Does St. Michael, MN need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, St. Michael is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and St. Michael sits at the 5th percentile for seismic hazard among 4,875 US cities.

How St. Michael compares

USGS's underlying values for St. Michael: 0.023g peak ground acceleration, 0.049g at short period, 0.024g at 1 second. Within Minnesota alone, St. Michael ranks 67 of 155 cities by seismic hazard - the 57th percentile in-state. St. Michael has a population of about 21,681.

What a retrofit costs in St. Michael

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 Minnesota 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 Minnesota.

What this means for insurance

A St. Michael 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 St. Michael's figures come from

St. Michael's Category A 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 A does and doesn't tell you about St. Michael.