Macclenny, FL: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Macclenny is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Macclenny in the 27th percentile nationally for seismic hazard - higher than 27% of the 4,875 US cities USGS was checked against here.

How Macclenny compares

USGS's underlying values for Macclenny: 0.046g peak ground acceleration, 0.095g at short period, 0.053g at 1 second. Within Florida alone, Macclenny ranks 7 of 228 cities by seismic hazard - the 97th percentile in-state. Macclenny has a population of about 8,178.

What a retrofit costs in Macclenny

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 Florida 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 Florida.

What this means for insurance

A Macclenny 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 Macclenny's figures come from

Macclenny'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 Macclenny.