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General Permit TXR040000 for Phase II (Small) MS4s

Requirements for obtaining authorization for stormwater discharges from small MS4s, the new General Permit, forms and annual reporting.

HOTUPDATERenewal of the Phase II Municipal Separate Storm Sewer System (MS4) General Permit, TXR040000

The TCEQ is in the process of renewing the TPDES Phase II Municipal Separate Storm Sewer System (MS4) General Permit, TXR040000, which expires on January 24, 2024. On September 27, 2022, TCEQ held a public stakeholder meeting to discuss the upcoming 2024 renewal where they presented preliminary proposed changes to the general permit and welcomed input from stakeholders. The recorded livestream and additional items from this stakeholder meeting are available on the Stormwater Stakeholders Group Webpage.

2019 General Permit for Small MS4s

The Small MS4 General Permit, TPDES Permit No. TXR040000, was issued on January 24, 2019. It authorizes the discharge of stormwater to surface water in the state from small municipal separate storm sewer systems (MS4s).

For specific information on the permit requirements, please refer to the following:


For additional information see the Assistance Tools for Stormwater Permitting.

To access historical information for the renewal process, please go to the Stormwater Stakeholders Group (SWSG) webpage.

Strengthening the protective elements of your permit

TCEQ continued utilizing the U.S. EPA application/pdfMS4 Permit Improvement GuideExit the TCEQ Adobe Acrobat PDF Document (adopted April 14, 2010) as during the 2013 permit renewal process. In addition, TCEQ incorporated the requirements of the federal MS4 Remand Rule from January 9, 2017, in the general permit and used the following guidance documents: Compendium of MS4 Permitting Approaches - Part 2: Post Construction Standards (EPA, 2016); Compendium of MS4 Permitting Approaches – Part 3: Water Quality-Based Requirements (EPA, 2016).

Annual Reports

All existing regulated MS4 entities are required to submit annual reports covering each year of the general permit's term.

The deadline or the reporting month for submitting annual reports for the general permit is based on the reporting period selected in the NOI submitted to TCEQ to obtain permit coverage.


2013 TPDES General Permit TXR040000

2007 TPDES General Permit TXR040000

Contact us if you have any questions about this general permit.