Purified Water Project

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About the Project

Valley Water is expanding its ability to replenish its groundwater with purified water, a drought-resilient, and locally controlled water source. Valley Water must meet future water demand and identify a sustainable water supply to combat the effects of climate change. The Purified Water Project will help meet those water supply goals, which include providing at least 10% of water demand in Santa Clara County through recycled and purified water.

The project will allow Valley Water to develop the use of purified water to supplement existing water sources in a manner that minimizes environmental impacts.

The Purified Water Project will evaluate building an advanced water purification facility at one of two potential sites:

  1. Expansion at the existing Silicon Valley Advanced Water Purification Center located on Zanker Road in San Jose;
  2. At the former Los Altos Treatment Plant site, which is owned by the City of Palo Alto and located on San Antonio Road in Palo Alto.

When completed, this project will build a facility capable of providing at least 10 million gallons per day of high-quality, drought-resilient water. From one of these sites, a conveyance pipeline and an onsite pump station would be constructed to transport purified water to groundwater recharge ponds along Los Gatos Creek located in the city of Campbell.

This water would supplement existing water from other sources to replenish groundwater, especially during drier years. Depending upon the selected route, the conveyance pipeline would be approximately 18 to 20 miles long.

About Groundwater Replenishment

Following purification at the treatment facility, purified water is transported through a pipeline system to groundwater recharge ponds. At these ponds, purified water naturally filters through underground soil, gravel, and rock before replenishing groundwater basins. Here, the water will blend with water already in the basin over several months and years before reaching wells for drinking or home use.

What is Purified Water?

Water has always been nature’s renewable resource and is constantly moving through the water cycle. Purifying water simply speeds up that natural process by using a multistep effort to remove potential water contaminants, creating a drought-resilient and sustainable water source.

How Safe is Purified Water?

Purified water is safe and meets or exceeds state and federal drinking water standards. It is tested regularly by our certified Water Quality Lab to ensure safety and quality. Upon completion of the Purified Water Project, Valley Water will be able to use purified water to add to our groundwater replenishment efforts. Valley Water will join many other places in the United States and worldwide in using this water purification and replenishment method, including Monterey and Orange counties in California, Texas, Australia, and Singapore. To learn more about how purified water is used as a drinking water source and the purification treatment process, please visit purewater4u.org. There, you can also sign up for tours of the existing Silicon Valley Advanced Water Purification Center.


About the Project

Valley Water is expanding its ability to replenish its groundwater with purified water, a drought-resilient, and locally controlled water source. Valley Water must meet future water demand and identify a sustainable water supply to combat the effects of climate change. The Purified Water Project will help meet those water supply goals, which include providing at least 10% of water demand in Santa Clara County through recycled and purified water.

The project will allow Valley Water to develop the use of purified water to supplement existing water sources in a manner that minimizes environmental impacts.

The Purified Water Project will evaluate building an advanced water purification facility at one of two potential sites:

  1. Expansion at the existing Silicon Valley Advanced Water Purification Center located on Zanker Road in San Jose;
  2. At the former Los Altos Treatment Plant site, which is owned by the City of Palo Alto and located on San Antonio Road in Palo Alto.

When completed, this project will build a facility capable of providing at least 10 million gallons per day of high-quality, drought-resilient water. From one of these sites, a conveyance pipeline and an onsite pump station would be constructed to transport purified water to groundwater recharge ponds along Los Gatos Creek located in the city of Campbell.

This water would supplement existing water from other sources to replenish groundwater, especially during drier years. Depending upon the selected route, the conveyance pipeline would be approximately 18 to 20 miles long.

About Groundwater Replenishment

Following purification at the treatment facility, purified water is transported through a pipeline system to groundwater recharge ponds. At these ponds, purified water naturally filters through underground soil, gravel, and rock before replenishing groundwater basins. Here, the water will blend with water already in the basin over several months and years before reaching wells for drinking or home use.

What is Purified Water?

