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Assistance Tools for Municipal Separate Storm Sewer Systems (MS4s)

Resources for small businesses and local governments regarding municipal separate storm sewer systems (MS4s).

Municipal separate storm sewer systems (MS4s) consist of a conveyance or system of conveyances, including roads with drainage systems, streets, catch basins, curbs, gutters, ditches, human-made channels, or storm drains. The following resources are provided to assist the regulated community in meeting permit requirements.


Annual Reporting Requirements for Phase II (Small) MS4s TPDES General Permit No. TXR040000

This contains the reporting requirements, instructions, examples, and a report template for Phase II (Small) MS4s.

To obtain the following forms, go to the TCEQ Forms Web page and search for the form number indicated (in parentheses).

  • Notice of Intent (TCEQ Form 20368)
  • Notice of Change (TCEQ Form 20392)
  • Waiver 1 (TCEQ Form 20369)



U.S. Environmental Protection Agency

The following links take you off the TCEQ website (Exit the TCEQ). If you encounter an inactive (broken) link, please send an e-mail to and indicate which link was broken.

Texas Watershed Steward

Center for Watershed Protection

Texas Coastal Watershed Program

Phase I MS4s in Texas

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