Piedmont, CA: what USGS's seismic model says

USGS's ASCE 7-16 seismic model can't even fit Piedmont onto its standard code table - ground motion here (peak ground acceleration 0.927g) is past what the table covers, which under §11.4.8 means a site-specific geotechnical study, not a standard letter grade. Nationally, Piedmont ranks above 99% of the 4,875 cities in this dataset for seismic hazard - the 99th percentile.

How Piedmont compares

USGS's underlying values for Piedmont: 0.927g peak ground acceleration, 2.206g at short period, 0.852g at 1 second. Within California alone, Piedmont ranks 34 of 429 cities by seismic hazard - the 92th percentile in-state. Piedmont has a population of about 10,816.

Bracing and bolting: the actual cost

Cripple-wall bracing and foundation bolting - the scope California's Earthquake Brace + Bolt (EBB) grant funds - typically runs $3,000-$7,000 nationally. Every qualifying household gets a $3,000 base grant, which brings that down to $0-$4,000 out of pocket; income-eligible households ($89,040/year or under) can get up to $10,000 total, covering the retrofit outright in most cases.

What this means for insurance

Piedmont sits in CEA territory, but CEA earthquake coverage is agent-sold only, never direct - so the real first step for a homeowner here is a standard home-insurance quote, then asking that agent about CEA specifically.

Where Piedmont's figures come from

Piedmont's Category rating and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. Full Brace + Bolt eligibility rules - beyond what this page can check from a ZIP code alone - are in the retrofit cost and grant guide.