Bradley, IL: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Bradley in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Bradley ranks above 40% of the 4,875 cities in this dataset for seismic hazard - the 40th percentile.

Bradley by the numbers

USGS's underlying values for Bradley: 0.064g peak ground acceleration, 0.13g at short period, 0.072g at 1 second. Within Illinois alone, Bradley ranks 157 of 330 cities by seismic hazard - the 53th percentile in-state. Bradley has a population of about 15,298.

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 Illinois 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 Illinois.

Insuring against this, not just retrofitting

A Bradley 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 Bradley's figures come from

Bradley'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 Bradley.