Enter any address in Lancaster County, South Carolina to see its FEMA flood zone
Flash flooding from slow-moving thunderstorms is the most frequent type of flood event in Lancaster County, SC, with 62 occurrences recorded in the NOAA Storm Events Database over the last 30 years. These events are often caused by atmospheric conditions that lead to heavy rainfall over a localized area. For example, on July 9, 2025, an upper trough contributed to strong convection and efficient rainfall, resulting in flash flooding. Tropical Storm Helene also impacted the region on September 27, 2024, bringing significant wind damage.
National Flood Insurance Program (NFIP) claims data shows that properties in Zone A have experienced the highest number of claims, with an average payout of $15,123 and an average water depth of 3.7 feet. While Zone X_UNSHADED has fewer claims, the average payout is comparable at $13,376, though with a lower average water depth of 1.4 feet. Residents in Zone A, and those in areas with lower flood protection standards or without a Base Flood Elevation (BFE), should pay particular attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
28 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Lancaster County, South Carolina has recorded 73 flood-related events since 1996 according to NOAA's Storm Events Database, including 62 flash floods and 7 river or area floods. The county has received 24 federal disaster declarations, 2 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1977–2026)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Winter Storm | Winter Storm | Jan 21, 2026 |
| Hurricane Helene | Tropical Storm | Sep 25, 2024 |
| Hurricane Debby | Tropical Storm | Aug 4, 2024 |
| Hurricane Idalia | Hurricane | Aug 29, 2023 |
| Hurricane Ian | Hurricane | Sep 25, 2022 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Hurricane Dorian | Hurricane | Aug 31, 2019 |
| Hurricane Florence | Hurricane | Sep 8, 2018 |
| Hurricane Irma | Hurricane | Sep 6, 2017 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jul 9, 2025 | 0.00K |
| Tropical Storm | Sep 27, 2024 | 200.00K |
| Tropical Storm | Sep 27, 2024 | 300.00K |
| Flash Flood | Jan 9, 2024 | 20.00K |
| Flash Flood | Jan 9, 2024 | 1.00K |
| Flash Flood | Jan 9, 2024 | 2.00K |
| Flash Flood | Aug 8, 2024 | 0.00K |
| Flash Flood | Jul 7, 2024 | 0.00K |
| Tropical Storm | Sep 30, 2022 | — |
| Flood | May 29, 2020 | 0.10K |
Flash Flood — Jul 9, 2025
An upper trough moved into the Southeast, acting as the main forcing in a strongly unstable environment with weak deep layer shear and high PWAT's. This forcing led to the development of scattered strong to severe convection that moved slowly due to the weak steering flow. The slow moving nature and efficient rainfall from these storms led to an area of flash flooding in Lancaster County, SC.
Tropical Storm — Sep 27, 2024
Tropical Storm Helene formed in the NW Caribbean Sea on September 24. Helene moved northward into the Gulf of Mexico where it strengthened into a hurricane on September 25. Helene made landfall as a major hurricane in the Big Bend area of Florida the night of September 26 before quickly moving inland into east central Georgia by early morning on September 27. Helene weakened to a strong tropica...
Flash Flood — Jan 9, 2024
Strong upper level and surface areas of low pressure moved NE into the Midwest, while a cold front along with a secondary weak low, formed and moved through the area. Gradient wind gusts, along with enhanced wind gusts associated with severe thunderstorms and a strong low level jet, resulted in widespread tree damage.
Flash Flood — Aug 8, 2024
Heavy rainfall associated with Tropical Storm Debby occurred across South Carolina for several days resulting in areas of flash flooding. There was also an isolated severe thunderstorm on the 6th.
Flash Flood — Jul 7, 2024
A cluster of thunderstorms developed along a weakening frontal boundary in the Upstate. The storms held together into the central Midlands, causing flash flooding in the north central Midlands.
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Lancaster County, South Carolina:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Lancaster County, South Carolina that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.