Farmers Branch Stormwater Management Plan

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What is an MS4?

A Municipal Separate Storm Sewer System (MS4) is a conveyance or system of conveyances that is:

  • owned by a state, city, town, village, or other public entity that discharges to waters of the U.S.,
  • designed or used to collect or convey stormwater (e.g., storm drains, pipes, ditches),
  • not a combined sewer, and
  • not part of a sewage treatment plant, or publicly owned treatment works (POTW).
  • https://www.epa.gov/npdes/stormwater-discharges-municipal-sources

Once a city or entity is in the MS4 program they remain in the MS4 program.  Operators of small MS4s that are fully or partially located within an urbanized area (UA)) as determined by the 2000 or 2010 Decennial Census by the U.S. Bureau of Census, must obtain authorization for the discharge of stormwater runoff and are eligible for coverage under the general permit. 

The City of Farmers Branch operates a Phase II, Level 2, small Municipal Separate Storm Sewer System or MS4.

As a designated small MS4 operator, the City of Farmers Branch must comply with the Texas Pollutant Discharge Elimination System (TPDES) General Permit TXR04000. The permit states:

Small Municipal Separate Storm Sewer Systems located in the state of Texas may discharge directly to surface water only according to requirements and conditions set forth in this General Permit…


MS4 Permit Issued by TCEQ

City of Farmers Branch Permit Coverage

First (1st) Issued 8/13/2007

NOI (Notice of Intent) & SWMP (Stormwater Management Plan)for 2008 to 2012 Permit Term

Submitted in accordance with permit requirements.

8/13/2012 to 11/12/2013

MS4s told to operate under current SWMP until new permit issued.  

Second (2nd) Issued 12/13/2013

NOI & SWMP for 2014 to 2018

Third (3rd) General Permit Issued

NOI & SWMP due to TCEQ by July 27, 2019