Vernon Hills, IL: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Vernon Hills is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Vernon Hills ranks above 32% of the 4,875 cities in this dataset for seismic hazard - the 32th percentile.

Vernon Hills by the numbers

USGS's underlying values for Vernon Hills: 0.054g peak ground acceleration, 0.108g at short period, 0.058g at 1 second. Within Illinois alone, Vernon Hills ranks 284 of 330 cities by seismic hazard - the 14th percentile in-state. Vernon Hills has a population of about 27,002.

Bracing and bolting: the actual cost

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Illinois specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Illinois.

What this means for insurance

A Vernon Hills homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Vernon Hills's figures come from

Vernon Hills's Category B and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category B does and doesn't tell you about Vernon Hills.