Car washing is a common routine for residents and a popular way for organizations such as scout troops, schools, and sports teams to raise funds. However, when cars are washed in driveways and parking lots, the dirty wash water finds its way to the storm drain system and ultimately to streams and lakes. The wash water often contains pollutants such as: oils and grease, phosphates (from the soap), and heavy metals, all of which have negative impacts on water quality. Currently, only a few pollution prevention programs incorporate proper car washing practices as part of an overall message to residents on ways to reduce nonpoint source pollution.
What should you do?
1. Never direct wash water to catch basins and the storm drain system.
2. Wash your car on grass or other permeable surfaces.
3. Wash your car at a commercial facility that teats its water.
4. Use non-phosphate soap. Phosphates are nutrients that can cause environmental problems if washed into streams or ponds.
5. Block off the storm drain during charity car wash events or use an insert with a vacuum pump to catch wash water and discharge into sanitary sewer system.
6. Use hoses with nozzles that automatically turn off when left unattended.
7. Use biodegradable soaps.
References and Resources
Center for Watershed Protection (CWP). 1999. On Watershed Behavior. Watershed
Protection Techniques. 3(2).
Kitsap County Sound Car Wash Program. 1999. Personal communication and webpage.
Website address:
www.kitsapgov.com/sswm/carwash.htm.
Lance Winslow III. 1999. How to Run a Successful Car Wash Fundraiser. Car Wash Guys
International, Inc.
Water Quality Consortium. 1996. King County, WA Pet Waste Management Campaign Ad.
