Lake in the Hills's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Lake in the Hills is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Lake in the Hills in the 37th percentile nationally for seismic hazard - higher than 37% of the 4,875 US cities USGS was checked against here.

Where Lake in the Hills sits in Illinois

The raw figures: peak ground acceleration 0.06g, short-period spectral response 0.117g, 1-second spectral response 0.06g. Among 330 Illinois cities in this dataset, Lake in the Hills ranks 239 for seismic hazard, the 28th percentile within the state. About 28,706 people live in Lake in the Hills, Illinois.

Retrofit economics for Lake in the 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.

Earthquake insurance for a Lake in the Hills home

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 Lake in the Hills address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Lake in the 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.