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Stormwater Matrix

Under the Clean Water Act, Congress authorizes the U.S. Environmental Protection Agency (EPA) to administer the National Pollution Discharge Elimination System (NPDES) permit program. The NPDES program addresses water pollution by regulating point sources that discharge pollutants into waters of the United States, including stormwater from construction activities. When stormwater flows over an active construction site, the water picks up pollutants and transports them to storm sewers or directly into waterbodies. Common pollutants include sediment, debris, and chemicals.

Most states are authorized by the EPA to implement their own construction stormwater NPDES permitting program. Although most states do not require facilities to continue post construction best management practices (BMPs) once the construction activity is complete and the Notice of Termination submitted, some states do require additional BMPs. In some locations, retail facilities may have to comply with post construction stormwater regulations from cities under a municipal separate small sewer system (MS4) permit. Retail facilities should check with state and local regulatory agencies to determine if the site is located in an area that requires coverage under MS4 permit.

Date Matrix Updated July 2017

Stormwater Matrix​


Last Update: 7/25/2017 11:13:51 AM