What is one of the main purposes of the NPDES permitting system?

One of the main purposes of the National Pollutant Discharge Elimination System (NPDES) permitting system is to control pollution from point sources. This system was established under the Clean Water Act to authorize the discharge of pollutants into navigable waters while ensuring that discharges are controlled to meet water quality standards. Point sources are specific, identifiable sources such as pipes or outlets that discharge pollutants directly into water bodies. By requiring permits for these discharges, the NPDES system helps to limit the amount and types of pollutants that can enter waterways, thereby protecting aquatic ecosystems and public health. This regulatory framework plays a crucial role in maintaining the overall quality of surface waters throughout the United States, including North Carolina.