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Peninsula Pipelines Seismic Upgrade

Project Information
April 2014
February 29, 2016
Cost $42 Million
Project Phase Construction
Additional Information

The information shown reflects the current forecast information published in the latest WSIP Quarterly Report.


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PPSU Project Update

Project Update
The Peninsula Pipeline Seismic Upgrade (PPSU) Project has completed construction at all six sites in Millbrae, South San Francisco, San Bruno and Colma. PPSU construction activities started in April 2014.

In September 2015, the PPSU Project completed the final construction milestone by removing and replacing 1,100 feet of aging pipeline in San Bruno then putting it back into service in September 2015. The Project completed all WSIP work and reached final completion in February 2016.

PPSU San Andreas Pipeline 3
Final look at San Andreas Pipeline No. 3 at Shelter Creek Condominiums in September


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Project Description:
The PPSU project consists of seismic upgrades to three Hetch Hetchy regional water delivery pipelines located in San Mateo County. The pipelines in need of repair are known as San Andreas Pipelines No. 2 and 3, and Sunset Supply Branch Pipeline. These upgrades are critical to the Hetch Hetchy Regional Water System and will increase pipeline reliability during potential seismic events.

Project components include replacing segments of the pipeline, open trench construction, surface restoration and installing structural support within an existing tunnel. The PPSU project includes six improvement components at five different locations on the San Francisco Peninsula in San Mateo County. The pipeline work areas for this project are located in residential areas of Colma, South San Francisco, San Bruno and Millbrae.

Last updated: 7/27/2018 9:06:42 AM