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Water Supply Master Plan


Water Supply Master Plan

A reliable supply of clean water is necessary for the social, economic, and environmental well-being of Santa Clara County. The Water Supply Master Plan (WSMP) is Valley Water’s guiding document for long-term water supply investments to ensure water supply reliability for the County. Updated about every five years, this long-range plan assesses future county-wide demands and evaluates and recommends water supply and infrastructure projects to meet those demands to achieve Valley Water’s level of service (LOS) goal through the planning horizon. Valley Water’s LOS goal is to “Meet 100 percent of annual water demand during non-drought years and at least 80 percent demand in drought years.”

The most recent plan, Water Supply Master Plan 2040, was adopted by the Valley Water Board of Directors (Board) in 2019. Valley Water has started a two-year process to develop the Water Supply Master Plan 2050, which extends the planning horizon to 2050.  

On June 25, 2024, Valley Water staff will present an update on the Water Supply Master Plan 2050 to the Board of Directors and the public. Topics will include project evaluation, cost analysis, representative portfolios under three themes, and a proposed adaptive management approach to support making incremental investment decisions.  In addition, it includes recommended water conservation and potable reuse goals for Board approval. The meeting agenda, board packet, and staff reports can be found here.

Past WSMP 2050 updates to the Board occurred on September 19, 2023, and January 9, 2024. The archived meeting packets and recordings can be found here (Sept. 19) and here (Jan. 9).

Existing Water Supply Master Plan

Annual Monitoring and Assessment Program Update

For any questions or inquiries about the WSMP 2050, please contact [email protected]