Vehicle wash water contains pollutants like oil, grease, heavy metals, solvents and soaps. When these harmful pollutants run off our driveways and roads, they go down the storm drain and travel to our local streams, lakes, rivers, and Puget Sound.
"It shall be prohibited and in violation of this chapter for any person or entity to:
A. Throw, drain, or otherwise discharge, cause or allow others under its control to throw, drain or otherwise discharge into the municipal storm drain system and/or surface and ground waters any materials other than storm water. Examples of prohibited contaminants include but are not limited to the following:
3. Petroleum products including but not limited to oil, gasoline, grease, fuel oil and heating oil.
4. Antifreeze and other automotive products.
5. Metals in either particulate or dissolved form.
15. Soaps, detergents, or ammonia."
So what does that mean?
It means that if you are washing your car at home, you cannot let the vehicle wash water run into the street or storm drains because it contains harmful pollutants.
Where am I supposed to wash my car?
Whenever possible, use a commercial car wash. If that's not an option, wash your vehicle over a permeable surface like grass or gravel that will allow the wash water to soak in and filter out pollutants. If you wash over grass or gravel, please use a chlorine and phosphate-free, biodegradable soap to help protect your soil.
Can't I just use biodegradable soap?
No. “Biodegradable” soap still pollutes water. These products are meant
to biodegrade in soil where microorganisms are present to break them
down. Even if there was a soap that actually did biodegrade in water, there
would still be all the dirt, oil, grease, and metals from the car washing that would end up in the nearest waterway.