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Section 301 of the Clean Water Act
Section 301 of the Clean Water Act (CWA) prohibits a point source discharge of pollutants into waters of the United States without an NPDES (National Pollutant Discharge Elimination System) permit. Due to the fact that many pressure washer operators are mobile, it is not realistic to pre-determine discharge locations and obtain permits for each location. The most common method of compliance with the CWA is to prevent process wastewater discharges to waters of the United States. Examples of compliance without a discharge are vacuuming up the process wastewater or berming the process water and allowing it to evaporate. An additional method of compliance is to discharge the water to an NPDES permitted sanitary sewer system (the municipality may have additional pretreatment requirements before accepting your discharge).