Does Pleasant Hill, IA need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Pleasant Hill is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Pleasant Hill ranks above 16% of the 4,875 cities in this dataset for seismic hazard - the 16th percentile.

How Pleasant Hill compares

USGS's underlying values for Pleasant Hill: 0.03g peak ground acceleration, 0.062g at short period, 0.052g at 1 second. Within Iowa alone, Pleasant Hill ranks 44 of 85 cities by seismic hazard - the 49th percentile in-state. Pleasant Hill has a population of about 11,942.

What a retrofit costs in Pleasant Hill

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.

Insuring against this, not just retrofitting

A Pleasant Hill 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 Pleasant Hill's figures come from

Pleasant Hill'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 Pleasant Hill.