Many Santa Clara County residents know how unpredictable our water supply can be. The last decade brought the Golden State five consecutive years of drought, followed by one of the wettest winters on record.
In the face of climate change, Valley Water remains focused on preparing for future wet and dry years to ensure Santa Clara County’s 2 million residents have a reliable supply of safe, clean drinking water.
We are currently developing one of our biggest projects in decades, the proposed expansion of Pacheco Reservoir in southern Santa Clara County. The Pacheco Reservoir Expansion Project is a strategic and forward-thinking, long-term investment toward ensuring a more reliable water supply for future generations.
The project is a collaboration between Valley Water, the Pacheco Pass Water District and the San Benito County Water District.
Pacheco Reservoir is located 60 miles southeast of San Jose and sits to the north of Highway 152. The proposed project will boost Pacheco Reservoir’s operational capacity from 5,500 acre-feet to up to 140,000 acre-feet, ensuring a more reliable supply of safe, clean drinking water.
In Santa Clara and San Benito counties, about 40% of our water supply is imported from the Sacramento-San Joaquin Delta, where water infrastructure is aging and vulnerable to earthquakes, levee failure and extreme weather conditions. In an emergency, we could lose that water for up to 18 months. The expanded Pacheco Reservoir could provide a year’s supply of water for up to 1.4 million people in an emergency.
In Santa Clara County, nearly half of all our water is pumped from underground basins. If we pump too much from our underground aquifers, the ground could sink, potentially causing long-term harmful impacts to roads, bridges and pipelines. Expanding Pacheco Reservoir would double the amount of water we can store above ground, making us less reliant on our groundwater supply during droughts.
The expanded Pacheco reservoir would enhance conditions for the threatened South-Central California Coast Steelhead population by providing suitable water flow and temperature to support the migration and survival of these fish.
In July 2018, Valley Water, the Pacheco Pass Water District and the San Benito County Water District collaborated to secure $484.5 million in funding from California’s Proposition 1 Water Quality, Supply and Infrastructure Improvement Act of 2014. The Act, passed by California voters, provides for $7.5 billion in general obligation bonds, including $2.7 billion for investments in surface and groundwater storage projects. The $484.5 million in funding was conditionally approved and accounts for more than one-third of the estimated $1.3 billion project cost.
Valley Water is also seeking federal funding and exploring other avenues to reduce the cost of the project to ratepayers.
Construction to expand Pacheco Reservoir is anticipated to begin in 2024. Preliminary estimates indicate construction would take at least five years.
To receive the latest information about the project or upcoming meetings, please sign up on the project’s webpage at valleywater.org/pachecoexpansion.