![]() This fact sheet provides guidance on techniques to reduce water pollution from the washing of MS4 vehicle fleets applicable to MS4 Stormwater Pollution Prevention Plans (SWPPPs). MS4s often own and maintain their own fleet of vehicles that may include cars, tractors, trucks, parks equipment, and other types of vehicles. illicit discharge) therefore, wash water from a facility must be directed to a sanitary sewer or treated on-site prior to discharge. The EPA considers wash water to be a non-stormwater discharge (i.e. These environmental effects cause potentially fatal physiological disorders and reduced immune status in aquatic fish and other organisms. The impacts of these constituents discharging to downstream water bodies include increased biochemical oxygen demand (BOD), increased temperature and acidity, and reduced oxygen levels. Washing of vehicles and equipment generates oil, grease, sediment and metals in the wash water as well as degreasing solvents, cleaning solutions and detergents used in the cleaning operations. ![]() ![]() Municipal Separate Storm Sewer System (MS4) vehicle washing involves the removal of dust and dirt from the exterior of trucks, boats and other vehicles, as well as the cleaning of cargo areas and engines and other mechanical parts. ![]()
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