Round Lake, IL: what USGS's seismic model says

Round Lake 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 Round Lake in the 31th percentile nationally for seismic hazard - higher than 31% of the 4,875 US cities USGS was checked against here.

Round Lake by the numbers

The raw figures: peak ground acceleration 0.052g, short-period spectral response 0.104g, 1-second spectral response 0.057g. Among 330 Illinois cities in this dataset, Round Lake ranks 301 for seismic hazard, the 9th percentile within the state. About 18,654 people live in Round Lake, 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.

Earthquake insurance for a Round Lake 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 Round Lake address.

More on how this number was built

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