Storm Water Quality

Our Storm Water System

The City’s storm water system is complex and extensive. The Department of Facility Maintenance is responsible for the maintenance of this separate sewer system of over 1,100 miles of pipes, culverts, stream channels, and swales, and nearly 28,000 catch basins.

In addition to the above infrastructure that conveys storm water to our streams and ocean, the City also has some infrastructure that is designed to reduce the non-point source pollutants entering the system. These include Green Stormwater Infrastructure, hydrodynamic separators, storm drain inlet filters, and trash capture devices (litter booms and automatic retractable curb inlet screen covers).

To learn more about the City’s storm water activities, visit the About Us webpage or view the Storm Water Overview brochure.

To see the detailed map of the City’s Storm Water Systems, click here.

Examples of City Storm Water Infrastructure

A typical catch basin.
A typical catch basin.
A typical stream channel.
A typical stream channel.

A common drain inlet filter.

storm drain screen
Automatic Retractable Screen
The City's storm water system is separate from its drinking water and wastewater systems. Water entering the storm water system is not treated before it is deposited into stream channels and the ocean.
The City's storm water system is separate from its drinking water and wastewater systems. Water entering the storm water system is not treated before it is deposited into stream channels and the ocean.
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