Does Dallas, NC need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Dallas in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Dallas ranks above 57% of the 4,875 cities in this dataset for seismic hazard - the 57th percentile.

How Dallas compares

USGS's underlying values for Dallas: 0.105g peak ground acceleration, 0.204g at short period, 0.082g at 1 second. Within North Carolina alone, Dallas ranks 41 of 147 cities by seismic hazard - the 73th percentile in-state. Dallas has a population of about 6,270.

What a retrofit costs in Dallas

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 North Carolina 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 North Carolina.

Earthquake insurance for a Dallas home

A Dallas 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 Dallas's figures come from

Dallas'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 Dallas.