means for insurance

A Douglas 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 Douglas's figures come from

Douglas's Category C 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 C does and doesn't tell you about Douglas.