Municipal Separate Storm Sewer System (MS4)
Polluted stormwater runoff is commonly transported through Municipal Separate Storm Sewer Systems (MS4s), from there it  is regularly  often released  untreated into local bodies of water.

Make sure you’re doing your part by reporting any illicit discharges and illegal dumping in the storm drains that you see.

Potential Sources of Illicit Discharges

Used motor vehicle fluids such as oil, gas, and antifreeze

  • Household Hazardous Waste (such as household cleaners, paints, and pesticides)
  • Discharge from unpermitted industrial operations
  • Animal waste
  • Grass clippings and leaf litter

There are three easy ways to report it.

For more information on preventing stormwater runoff pollution, visit the Northern Virginia Clean Water Partners website.

For more information on MS4 and What Virginia is going to help keep the Environment clean visit Virginia’s Department of Environmental Quality

Land-Disturbing Sites
To report construction site concerns regarding erosion and sediment control problems or stormwater run-off, please call the Department of Public Works at 703-221-3400 or email:

*If it’s outside of the Town of Dumfries normal business hours or a holiday please use either of the below reporting options.

lllicit Discharge Detection and Elimination (IDDE) Recognizing and reporting potential IDDE


General Permit

VAR040117 MS4 General Permit Registration Letter

VAR040117 MS4 General Permit

Action Plans

Local TMDL Action Plan  MS4 Permit Cycle 2013-2018

Chesapeake Bay TMDL Action Plan MS4 Permit Cycle 2013-2018

Chesapeake Bay TMDL Action Plan MS4 Permit Cycle 2018-2023
MS4 Program Annual Report

MS4 Annual Report 2019

MS4 Annual Report 2018

MS4 Annual Report – FY2017