Does Vermillion, SD need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Vermillion in Seismic Design Category A: Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Vermillion ranks above 15% of the 4,875 cities in this dataset for seismic hazard - the 15th percentile.

Where Vermillion sits in South Dakota

USGS's underlying values for Vermillion: 0.049g peak ground acceleration, 0.098g at short period, 0.039g at 1 second. Within South Dakota alone, Vermillion ranks 11 of 18 cities by seismic hazard - the 41th percentile in-state. Vermillion has a population of about 11,877.

What a retrofit costs in Vermillion

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 South Dakota 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 South Dakota.

Earthquake insurance for a Vermillion home

A Vermillion 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 Vermillion's figures come from

Vermillion'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 Vermillion.