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Stormwater System Maintenance

The Surface Water Utility is responsible for maintaining all City-owned stormwater infrastructure, including over 4,500 catch basins, 75 miles of stormwater pipe, and 167 flow control and water quality features.  These structures are inspected and maintained on a regular basis.  Stormwater capital improvement projects are identified in the City’s Comprehensive Surface Water Management Plan and re-prioritized regularly.

In 2021, the City is starting a program to inspect its city-owned stormwater pipes that are 8″ diameter or greater.  This program will clean legacy pollutants from the pipes, help identify cross connections, and evaluate pipe conditions. It is estimated that it will take ten years for an initial evaluation of the city’s approximately 75 miles of stormwater conveyance pipes.

In addition, there are many privately-owned stormwater facilities in the City.  These ponds and underground vaults are the responsibility of private property owners, including Homeowner’s Associations, single family residences, and commercial properties.  If you have stormwater infrastructure on your property and are unsure of the maintenance responsibility, please contact the City’s Surface Water Technician at (425) 263-8082.

Take a look at our Stormwater Facility Maintenance Storymap HERE.

If you have an existing drainage problem, please submit a Service Request.


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