Adel's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Adel in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Adel in the 16th percentile nationally for seismic hazard - higher than 16% of the 4,875 US cities USGS was checked against here.

Where Adel sits in Iowa

USGS's underlying values for Adel: 0.029g peak ground acceleration, 0.061g at short period, 0.05g at 1 second. Within Iowa alone, Adel ranks 55 of 85 cities by seismic hazard - the 36th percentile in-state. Adel has a population of about 6,763.

What a retrofit costs in Adel

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 Iowa 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 Iowa.

Earthquake insurance for a Adel home

A Adel 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 Adel's figures come from

Adel'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 Adel.