Public Works and Environmental Services

Fairfax County, Virginia

CONTACT INFORMATION: Our administrative offices are open to the public by appointment only at this time. Please call or email 8 a.m. – 4:30 p.m., Monday - Friday

TTY 711

12000 Government Center Parkway
Suite 449, Fairfax, Va 22035

Craig Carinci,
Director, Stormwater Planning

Flood Information

What can I do to protect my property?

Residents can help protect their property from the effects of flooding through such measures as regrading the lot, waterproofing the structure or raising the level of the building. Information about protecting buildings is available at FEMA's Safer, Stronger, Protected Homes & Communities and Homeowner's Guide to Retrofitting websites. Any alteration to a building or land, including re-grading, filling or modifying a sewer line, requires a permit. For more information regarding building and site modifications, call Land Development Services at 703-324-1720, TTY 711.

Residents can help prevent flooding by keeping storm drains clear of trash and debris. Litter blocking storm drains may cause flooded streets, traffic delays and property damage. Please use the storm drain flooding report form to notify the county of blocked storm drains.

Submit Online Form

What is a floodplain?

In general, a floodplain is the flat area located adjacent to the main stream channel. When stream banks overflow during or after a storm, the floodplain provides natural storage for the excess water.

There are three distinct kinds or categories of floodplains in Fairfax County:

  1. Minor Floodplain: drainage area greater than 70 acres but less than 360 acres.
  2. Major Floodplain: drainage area 360 acres or greater.
  3. Those which are designated as a floodplain by the National Flood Insurance Program.

For further information about defining floodplains, please see the Zoning Ordinance, Article 20, Definitions.

Special Flood Hazard Areas

Special Flood Hazard Areas are high risk areas that have a one-percent chance of being inundated by a base flood in any given year as identified by the National Flood Insurance Program maps. Floodplain management regulations must be enforced and mandatory purchase of flood insurance applies for these areas. For more information, please visit FEMA's Special Flood Hazard Area website or see the Special Flood Hazard Area Maps.


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