Flossmoor, IL: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Flossmoor in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Flossmoor ranks above 38% of the 4,875 cities in this dataset for seismic hazard - the 38th percentile.

Where Flossmoor sits in Illinois

The raw figures: peak ground acceleration 0.062g, short-period spectral response 0.125g, 1-second spectral response 0.067g. Among 330 Illinois cities in this dataset, Flossmoor ranks 212 for seismic hazard, the 36th percentile within the state. About 9,371 people live in Flossmoor, Illinois.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Illinois. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Insuring against this, not just retrofitting

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Flossmoor address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Flossmoor's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.