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Water Services

National Pollutant Discharge Elimination System

Each year, there are numerous individuals within different Metro Departments that work toward achieving overall Municipal Separate Storm Sewer System (MS4) permit compliance. As a measure to ensure permit compliance within the various facets of Metro government, the National Pollutant Discharge Elimination System Section (NPDES) was created to oversee all MS4 permit compliance activities. The NPDES Office, which is a section within the Metro Water Services (MWS) Stormwater Division, is responsible for performing specific MS4 permit requirements such as public education activities, illicit discharge investigations, runoff /discharge sampling, construction site inspections, field screening inspections, industrial inspections, etc. In addition, the NPDES Office is responsible for coordinating with various other Metro Departments to ensure permit compliance measures are being followed on a Metro - wide basis.