Berkeley County, SC flood risk explained
Flood hazard in Berkeley County sits at the 80.7th national percentile, a middling flood hazard by national standards; split between inland river flooding (about 1.6 times a year) and coastal storm surge (about 3.6 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 Berkeley County
Homes with a federally backed mortgage inside Berkeley County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 81.7% of them do — 3,163 active policies against 3,874 structures FEMA counts in that zone, leaving a real compliance gap. Looking beyond the mandated zone, 7.2% of all residential structures in Berkeley County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Berkeley County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Berkeley County ranks 632 — 1 being the highest hazard nationally — and 278 by population among all 3144 counties covered here, where 1 is the largest. Berkeley County, South Carolina covers 1,103.61 square miles and counts roughly 264,276 residents.
What to do next if you own or are buying in Berkeley County
FEMA counts 80,127 residential structures in Berkeley County overall, 5,749 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Berkeley County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Berkeley County's coastal exposure is covered in the coastal vs. inland flood risk guide, including how storm surge risk differs from river flooding.