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Rinconada Water Treatment Plant Reliability Improvement

About This Project

The Reliability Improvement Project is aimed at retrofitting, upgrading and/or replacing key equipment that is reaching the end of its natural life, addressing the areas of raw water ozone, flocculation and sedimentation. Filtration and redundant disinfection.

The work will also increase the plant’s treatment capacity from 80 million gallons of water a day to 100 million gallons a day and help the district meet increasingly stringent standards for water quality, seismic stability and safety.

Future site rendering
Los Gatos
Phase 2
All 5 Phases targeted for completion by 2027
News and UpdatesNews and Updates
Reports and DocumentsReports and Documents
Environmental and Community BenefitsEnvironmental and Community Benefits
History and BackgroundHistory and Background
News & Updates

Sediment removal begins Aug. 24, 2020

Beginning Monday, Aug. 24, 2020, Valley Water will begin a two month-long operation to remove sediment from one of the drying ponds at the plant. Drying ponds collect runoff from the water treatment process, settling in the basins until they dry and harden so they can be removed later and taken to a local landfill. This activity is carried out periodically, every two years, as part of the plant’s normal operations and maintenance activities.   

The sediment removal is scheduled to be completed by Oct. 14, 2020. The detailed work activities are scheduled below:

  • Aug. 24 – Aug. 27: Excavator begins turning over sediment for further drying out.
  • Sept. 28 – Oct. 2: A bulldozer will stack the sediment into piles.
  • Oct. 5 – Oct. 14: Sediment removed and trucked to a local landfill.   

The work will result in a temporary increase of traffic along Granada Way. Eight to 10 trucks will use the Granada Way gate entrance daily, with each truck carrying about three loads. These vehicles will not be allowed to idle while waiting to enter the facility. A flagger and traffic signs will be in place to assist with safety.

Please anticipate increased noise levels near Granada Way. Work hours for the heavy equipment operators are 8 a.m. to 3 p.m., Monday through Friday. In adherence to restricted operating hours, trucks conducting sediment removal will work between the hours of 8:30 a.m. through 2:30 p.m. on weekdays. No weekend work is scheduled.

Current Reliability Improvement Project status

Valley Water is targeting late 2020 to complete the second phase of the Reliability Improvement Project. At the project's outset, the water district anticipated this second phase to last the longest. Its completion will mean the Reliability Improvement Project is about 65 percent completed

Phase 2 has involved the construction of several facilities, including:

  • Raw water ozone contactor
  • Flash mix facility
  • Flocculation and sedimentation basins
  • Wash water recovery facility and temporary water piping.

Phase 3 of the Reliability Improvement Project, which involves demolition of the four clarifiers, is scheduled to begin in 2022. Valley Water will use 2021 to conduct site restoration and cleanup of the facility.

Granada Gate access

The Granada Way gate remains closed to the Reliability Improvement Project's contractors to access the treatment plant. The workers are using the lower gate on More Avenue to enter and exit the facility.

Saturday work

Saturday work at the treatment plant will continue as the water district steps up efforts to complete the project in a timely and safe fashion. Since July 2018, the district has allowed contractors to work Saturdays between 9 a.m. to 3 p.m. Some restrictions are in place out of consideration for our neighbors, including:

  • No construction truck or tractor work outside of buildings, including dump trucks, backhoes, jackhammers or other motorized equipment.
  • No outside construction lighting or outside generator operations.
  • No use of the Granada gate.   

Public meeting videos available on You Tube

Valley Water keeps a video library of its past community meetings on its You Tube channel at        

For any questions, please contact the water treatment plant's neighborhood liaison, Tony Mercado, at 408-630-2342 or via email at [email protected] 

Contact information
If you have any questions or concerns about the Reliability Improvement Project, please contact Neighborhood Liaison Tony Mercado during regular business hours at (408) 630-2342, or by email at [email protected]. He can also be reached after hours at (408) 426-1039. 

If an urgent problem arises after regular business hours, please call the on-duty plant supervisor at (408) 265-2607, ext. 2121.

Valley Water s committed to providing a healthy, clean, reliable and affordable water supply that meets or exceeds all applicable water quality regulatory standards in a cost-effective manner

Environmental & Community Benefits

The Reliability Improvement Project will replace or upgrade all major plant components and increase Rinconada’s treatment capacity to 100 million gallons of water a day. These enhancements will also result in improved taste for your drinking water. The Project includes the design and construction of new facilities, including raw water ozonation, flocculation and plate settler clarification and dual media filtration. This work will also help the district meet increasingly stringent standards for water quality, seismic stability and safety.

This completed project will use the following steps in drinking water treatment:

  • Raw Water Ozone
  • Flocculation and Sedimentation
  • Filtration
  • Redundant disinfection
History & Background

The Rinconada Water Treatment Plant is Valley Water’s oldest treatment plant, having provided continuous and reliable service since 1967. While Rinconada primarily serves the west side of Santa Clara County, residents across the county contribute to the project funding through water rates.