How does the Clean Water Act regulate pollution discharged into U.S. waters?

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The Clean Water Act (CWA) regulates water pollution in the United States by establishing minimum standards for waste discharges across various industries and addressing specific hazards like oil spills.1

The act primarily targets point-source pollution—discharges originating from specific sources like factories or sewers—through the National Pollutant Discharge Elimination System (NPDES). Under this program, the Environmental Protection Agency (EPA) requires facilities to obtain permits that strictly limit the quantity and type of materials they may discharge into U.S. waters. Furthermore, the National Pretreatment Program mandates that industrial sources reduce pollutants before they enter sewer systems, facilitating safer wastewater treatment and the potential recycling of sludge.1

While the CWA has significantly improved public health and water quality, it continues to face regulatory challenges regarding nonpoint-source pollution, such as runoff, and ongoing legal debates concerning the scope of federal authority over wetlands and other "waters of the United States."1