Leominster's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Leominster is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Leominster ranks above 63% of the 4,875 cities in this dataset for seismic hazard - the 63th percentile.

How Leominster compares

USGS's underlying values for Leominster: 0.167g peak ground acceleration, 0.28g at short period, 0.068g at 1 second. Within Massachusetts alone, Leominster ranks 20 of 58 cities by seismic hazard - the 67th percentile in-state. Leominster has a population of about 44,209.

Retrofit economics for Leominster

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 Massachusetts 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 Massachusetts.

What this means for insurance

A Leominster 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 Leominster's figures come from

Leominster's Category B 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 B does and doesn't tell you about Leominster.