The Texas MSGP – Renewed and Ready

Author: Anna Richardson

The Texas Multi-Sector General Permit (MSGP), TXR050000, regulating stormwater discharges from industrial facilities has been made available just ahead of its effective date of August 14, 2026. The renewed MSGP, permit fact sheet, and additional details are available on the Texas Commission on Environmental Quality’s (TCEQ) website. While there was no major overhaul from the previous permit, there are several items facilities with existing coverage should know.

Renewing coverage

• Facilities currently covered under the MSGP have 90 days (until November 12, 2026) to submit a Notice of Intent (NOI) to renew coverage under the updated MSGP or submit a No Exposure Certification (NEC) to continue that exemption, if applicable.
• Any necessary updates to existing Stormwater Pollution Prevention Plans (SWPPP) must be made prior to submitting a NOI. Details on potential SWPPP updates are detailed in the following section.
• All NOIs and NECs must be submitted via TCEQ’s online e-permitting system, STEERS.
• There is a renewal fee of $100.
• If MSGP coverage is no longer needed, a Notice of Termination (NOT) must be submitted by September 1, 2026 to avoid incurring the annual $200 water quality fee.

What has changed in the MSGP?

A full list of changes from the existing general permit are provided in TCEQ’s MSGP Fact Sheet. A selection of changes that may affect facilities’ current stormwater management program or require revisions to a SWPPP include:

• The North American Industrial Classification System (NAICS) codes were updated from the 2017 versions to the current list published in 2022.
• The renewal period (90 days) was included in the permit at Part II.C.3(a).
• Added a clarification that applications must be submitted to any municipal separate storm sewer systems (MSSSS) receiving discharges from an industrial facility, regardless of the MSSSS being regulated by TCEQ or not.
• An electronic SWPPP may now be prepared and maintained per Part III.A.1(c), provided it meets the requirements listed therein.
• If a facility is subject to the Water Quality Monitoring Requirements of Part III.B.4, substantially similar outfalls may not be established, per Part III.D.2(b)(3).
• Six benchmark values have been lowered based on data collected during the previous permit term.

1. For Sector C, lowered Phosphorus from 1.25 milligrams per Liter (mg/L) to 0.78 mg/L.
2. For Sectors K and S, lowered Ammonia Nitrogen from 1.7 mg/L to 1.0 mg/L.
3. For Sectors C, E, F, G, H, L, M, N, O, Q, and AA, lowered Iron from 1.3 mg/L to 1.0 mg/L.
4. For Sector K, lowered Cyanide from 0.02 mg/L to 0.01 mg/L.
5. For Sectors C, G, J, U, and AA, lowered Nitrate+Nitrite Nitrogen from 0.68mg/L to 0.60 mg/L.
6. For Sectors A, C, F, G, N, Q, Y, and AA, lowered Zinc from 0.16 mg/L to 0.12 mg/L.

What are my next steps?

1. Review your current SWPPP for necessary updates to comply with the updated MSGP.
2. Implement SWPPP and stormwater management changes.
3. Submit a NOI or NEC to continue coverage before November 12, 2026.

How can ALL4 help?

At ALL4, our Water Tech Team follows MSGP developments in Texas and nationwide and can help evaluate benchmark risks, update your facility’s SWPPP, prepare NOIs and NECs, and provide training and reporting support. If you have questions about the Texas MSGP renewal and the next steps for your facility, please contact Anna Richardson at arichardson@all4inc.com, (678) 293-9425 or Lizzie Smith at lsmith@all4inc.com, (770) 999-0269.