Does Washington, PA need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Washington is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Washington ranks above 24% of the 4,875 cities in this dataset for seismic hazard - the 24th percentile.

How Washington compares

The raw figures: peak ground acceleration 0.043g, short-period spectral response 0.09g, 1-second spectral response 0.046g. Among 193 Pennsylvania cities in this dataset, Washington ranks 124 for seismic hazard, the 36th percentile within the state. About 13,334 people live in Washington, Pennsylvania.

What a retrofit costs in Washington

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

Earthquake insurance for a Washington 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 Washington address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Washington'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.