Small municipal stormwater sewer systems (MS4s) that are located within the boundaries of a Census Bureau defined “urbanized area” are regulated under EPA’s Phase II Stormwater Rule. This requires MS4s to develop a stormwater management program that will reduce the amount of pollutants carried by stormwater during storm events to waterbodies to the “maximum extent practicable”. The goal of the program is to improve water quality and recreational use of waterways.
Stormwater Pamphlets & Info