Does Phillipsburg, NJ need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Phillipsburg is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Phillipsburg in the 57th percentile nationally for seismic hazard - higher than 57% of the 4,875 US cities USGS was checked against here.

How Phillipsburg compares

The raw figures: peak ground acceleration 0.106g, short-period spectral response 0.19g, 1-second spectral response 0.05g. Among 194 New Jersey cities in this dataset, Phillipsburg ranks 156 for seismic hazard, the 20th percentile within the state. About 15,393 people live in Phillipsburg, New Jersey.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for New Jersey. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Earthquake insurance for a Phillipsburg home

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Phillipsburg address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Phillipsburg's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.