Enter any address in Manassas city, Virginia to see its FEMA flood zone
Flash flooding from slow-moving thunderstorms is a recurring event in Manassas City County, VA. Over the past 30 years, NOAA Storm Events data shows 9 instances of flash flooding and 7 instances of general flooding. For example, the remnants of Hurricane Ida brought widespread flooding and flash flooding to the area on September 1, 2021, following heavy rainfall. Similarly, slow-moving showers and thunderstorms caused flooding and flash flooding on August 12 and 13, 2020.
National Flood Insurance Program (NFIP) claims data indicates that while Zone A properties have experienced higher average payouts and water depths, Zone X properties have also seen a significant number of claims. Homeowners in areas designated as Zone X, particularly those with lower elevations or located near potential drainage paths, should pay close attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
2 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Manassas city, Virginia has recorded 16 flood-related events since 1996 according to NOAA's Storm Events Database, including 9 flash floods and 7 river or area floods. The county has received 15 federal disaster declarations. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1993–2026)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Winter Storm | Winter Storm | Jan 22, 2026 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Hurricane Florence | Hurricane | Sep 13, 2018 |
| Severe Winter Storm And Snowstorm | Snowstorm | Jan 22, 2016 |
| Hurricane Sandy | Hurricane | Oct 26, 2012 |
| Severe Winter Storms And Snowstorms | Snowstorm | Feb 5, 2010 |
| Severe Winter Storm And Snowstorm | Snowstorm | Dec 18, 2009 |
| Hurricane Katrina Evacuation | Hurricane | Aug 29, 2005 |
| Hurricane Isabel | Hurricane | Sep 18, 2003 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Sep 1, 2021 | 0.00K |
| Flood | Aug 13, 2020 | 0.00K |
| Flash Flood | Aug 12, 2020 | 0.00K |
| Flood | Aug 1, 2018 | 0.00K |
| Flood | Apr 30, 2014 | 0.00K |
| Flash Flood | May 16, 2011 | 0.00K |
| Flash Flood | Sep 8, 2011 | 0.00K |
| Flash Flood | May 6, 2009 | 0.00K |
| Flood | May 12, 2008 | 20.00K |
| Flood | May 9, 2008 | 0.00K |
Flood — Sep 1, 2021
The remnants of Ida produced widespread flooding along with instances of flash flooding across the area. Tropical moisture infiltrated the area and there were moderate amounts of instability as well. This combined with the lift provided from the remnants of Ida led to heavy rainfall during this time. Rainfall amounts averaged around 1-3 near and east of Interstate 95, with amounts around 2 to 5...
Flood — Aug 13, 2020
Showers and thunderstorms developed, and with little steering flow aloft this caused the storm motion to be slow. The slow storm motion resulted in instances of flooding and flash flooding.
Flash Flood — Aug 12, 2020
Showers and thunderstorms developed, and with little steering flow aloft this caused the storm motion to be slow. The slow storm motion resulted in instances of flooding and flash flooding.
Flood — Aug 1, 2018
A southerly flow pumped in plenty of moisture from the Atlantic while a slow moving cold front approached from the west. Copious amounts of moisture ahead of the boundary led to showers and thunderstorms. Torrential downpours combined with convection training over the same areas led to flooding.
Flood — Apr 30, 2014
The eastern half of the United States was under cyclonic flow and moisture from the Atlantic and Gulf continued to move into the Mid Atlantic. A warm front moved northward and showers and thunderstorms broke out across the area. Heavy rain produced flash flooding and rapid rises on streams and creeks.
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 Manassas city, Virginia:
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 Manassas city, Virginia 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.