Danville's Seismic Design Category, explained

Danville carries Seismic Design Category C under USGS's ASCE 7-16 model. Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. Rank it against the rest of the country and Danville sits at the 68th percentile for seismic hazard among 4,875 US cities.

How Danville compares

USGS's underlying values for Danville: 0.081g peak ground acceleration, 0.169g at short period, 0.088g at 1 second. Within Illinois alone, Danville ranks 62 of 330 cities by seismic hazard - the 81th percentile in-state. Danville has a population of about 27,981.

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.

Earthquake insurance for a Danville home

A Danville 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 Danville's figures come from

Danville's Category C 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 C does and doesn't tell you about Danville.