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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.

HOTThe TCEQ has renewed the General Permit for Small MS4s.

On January 16, 2019 the Commission adopted the 2019 TPDES general permit for small MS4s, TXR040000. The general permit’s effective date is January 24, 2019.

  • Starting from the effective date of the general permit, permittees have 180 days to submit a Notice of Intent (NOI) with an updated Stormwater Management Program (SWMP), or if applicable a Waiver application. Apply using the updated 2019 application forms.
  • Annual reports from all permittees will be submitted at regular schedules unaffected by the general permit issuance, unless the permittee requests a change of its annual reporting schedule.
    • Annual reports from small MS4s, who chose their fiscal year as their reporting year, will include in their FY19 annual report some months under the expired 2013 general permit and some months under the newly issued 2019 general permit:
    • Example: Oct. 1, 2018 – Sep. 30, 2019. Should be reported as one annual report.

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 MS4 Permit Improvement Guide 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

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

2007 TPDES General Permit TXR040000

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