Does Milan, IL need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Milan is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Milan sits at the 26th percentile for seismic hazard among 4,875 US cities.

Milan by the numbers

USGS's underlying values for Milan: 0.046g peak ground acceleration, 0.096g at short period, 0.066g at 1 second. Within Illinois alone, Milan ranks 329 of 330 cities by seismic hazard - the 0th percentile in-state. Milan has a population of about 5,033.

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.

Insuring against this, not just retrofitting

A Milan 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 Milan's figures come from

Milan'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 Milan.