City of Fairfax, VA
Home MenuMunicipal Separate Storm Sewer System (MS4)
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 Annual Report - Year 1, 3rd cycle (2023-2024)
- MS4 Program Plan (2024 Update)
- MS4 Annual Report - Year 5, 2nd Cycle (2022-2023)
- MS4 Annual Report - Year 4, 2nd Cycle (2021-2022)
- MS4 Program Plan (2022 Update)
- MS4 Annual Report - Year 3, 2nd Cycle (2020-2021)
- MS4 Annual Report - Year 2, 2nd Cycle (2019-2020)
- MS4 Annual Report – Year 1, 2nd cycle (2018-2019)
- MS4 Program Plan (2019 Update)
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.
- Map of MS4 Stormwater System Map (static)
- Map of MS4 Stormwater System Map (interactive)
- MS4 Stormwater Outfalls Information Table
Chesapeake Bay TMDL Action Plan
- 1st Phase Chesapeake Bay TMDL Action Plan
- 2nd Phase Chesapeake Bay TMDL Action Plan
- 3rd Phase Chesapeake Bay TMDL Action Plan
- Chesapeake Bay TMDL Implementation Status Report, FY24
Local TMDL Action Plans
- Accotink Creek Chloride TMDL Action Plan, 2021 (Revised Feb 2022)
- Accotink Creek Sediment TMDL Action Plan, 2021
- Bull Run Sediment TMDL Action Plan, 2020
- Popes Head Creek Sediment TMDL Action Plan, 2020
- Accotink Creek Fecal Coliform TMDL Action Plan, 2020 (Revised Feb 2022)
- Difficult Run Sediment TMDL Action Plan, 2020
- Difficult Run E.Coli TMDL Action Plan, 2020 (Revised Feb 2022)
- Occoquan River E.Coli TMDL Action Plan, 2020 (Revised Feb 2022)
Additional Information
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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