WATER-WISE CAR WASHING
Taking your car to the local car wash instead of washing it at home might seem like a guilty pleasure, but from an environmental perspective it is often the better choice. When you wash your car in the driveway or street, contaminants such as grease and brake dust (as well as the detergent itself) flow into storm sewers, which discharge directly into our waterways. Car washes, on the other hand, are required to drain their water into sanitary sewers (which direct sewage to treatment facilities) or to filter and reuse it on-site.
Water efficiency is also a benefit of many commercial car washes. An analysis by the Maryland Department of the Environment found that car washes use approximately 50 to 75 gallons of water per car (assuming the water is not being recycled); using the self-service bay consumes only 15 gallons. A typical garden hose, on the other hand, which has an average flow rate of seven gallons per minute, would exceed a car wash’s water consumption after two minutes compared with the self-service bay or seven minutes compared with the automated wash if the hose were left running.
If you don’t live near a car wash, here are some ways to clean your car in an ecological way:
Dump your dirty soap bucket into a sink or toilet. These drain into the sanitary sewer (instead of the storm sewer).
Written by: Union of Concerned Scientists. The Union of Concerned Scientists is a nonprofit partnership of scientists and citizens combining rigorous scientific analysis, innovative policy development, and effective citizen advocacy to achieve practical environmental solutions.
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