Does Harrisville, UT need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Harrisville in Seismic Design Category D: High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. Nationally, Harrisville ranks above 95% of the 4,875 cities in this dataset for seismic hazard - the 95th percentile.

Where Harrisville sits in Utah

USGS's underlying values for Harrisville: 0.662g peak ground acceleration, 1.463g at short period, 0.534g at 1 second. Within Utah alone, Harrisville ranks 14 of 95 cities by seismic hazard - the 86th percentile in-state. Harrisville has a population of about 6,947.

Retrofit economics for Harrisville

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 Utah 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 Utah.

Earthquake insurance for a Harrisville home

A Harrisville 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 Harrisville's figures come from

Harrisville's Category D 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 D does and doesn't tell you about Harrisville.