Does Hickory Hills, IL need an earthquake retrofit?

Hickory Hills 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 Hickory Hills in the 40th percentile nationally for seismic hazard - higher than 40% of the 4,875 US cities USGS was checked against here.

Hickory Hills by the numbers

The raw figures: peak ground acceleration 0.064g, short-period spectral response 0.127g, 1-second spectral response 0.066g. Among 330 Illinois cities in this dataset, Hickory Hills ranks 158 for seismic hazard, the 52th percentile within the state. About 14,118 people live in Hickory Hills, Illinois.

What a retrofit costs in Hickory Hills

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.

What this means for insurance

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 Hickory Hills address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Hickory Hills'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.