Colleyville's Seismic Design Category, explained

Colleyville 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 Colleyville sits at the 29th percentile for seismic hazard among 4,875 US cities.

Colleyville by the numbers

USGS's underlying values for Colleyville: 0.048g peak ground acceleration, 0.1g at short period, 0.053g at 1 second. Within Texas alone, Colleyville ranks 96 of 384 cities by seismic hazard - the 75th percentile in-state. Colleyville has a population of about 26,012.

What a retrofit costs in Colleyville

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 Colleyville home

A Colleyville 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 Colleyville's figures come from

Colleyville'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 Colleyville.