Royse City's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Royse City in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Royse City in the 31th percentile nationally for seismic hazard - higher than 31% of the 4,875 US cities USGS was checked against here.

Royse City by the numbers

USGS's underlying values for Royse City: 0.052g peak ground acceleration, 0.109g at short period, 0.058g at 1 second. Within Texas alone, Royse City ranks 77 of 384 cities by seismic hazard - the 80th percentile in-state. Royse City has a population of about 26,387.

Retrofit economics for Royse City

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.

Insuring against this, not just retrofitting

A Royse City 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 Royse City's figures come from

Royse City'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 Royse City.