Storm Drain Management

Cleaning catch basins regularly is one of the most important stormwater source control measures a business can take. 

Storm drain

Here are some best practices to keep our waters healthy:

  • Perform regular inspections of basins and grates.
  • Keep waste and debris out of storm drains.
  • Clean up hazardous material spills properly.
  • Clean up oil or other vehicle fluid drippings.
  • Have your oil/water separator cleaned regularly.
  • Keep hazardous materials in closed, sturdy containers.
  • Minimize or avoid the use of pesticides, fertilizers, or excess water.
  • Prevent car wash water from reaching catch basins or storm water swales and other conveyances.

Spills happen!

When a spill reaches a drain, call 425-649-7000 for immediate assistance. If the spill puts people at risk, call 911. Stop the spill, contain the problem and properly clean up the area.

Important spill kit reminders:

  • Have a spill preparedness plan in place with emergency contacts
  • Train employees to react
  • Make sure your kit is fully stocked and accessible

storm drain basics


The storage area of the drain system will accumulate debris that settle on the bottom of the basin. Periodic removal of the debris is necessary to prevent the system from overflowing, which can flood streets and properties. At a minimum, have the storm system inspected and cleaned annually. Allowing sediment levels to exceed 60% of basin capacity increases the risk of flooding. If the system overflows, debris and pollutants traveling through it can enter streams and lakes.


Puget Sound Starts Here

Snohomish County Pollution Source Control

Preventing Pollution

Report Pollution in Unincorporated Snohomish County

Remember: Only Rain Down the Drain!