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Storm and Sewer Information

The city's underground collection system is comprised of 260 miles of sanitary sewer lines and 75 miles of storm drains. 

Storm drains, or "outdoor drainage," typically flows to the nearest creek or watercourse.  Indoor waste drains are connected to a sanitary sewer line network that flows into a wastewater treatment plant where the waste is treated before is discharged into the San Francisco Bay. 

Help us protect our sanitary
sewer and storm drainage systems and the environment!
Report an illegal dumping, pollution or nuisance, condition, or other maintenance concern to Public Works at (650) 522-7300 or use our online complaint form.

More Information

Call the Environmental Compliance Office at (650) 522-7342.

San Mateo City Hall – 330 West 20th Avenue, San Mateo, CA 94403

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