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Sewer System Improvement Program

The Sewer System Improvement Program (SSIP) is a 20-year, multi-billion dollar citywide investment required to upgrade our aging sewer infrastructure to ensure a reliable, sustainable, and seismically safe system. It is critical that we embark on these investments today to ensure we have a well functioning system that will continue to protect public health, the environment, and our local economy now and for generations to come.

    System Challenges

Aging Infrastructure
Seismic Vulnerability   Climate Change Impacts
Aging Infrastructure
Over 80% of our pipes are over 100 years old and the system gets overwhelmed during heavy rains.
Seismic Vulnerability
Our sewer system was not built to withstand a major earthquake and facilities are seismically vulnerable. 
Climate Change
The increasing intensity and frequency of storms can overwhelm our system and contribute to flooding. 

Excavator work near open trench with large pipe at Cesar Chaves
Grey Green Clean photos
Cityscape View of North Shore Watersheds shows skyrise buildings downtown and Coit Tower
Odor Control
Odors can be a problem when aging equipment malfunctions and during dry weather.
Water Quality

Continue to reduce combined sewer discharges to help improve water quality in the Bay and Ocean.

  Localized Flooding
Stormwater runoff can overwhelm our system during heavy rains and lead to neighborhood flooding.


Wastewater Treatment Plants
A vast network of pipes transports and delivers San Francisco’s wastewater to one of our two local treatment plants: the Southeast Treatment Plant or the Oceanside Treatment Plant. During a storm, the North Point Wet-Weather Facility is activated to treat additional flow.  
Southeast Plant
  Southeast Plant
  Southeast Plant
Oceanside Treatment Plant   Southeast Treatment Plant   North Point Wet-Weather Facility 

Collection System

Our collection system consists of over 1,000 miles of sewer pipes, 17 pump stations, transport storage boxes, and over 25,000 catch basins. This critical system collects, stores and transports over 40 billion gallons of wastewater a year to our treatment plants. 

Image of Bioswales at Lake Merced   Image of Bioswales at Lake Merced   Image of Bioswales at Lake Merced
Central Bayside System Improvement Project   Westside Pump Station Project   Embarcadero Drumm & Jackson Sewers Project

Green Infrastructure Projects
These innovative SSIP green infrastructure projects focus on sustainable methods to manage stormwater in the City’s eight urban watersheds to keep it from entering our combined sewer system while enhancing neighborhood beautification. 

GI Valencia Green
Mission & Valencia Green Gateway
GI Permeable Wiggle
Wiggle Neighborhood Green Corridor
Photo showing Spoffard Alley
Learning Lab Rendering
Sunset Boulevard Greenway
Image of Holloway Street Perspective 1
Holloway Green Street
Cropped Graphic of Yosemite Creek Daylighting Concept
Yosemite Creek Daylighting
Sunnydale Mini-Plaza Rendering
Visitacion Valley Green Nodes
Photo of Baker Beach
Baker Beach Green Street

Ways to Protect YOUR Sewer
We work 24 hours a day, seven days a week treating everything that goes down your drain. Do your part to protect our sewer system and learn more at the resources below. 

Image of Oceanside Plant Upgrades
Image of Front Lawns in Sunset
Image of Wiggle Rendering
Take a Tour Adopt A Drain Stormwater Grants

Last updated: 12/21/2017 10:52:21 AM