Public Works and Environmental Services

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
703-324-5033 TTY 711
12000 Government Center Parkway
Suite 448 Fairfax, VA 22035
Christopher S. Herrington

Flood Information

What can I do to protect my property?

Residents can help protect their property from the effects of flooding by understanding the risk in their area and possible actions. For detailed information visit FEMA's For Homeowners, Renters & Business Owners. 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.

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 FEMA's National Flood Insurance Program.

For further information about defining floodplains, please see the Zoning Ordinance, Article 9 Section 9104, Floodplain Definitions.

Special Flood Hazard Areas

Special Flood Hazard Areas (SFHA) are high risk areas that have a one-percent chance or more 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, visit FEMA Flood Map Service Center and FEMA National Flood Insurance Program.

Related Resources

Fairfax Virtual Assistant