South Milwaukee's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places South Milwaukee in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts South Milwaukee in the 20th percentile nationally for seismic hazard - higher than 20% of the 4,875 US cities USGS was checked against here.

Where South Milwaukee sits in Wisconsin

USGS's underlying values for South Milwaukee: 0.038g peak ground acceleration, 0.078g at short period, 0.049g at 1 second. Within Wisconsin alone, South Milwaukee ranks 34 of 157 cities by seismic hazard - the 79th percentile in-state. South Milwaukee has a population of about 20,233.

What a retrofit costs in South Milwaukee

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 Wisconsin 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 Wisconsin.

What this means for insurance

A South Milwaukee 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 South Milwaukee's figures come from

South Milwaukee'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 South Milwaukee.