Union County, SC flood risk explained
Flood hazard in Union County sits at the 53.4th national percentile, below the national norm for flood hazard; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 2 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Union County's flood-insurance compliance gap
0% of the homes FEMA requires to carry flood insurance in Union County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 0 policies against 43 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 0% of all residential structures in Union County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Union County ranks
Among the 3144 US counties FEMA scores for flood hazard, Union County ranks 1528 — 1 being the highest hazard nationally — and 1551 by population among all 3144 counties covered here, where 1 is the largest. Union County, South Carolina covers 513.604 square miles and counts roughly 26,678 residents.
Your street may differ from Union County's average
FEMA counts 16,773 residential structures in Union County overall, 1 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Union 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.