Municipal Separate Storm Sewer System (MS4)

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The City of Fairfax is a Phase II Municipal Separate Storm Sewer System (MS4) and is regulated by the Virginia Pollutant Discharge Elimination System (VPDES) general permit through the Virginia Department of Environmental Quality.  This permit allows the City of Fairfax to discharge stormwater per the State and Federal Laws created by the Clean Water Act.  The MS4 permit annual report is a required document prepared by the City each permit cycle to outline the activities the City is doing to reduce stormwater runoff and pollution to the maximum extent practicable

In 2023, DEQ approved a new general permit that became effective November 1, 2023 and expires October 31, 2028.

The MS4 Program must include an MS4 Program Plan that includes six minimum control measures and Special Conditions for approved Total Maximum Daily Loads (TMDL) for the Chesapeake Bay TMDL and non-Chesapeake Bay TMDLs. The six minimum control measures are:

  • Public Education and Outreach 
  • Public Participation/Involvement 
  • Illicit Discharge Detection and Elimination 
  • Construction Site Stormwater Runoff 
  • Post-Construction Stormwater Management in New Development and Redevelopment On Prior Developed Lands
  • Pollution Prevention/Good Housekeeping for Municipal Operations 

The City’s MS4 permit contains the Notice of Coverage Letter, information on minimum control measures, special conditions for Chesapeake Bay and non-Chesapeake Bay TMDLs, and their specific requirements.

Documents

MS4 Stormwater System Map & Outfall Information

This map shows the city’s stormwater system which is comprised of pipes, structures, inlets, outfalls, and publicly maintained stormwater management facilities (BMPs).  The outfall information table provides details for each point where a conveyance of the city’s stormwater system discharges into streams, ponds, and wetlands.

Click the links below to see a map of the stormwater outfall structure locations in the City.

Chesapeake Bay TMDL Action Plan

The public is invited to comment on the Phase III Chesapeake Bay TMDL Action Plan from September 16, 2024 through October 1, 2024. Please send comments via email to pw-stormwater@fairfaxva.gov.

Local TMDL Action Plans

Additional Information 

Please click here to view a document from NVRC with information and FAQ's on stream restoration projects.

To report Illicit Discharges click here

Please send additional comments and questions about the City’s MS4 permit or Stormwater Program, including the MS4 Program Plan, to Satoshi.Eto@fairfaxva.gov

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