Which option correctly expands the acronym NPDES?

• A. National Pollutant Discharge Elimination System
• B. National Pollutant Discharge Elimination Standard
• C. National Pollutant Discharge Emission System
• D. National Pollution Discharge Enforcement System

Answer: (A)

NPDES is the regulatory program that controls how pollutants are discharged into U.S. waters, under the Clean Water Act. The correct expansion is National Pollutant Discharge Elimination System. Here, Pollutant refers to any contaminant, Discharge means releasing that contaminant into a water body, Elimination System conveys the goal of preventing or reducing discharges within a regulatory framework, and System indicates an organized program managed by EPA with state partners. In practice, facilities obtain NPDES permits that set effluent limits, require monitoring and reporting, and help ensure water quality is protected. The other phrasings use different words (Pollution vs Pollutant, Emission vs Discharge, Enforcement vs Elimination) that change the meaning of the program.