Macomb, IL: what USGS's seismic model says

Macomb 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. Nationally, Macomb ranks above 35% of the 4,875 cities in this dataset for seismic hazard - the 35th percentile.

Where Macomb sits in Illinois

USGS's underlying values for Macomb: 0.057g peak ground acceleration, 0.122g at short period, 0.077g at 1 second. Within Illinois alone, Macomb ranks 265 of 330 cities by seismic hazard - the 20th percentile in-state. Macomb has a population of about 14,765.

Retrofit economics for Macomb

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 Macomb home

A Macomb 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 Macomb's figures come from

Macomb'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 Macomb.