What does “MS4” stand for in relation to stormwater management?

“MS4” stands for Municipal Separate Storm Sewer System. This term specifically refers to a system of conveyances that is designed to collect and convey stormwater runoff in urban and suburban areas, which is separate from the sanitary sewer system. It is specifically created to prevent stormwater from mixing with sewage, thereby reducing pollution in water bodies.

The designation of MS4 is essential in stormwater management because it is part of the regulatory framework under the Clean Water Act in the United States. MS4 permits and management practices are necessary to control the quality of stormwater discharges and to protect water resources from contamination caused by urban runoff. Knowing this terminology is crucial for anyone involved in stormwater management or environmental protection efforts, such as those at Walmart, as it helps in understanding the legal frameworks and responsibilities that govern stormwater systems.