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Folsom Area Stormwater Improvement Project

  Project Materials 
Alternatives Analysis Report
Final Conceptual Engineering Report
• Soil Sampling Notice Areas A B C D E & Spanish

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Project Purpose and Need

The Folsom Area Stormwater Improvement Project is a part of the San Francisco Public Utilities Commission's (SFPUC) flood resilience efforts under the Sewer System Improvement Program (SSIP).

The low-lying Inner Mission neighborhood surrounding 17th, 18th and Folsom Streets has been historically subject to flooding during moderate to heavy storms. This capital project will construct new infrastructure to improve collection system capacity to manage stormwater for the level of service (LOS) storm, which has a 20% possibility of occurring in a given year. Additional project information is available in the final Needs Assessment and Alternatives Analysis Report located here, and the final Conceptual Engineering Report located here.


Project scope:

  • Construct a 3,500 linear foot, 12-foot internal diameter tunnel from the vicinity of Alameda/Treat Streets to the vicinity of 7th/Berry Streets.
  • Construct nearly 12,500 linear feet of sewer pipes to divert wastewater flow towards the new tunnel infrastructure. 
  Click on the image above for a larger view.


Project status: The project team is currently in design. From late June to September 2019 crews conducted field investigations and gathered soil samples for the project using truck-mounted drilling equipment at various locations in the project area. Project design for the upstream component is anticipated to complete summer 2021, and design for the downstream component is anticipated to complete winter 2021.


About the SSIP

The San Francisco Public Utilities Commission (SFPUC) recently launched the Sewer System Improvement Program (SSIP), a 20-year citywide investment to upgrade our aging sewer system and provide a more reliable, sustainable, and seismically safe system now and for future generations. The SSIP includes a series of facility upgrades at the Southeast Treatment Plant (SEP) located in the Bayview neighborhood of San Francisco. Click here to learn more about the SSIP.


Last updated: 7/20/2020 10:15:08 AM