Does Carrollton, TX need an earthquake retrofit?

Carrollton 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 Carrollton in the 31th percentile nationally for seismic hazard - higher than 31% of the 4,875 US cities USGS was checked against here.

How Carrollton compares

USGS's underlying values for Carrollton: 0.052g peak ground acceleration, 0.106g at short period, 0.055g at 1 second. Within Texas alone, Carrollton ranks 73 of 384 cities by seismic hazard - the 81th percentile in-state. Carrollton has a population of about 135,456.

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 Texas 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 Texas.

Earthquake insurance for a Carrollton home

A Carrollton 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 Carrollton's figures come from

Carrollton'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 Carrollton.