From Nov. 1, 2025 to April 29, 2026, Valley Water will shut down the west pipeline for scheduled repairs. This shutdown will affect all customers served by the west pipeline, including Sunnyvale, Mountain View, Santa Clara, San Jose Water Company and Cal Water.

To maintain water pressure and ensure fire protection, Sunnyvale crews will pump an additional 5.5 million gallons per day from the San Francisco Public Utilities Commission system into the southern part of the city.

Because this six-month outage is longer than usual, the City has prepared several safeguards:

• Alternative supply: Six City groundwater wells (7 MGD capacity) are available if needed.
• Preventative measures: Maintenance and inspections will be completed before the shutdown.
• Emergency readiness: Standby generators will be fueled and staged at wells and pump stations.
• Regional coordination: Staff are working with Cal Water, which serves about 1,000 Sunnyvale customers, to evaluate additional local supply options.

Repairs are scheduled during the low-demand season (November to April), when water use typically accounts for only 39% of annual demand. While City crews are experienced in managing these operations, Sunnyvale is preparing for every scenario to ensure reliable service.

Emergency Preparedness – Learn how to prepare for emergencies like a water shortage

For additional questions, email Joe De La Cruz, Water Operations Manager.