1,142 flood insurance claims·$20.2M paid·5 federal flood & hurricane disasters
Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.
Shaded areas are FEMA’s mapped flood hazard zones in and around Dorchester County, Maryland. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.
Coastal flooding dominates the flood character of Dorchester County, accounting for 52 of the 95 recorded flood events in the last 30 years, alongside flash floods, tropical storms, and hurricanes. Prolonged northeasterly onshore flow and persistent winds drive this tidal inundation, as seen during moderate to locally major coastal flooding events in October 2025. Heavy rainfall from slow-moving summer convection also triggers flash flooding, such as the event driven by deep moisture and strong surface heating in July 2025.
National Flood Insurance Program records indicate that high-risk Special Flood Hazard Areas bear the heaviest financial impact. Zone A properties have experienced 1,070 claims with an average payout of $21,961 and an average recorded water depth of 7 inches. Moderate- and low-risk zones have recorded fewer claims, including 29 claims in Zone X Shaded with an average payout of $19,828 and an average recorded water depth of 9 inches, and 25 claims in Zone X with an average payout of $10,681 and an average recorded water depth of 6 inches. Zone Unknown recorded 9 claims with an average payout of $3,127 and an average water depth of 2 inches, while Zone X Unshaded recorded 7 claims with an average payout of $9,936 and an average water depth of 7 inches.
Homeowners and real estate agents with properties in Zone A should pay the most attention to flood risk, given the heavy concentration of claims in that zone.
Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.
3% of Dorchester County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.
1,108 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.
In flood insurance claims here that reported a flood depth, the average was 7 inches.
Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.
Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.
The worst year was 2003, with 706 claims and $14.4M paid, the year of Snow and Hurricane Isabel.
Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.
31 NOAA storm reports from Dorchester County describe what happened, in the words of the forecasters who covered it. Read the Maryland flood stories →
20 federal disaster declarations since 1972, 5 of them floods, coastal storms or hurricanes.
| Disaster | Began |
|---|---|
| Severe Winter Storm | Jan 23, 2026 |
| Tropical Storm Isaias | Aug 3, 2020 |
| Hurricane Sandy | Oct 26, 2012 |
| Hurricane Irene | Aug 26, 2011 |
| Severe Winter Storms And Snowstorms | Feb 5, 2010 |
| Severe Storms, Flooding, And Tornadoes | Jun 22, 2006 |
| Hurricane Katrina Evacuation | Aug 29, 2005 |
| Hurricane Isabel | Sep 18, 2003 |
Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.
95 since 1996: 24 flash floods, 8 river or area floods and 52 coastal floods or surges.
| Event | Date | Damage |
|---|---|---|
| Coastal Flood | Oct 29, 2025 | — |
| Coastal Flood | Aug 21, 2025 | — |
| Flash Flood | Jul 19, 2025 | — |
| Coastal Flood | Oct 18, 2025 | — |
| Coastal Flood | Oct 12, 2025 | — |
| Coastal Flood | Sep 27, 2024 | — |
| Coastal Flood | Mar 27, 2024 | — |
| Coastal Flood | Mar 26, 2024 | — |
— = no damage estimate in the record. Source: NOAA Storm Events Database.
Coastal Flood · Oct 29, 2025. Low pressure off the Mid-Atlantic coast combined with high pressure in Canada, resulting in a lengthy period of northeasterly onshore flow. Increasing tidal anomalies resulted in moderate to locally major tidal flooding over an extended period.
Coastal Flood · Aug 21, 2025. Hurricane Erin passed well offshore and combined with high pressure to the north, resulting in a period of strong onshore winds and coastal flooding across the Lower Maryland Eastern Shore.
Flash Flood · Jul 19, 2025. A stationary front was anchored north of the area in Pennsylvania. Deep moisture was in place to the south of the front with precipitable water values near two inches. Strong surface heating resulted in robust instability with wind shear around 25 knots, allowing for deep, slow moving, convection capable of heavy rainfall and flash flooding during the afternoon and evening hours.
Coastal Flood · Oct 18, 2025. South and southwesterly winds developed ahead of a strong cold front. Winds became westerly behind the front, allowing water trapped in the middle Chesapeake Bay to flood portions of the Maryland Eastern Shore.
National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.
Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.
If a building in Dorchester County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.
Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.