Bay Area/ San Jose

Valley Water Halts Pacheco Reservoir Expansion in Santa Clara County Due to Soaring Costs and Regulatory Challenges

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Published on August 27, 2025
Valley Water Halts Pacheco Reservoir Expansion in Santa Clara County Due to Soaring Costs and Regulatory ChallengesSource: formulanone, CC BY-SA 2.0, via Wikimedia Commons

The Pacheco Reservoir Expansion Project, which has been in the planning stages for several years, hit a definitive end when the Valley Water Board of Directors voted to suspend its development yesterday. Rising costs and several regulatory hurdles have been cited as the main reasons for its termination. Initially strung with the promise of improved water storage capabilities for Santa Clara County, the project was meant to play a significant role in the region’s water supply master plan. Still, concerns over its financial viability have caused the agency to pull the plug.

In the wake of increasing expenses and the elongation of environmental review processes, officials have decided to temporarily stop and completely withdraw from the state funding program supporting the project. A statement from Valley Water Board Chair Tony Estremera, obtained by Valley Water, explained, "After careful consideration and assessment, my fellow board members and I have determined that proceeding with the Pacheco project is not in Valley Water’s best interest at this time." He stressed that the decision was tough but necessary, centering on the "community’s long-term water affordability."

Originally set to cost $3.222 billion—a significant jump from earlier estimates—the project saw its expenses balloon over time. This cost hike sharply highlighted the tension between infrastructure ambitions and fiscal responsibility. Reflecting this concern, Estremera emphasized that continuing with the Pacheco reservoir would lay too great a financial burden on ratepayers, overshadowing the prospects of achieving cost-effective gains in the water system. 

Despite receiving $504 million in conditional funding from the California Water Commission through the Water Storage Investment Program (WSIP), the agency has chosen to gracefully step away, potentially allowing these funds to be redirected to other statewide projects. Valley Water has maintained that they are not abandoning their mission; rather, they're redirecting focus towards other viable water supply and infrastructure projects highlighted in their master plan. They wish to ensure they can meet the county's future water needs without breaking the bank of its residents.

In a nod to the immense work that went into the now-defunct expansion project, Estremera, in a statement released by Valley Water, expressed gratitude towards the staff and consultants who kept the board well-informed, saying, "Their effort was key to keeping our board informed during the project's evaluation."