Water has always been nature’s renewable resource and is constantly moving through the water cycle. Purifying water simply speeds up that natural process by using a multistep effort to remove potential water contaminants, creating a drought-resilient and sustainable water source.

How Safe is Purified Water?

Purified water is safe and meets or exceeds state and federal drinking water standards. It is tested regularly by our certified Water Quality Lab to ensure safety and quality. Upon completion of the Purified Water Project, Valley Water will be able to use purified water to add to our groundwater replenishment efforts. Valley Water will join many other places in the United States and worldwide in using this water purification and replenishment method, including Monterey and Orange counties in California, Texas, Australia, and Singapore. To learn more about how purified water is used as a drinking water source and the purification treatment process, please visit purewater4u.org. There, you can also sign up for tours of the existing Silicon Valley Advanced Water Purification Center.


  • Sept. 23 Press Conference on Purified Water

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  • Geotechnical work at the Palo Alto site

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    Starting mid-May, Valley Water will conduct a geotechnical study at the former Los Altos Treatment Plant at 1237 San Antonio Road in Palo Alto for the Purified Water Project. This site is one of two locations under study for a future advanced water purification facility. As part of the project planning process, Valley Water contractors will conduct geotechnical investigations using a drill rig to evaluate the condition of the site’s soil.

    Work will occur between the hours of 7 a.m. and 4:30 p.m., Monday through Friday, and is expected to last approximately a week. Trail and traffic impacts are not anticipated. A biological survey will be done prior to the drilling to ensure the protection of sensitive species and habitat.

  • Missed the scoping meeting? Watch the recording!

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    If you missed a part or all of the virtual scoping meeting, you can watch the meeting recording above. The project's Notice of Preparation is also available for public review and comments on the scope of environmental analysis in the Environmental Impact Report (EIR). Brief details about the proposed project's purpose and objectives, an alternative to the proposed project, potential environmental impacts, and the resulting need for the EIR will be found in the project's Notice of Preparation (NOP). The NOP is posted and available for review at Valley Water's "Public Review Documents(External link)" site.

    Responsible and trustee agencies, and other interested agencies, organizations, and individuals, are invited to provide written comments on the scope and content of the Draft EIR. Comments must be sent at the earliest possible date, but no later than 5 p.m. on Tuesday, April 27, 2021. Please include a name and contact information alongside your formal comments to:

    Elise Latedjou-Durand
    Valley Water
    5750 Almaden Expressway
    San José, CA 95118
    (408) 630-3095
    EDurand@valleywater.org

  • Join our Public Virtual Scoping Meeting on Monday, Mar. 29

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    supporting image

    Valley Water is hosting a virtual scoping meeting for the Purified Water Project on Monday, March 29, 2021 from 5:30 p.m. to 7:30 p.m.

    At this meeting, the community will learn more about the project, the planning process and provide feedback related to environmental impacts that will be analyzed as part of the California Environmental Quality Act (CEQA) process.

    Meeting Details

    CEQA Public Review (Spring 2021)

    In addition to the scoping meeting, Valley Water is welcoming public comment on the scope of environmental analysis in the Environmental Impact Report (EIR). Brief details about the proposed project's purpose and objectives, an alternative to the proposed project, potential environmental impacts, and the resulting need for the EIR will be found in the project's Notice of Preparation (NOP). The NOP is posted and available for review at Valley Water's "Public Review Documents" site.

    Responsible and trustee agencies, and other interested agencies, organizations, and individuals, are invited to provide written comments on the scope and content of the Draft EIR. Comments must be sent at the earliest possible date, but no later than 5 p.m. on Tuesday, April 27, 2021. Please include a name and contact information alongside your formal comments to:

    Elise Latedjou-Durand
    Valley Water
    5750 Almaden Expressway
    San José, CA 95118
    (408) 630-3095
    EDurand@valleywater.org


    Camden groundwater replenishment pond near Los Gatos Creek


Page last updated: 18 October 2021, 14:25