Though seemingly a smaller operation, washing a car by hand often uses up to 100 gallons of water. This water also goes directly into storm drains, which usually go directly into the ocean—untreated.
Commercial car washes, however, use between eight and 45 gallons of water. This water is also often recycled, further reducing water usage. And unlike washing your car by yourself, the water used at a car wash is then treated before it is released into the sewage system,