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Seismic Upgrade of Bay Division Pipeline 
Nos. 3 & 4 at Hayward Fault
San Francisco Public Utilities Commission 

San Francisco, CA

San Francisco Public Utilities engaged MCK team to manage the work on the seismic upgrades of the two main water pipelines that supply potable water to over 2.5 million customers in the San Francisco Bay area. 


The 78-inch and 96-inch pipelines, known as Bay Division Pipeline (BDPL) Nos. 3 and 4, cross the Hayward fault in three locations in Fremont. Originally built in 1952 and 1973, BDPL Nos. 3 and 4 are critical water mains in the Hetch Hetchy Regional Water System that must function following a seismic event.

The new pipeline is highly reliable in the event of a major earthquake. The existing BDPL No. 4 was seismically retrofitted at the three fault traces. 


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