The Small Municipal Separate Storm Sewer System (MS4) General Permit requires that operators of small MS4s develop a Storm Water Management Program that uses appropriate Best Management Practices (BMPs) for each of the six minimum control measures. The BMP approach will enable municipalities to develop sensible and cost-effective programs for controlling storm water runoff that are tailored to their needs. The operator is given a great deal of flexibility in determining BMPs and measurable goals for their MS4 service area.
Six Minimum Control Measures
The EPA expects that these six minimum control measures, when implemented together, will result in significant reduction of pollutants discharged into receiving waters:
- Public education and outreach. Inform citizens about the impact of polluted storm water on water quality through educational materials and other outreach programs
- Public participation/involvement. Provide opportunities for citizens to be involved in developing and implementing the storm water management program.
- Illicit discharge detection and elimination. Develop and put into action plans to detect and eliminate illicit discharges to storm sewer systems. Develop a system map and inform citizens of hazards associated with illegal discharges and improper wastewater disposal
- Construction site runoff control. Develop and enforce erosion and sediment control programs for construction sites.
- Post-construction runoff control. Develop and implement programs to address discharge of post-construction storm water runoff from new construction and redevelopment.
- Pollution prevention/good housekeeping. Develop programs to prevent or reduce runoff from municipal operations.