How much flood risk does Anderson County actually carry?
Anderson County lands at the 88.1th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.5 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in Anderson County
Out of 265 homes FEMA counts inside Anderson County's mapped flood zone, 56 carry the flood policy federal law requires there — 21.1% compliance, short of full coverage. Across all residential structures in Anderson County, not just the ones FEMA mandates, 0.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Anderson County ranks
Anderson County sits at rank 393 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 328 of 3144 by population (1 is biggest). About 217,183 people live in Anderson County, South Carolina, spread over 713.854 square miles.
Checking a specific address in Anderson County
Across all of Anderson County's 80,440 residential structures, 118 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Anderson County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.