The Storm Water Management Program (SWMP) is a comprehensive program to manage the quality of discharges from the municipal separate storm sewer system (MS4). TxDOT does not utilize a single statewide SWMP but rather a district-specific SWMP that is based on a standardized plan.

The Texas Commission on Environmental Quality requires that the SWMP must contain a specified number of minimum control measures (MCM). In order to meet each required minimum control measure, TxDOT utilizes best management practices.

Title Date Description Format
TxDOT Stormwater Management Program 02/18 Describes TxDOT’s MS4 program and TxDOT’s obligations to meet permit requirements in TCEQ permit WQ0005011000
Volume I: Annual Report for TxDOT’s Statewide MS4 Permit 02/18 Volume I includes activities for the first year
Volume II: Annual Report for TxDOT’s Statewide MS4 Permit 02/18 Volume II includes activities under expired permits completed since the last annual report

Required Minimum Control Measures

A Large or Phase I MS4 Permit is issued to an operator, such as a city or county, who owns or operates storm sewers or storm sewer systems that serve populations of 100,000 or more.

A Small or Phase II MS4 Permit is issued to an operator, such as a county, university or transportation authority, who owns or operates storm sewers or storm sewer systems that serve populations within urbanized areas.

MCM No. Large MS4 MCM Small MS4 MCM
1 MS4 maintenance activities Public education, outreach and involvement
2 Post-construction storm water control measures Illicit discharge detection and elimination
3 Illicit discharges detection and elimination Construction site storm water runoff control
4 Pollution prevention and good housekeeping for municipal operations Post-construction storm water management in areas of new development and redevelopment
5 Industrial and high-risk runoff Pollution prevention and good housekeeping for municipal operations
6 Construction site storm water runoff Industrial storm water sources
7 Public education, outreach, involvement and participation Authorization for construction activities where the MS4 is the site operator
8 Monitoring and screening programs  

Best Management Practices

As referenced above, TxDOT uses best management practices (BMPs) to ensure that each minimum control measure is met and the storm water management program is successful.

Examples of BMPs include

  • Roadside swales
  • Structural controls
  • Schedules
  • Prohibitions
  • Maintenance procedures to prevent or reduce the discharge of pollutants
  • Operating procedures
  • Treatment requirements
  • Practices to control facility site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage areas

TxDOT utilizes various BMPs applicable to each MCM as displayed below. MCMs coordinate to the table above. The BMP Examples below indicate one of many BMPs TxDOT utilizes. The Implementation column describes how the BMP is implemented to meet each of the respective MCMs. Where additional information is available about a BMP or an implementation plan, it is linked in the table below.

MCM BMP Example Implementation
MS4 Maintenance Activities Structural  Control Maintenance Inspect structural controls at least once per year. Determine the need for maintenance, repair, or replacement and schedule follow-up actions as necessary.
Post-construction Storm Water Control Measures Permanent Structure Inspect permanent structural control.
Illicit Discharge Detection and Elimination Update Storm Sewer Outfall Map Map and screen all outfalls in MS4 areas.
Pollution Prevention and Good Housekeeping Waste Handling Ensure proper disposal of litter and debris removed from roadways by litter collection and/or street sweeping.

Ensure proper disposal of spoil materials removed during maintenance of drainage ditches and structural controls.
Industrial and High-risk Runoff No Industrial or High Risk Facilities are in the Right of Way Not applicable.
Construction Site and Storm Water Runoff Compliance with the CGP Develop and implement plan to ensure compliance, and require contractors to comply with the CGP.
Public Education, Outreach, Involvement and Participation Don't Mess with Texas Programs Continue Don't Mess with Texas programs, which may include Adopt-a-Highway, Campus Cleanup, Road Touch, and trash-off efforts.
Monitoring and Screening Programs Dry Weather Screening

Wet Weather Monitoring
Utilize Advanced Outfall Tracking System (AOTS).

Perform representative monitoring event or participate in Regional Surfacewater Monitoring Program.

Public Involvement

TxDOT invites the public to ask questions about the Storm Water Management Program. Contact us with questions or to request additional information. Information is also available on how you and your family can help prevent storm water pollution.

More Information