Does Lake Villa, IL need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Lake Villa in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Lake Villa ranks above 30% of the 4,875 cities in this dataset for seismic hazard - the 30th percentile.

How Lake Villa compares

The raw figures: peak ground acceleration 0.05g, short-period spectral response 0.1g, 1-second spectral response 0.056g. Among 330 Illinois cities in this dataset, Lake Villa ranks 313 for seismic hazard, the 5th percentile within the state. About 8,737 people live in Lake Villa, 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.

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 Lake Villa address.

More on how this number was built

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