Does Hartford, WI need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Hartford is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Hartford in the 17th percentile nationally for seismic hazard - higher than 17% of the 4,875 US cities USGS was checked against here.

Where Hartford sits in Wisconsin

USGS's underlying values for Hartford: 0.033g peak ground acceleration, 0.069g at short period, 0.045g at 1 second. Within Wisconsin alone, Hartford ranks 81 of 157 cities by seismic hazard - the 49th percentile in-state. Hartford has a population of about 15,984.

What a retrofit costs in Hartford

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.

Insuring against this, not just retrofitting

A Hartford 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 Hartford's figures come from

Hartford'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 Hartford.