Does Little Falls, MN need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Little Falls in Seismic Design Category A: Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. That puts Little Falls in the 9th percentile nationally for seismic hazard - higher than 9% of the 4,875 US cities USGS was checked against here.

Little Falls by the numbers

USGS's underlying values for Little Falls: 0.027g peak ground acceleration, 0.057g at short period, 0.019g at 1 second. Within Minnesota alone, Little Falls ranks 11 of 155 cities by seismic hazard - the 94th percentile in-state. Little Falls has a population of about 9,206.

What a retrofit costs in Little Falls

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.

Insuring against this, not just retrofitting

A Little Falls 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 Little Falls's figures come from

Little Falls'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 Little Falls.