Does Leonia, NJ need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Leonia is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Leonia sits at the 66th percentile for seismic hazard among 4,875 US cities.

Leonia by the numbers

USGS's underlying values for Leonia: 0.184g peak ground acceleration, 0.296g at short period, 0.061g at 1 second. Within New Jersey alone, Leonia ranks 22 of 194 cities by seismic hazard - the 89th percentile in-state. Leonia has a population of about 9,492.

Bracing and bolting: the actual cost

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 New Jersey 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 New Jersey.

Earthquake insurance for a Leonia home

A Leonia 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 Leonia's figures come from

Leonia'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 Leonia.