Lancaster County, SC flood risk explained
Flood hazard in Lancaster County sits at the 81.3th national percentile, a middling flood hazard by national standards; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Who actually carries the flood insurance FEMA requires
Out of 168 homes FEMA counts inside Lancaster County's mapped flood zone, 44 carry the flood policy federal law requires there — 26.2% compliance, short of full coverage. Looking beyond the mandated zone, 0.4% of all residential structures in Lancaster County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Lancaster County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Lancaster County ranks 615 — 1 being the highest hazard nationally — and 573 by population among all 3144 counties covered here, where 1 is the largest. About 111,652 people live in Lancaster County, South Carolina, spread over 549.172 square miles.
What to do next if you own or are buying in Lancaster County
Across all of Lancaster County's 38,877 residential structures, 155 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Lancaster County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.