Grand Forks's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Grand Forks in Seismic Design Category A: Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Grand Forks ranks above 2% of the 4,875 cities in this dataset for seismic hazard - the 2th percentile.

How Grand Forks compares

USGS's underlying values for Grand Forks: 0.021g peak ground acceleration, 0.045g at short period, 0.017g at 1 second. Within North Dakota alone, Grand Forks ranks 13 of 14 cities by seismic hazard - the 8th percentile in-state. Grand Forks has a population of about 59,845.

What a retrofit costs in Grand Forks

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 North 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 North Dakota.

What this means for insurance

A Grand Forks 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 Grand Forks's figures come from

Grand Forks'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 Grand Forks.