Does Newton, IA need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Newton in Seismic Design 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 Newton sits at the 17th percentile for seismic hazard among 4,875 US cities.

Where Newton sits in Iowa

The raw figures: peak ground acceleration 0.03g, short-period spectral response 0.063g, 1-second spectral response 0.054g. Among 85 Iowa cities in this dataset, Newton ranks 42 for seismic hazard, the 51th percentile within the state. About 15,709 people live in Newton, Iowa.

Retrofit economics for Newton

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

Earthquake insurance for a Newton 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 Newton address.

More on how this number was built

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