ZIP 21817
Somerset County, MD

The heaviest year

2012 is the heaviest year on file: 466 paid claims, 58.5% of the ZIP's total. More than half of everything ever paid here traces to that single year. The largest named event in the record is Hurricane Sandy, with 461 claims.

92 of those claims — 11.6% — were filed since 2017. The bulk of this ZIP's record is older than that.

Named event	Paid claims	Share of record
Hurricane Sandy	461	57.9%
Hurricane Floyd	69	8.7%
Hurricane Isabel	59	7.4%

Where the claims sat on the map

Of the 792 claims here that record a rated flood zone, 26 — 3.3% — were on properties rated outside the mapped high-risk area, in a B, C or X zone. Claims here concentrate inside the mapped high-risk area, which is what the maps intend. Flood insurance is not required outside the high-risk zone, and most properties there do not carry it — so these counts come from the minority who did.

The water near this ZIP

The closest gauges publishing official flood thresholds are Chesapeake Bay above Little Annemessex River at Crisfield MD (MLLW) (1.5 mi), Chesapeake Bay near Starling Creek at Saxis (IN MLLW) (7.3 mi) and Chesapeake Bay at Port Isobel/Tangier Island (IN MLLW) (12.8 mi). A gauge describes one point on one river — it will not see street drainage, sewer backup, storm surge or flash flooding.

Read current gauge conditions for 21817 →

What this does not say

These are paid National Flood Insurance Program claims, nothing more. They count insured properties whose owners filed and were paid, so they are a floor on how often this ZIP has flooded — never a measure of how likely it is to flood next. Uninsured flooding leaves no trace here at all.

The figures are aggregates published by FEMA. No individual claim, address or policyholder appears on this page or in the data behind it. Nothing here is a forecast, a warning, or advice about insurance.