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Flood Protection
Water & Environment

Water Quality Projects


Recent water-quality upgrades include a Dissolved Air Flotation Facility to increase treatment capacity at our Del Valle Water Treatment Plant, and the Mocho Groundwater Demineralization Plant to slow down the buildup of salts and minerals in our groundwater basin. In addition to planning a second groundwater demineralization facility, further water-quality enhancements are planned:

Taste and Odor Treatment improvements: Will be added to our existing treatment plants

  • Projected completion: 2023
  • Cost: $54 million, funded by water rates         

Chain of Lakes Water Storage and Groundwater Recharge: Consists of developing, designing and implementing improvements and facilities at various abandoned gravel-mining pits for the purposes of water storage and groundwater recharge. While primarily a water supply/reliability project, this will also improve water quality because increased recharge will help flush out salts from the groundwater basin.

  • Projected completion: Now through 2030.
  • Cost: $43.5 million, funded by connection fees on new development.

Water Treatment Plant Expansion: This plant expansion of up to 12-16 million gallons a day (mgd) will be constructed either at the Altamont site near Dyer Reservoir or the Patterson Pass Water Treatment Plant. The project will accommodate planned Valley growth, enhance overall water-system reliability and improve overall water quality by reducing Zone 7's reliance on groundwater and through plant design features.

  • Capacity: 12-16 million gallons per day
  • Completion: 2025 (as of 2012-13 Capital Improvement Program)
  • Cost: Treatment plant estimated in 2012-13 Capital Improvement Program at $176.3 million, funded by connection fees on new development.

Stretch of Pipeline in Livermore Now Built

In April 2008, Zone 7 awarded a contract to Ranger Pipelines Inc. to build a 5-mile segment of pipeline within the City of Livermore, from Kitty Hawk Road to the vicinity of Vasco Road. Construction of this initial segment, which was part of the larger Altamont Water Treatment Plant & Pipeline Project, was completed in October 2009.

Zone 7 is currently evaluating the timing of the larger project's future phases, including the potential treatment plant itself and the remaining 6-mile stretch of pipeline through unincorporated Alameda County west to Livermore.  But independent of this larger project, the pipeline segment between Kittywawk and Vasco roads has its own immediate benefits. By creating a loop within Zone 7's existing water-delivery system, it provides improved water-supply reliability for a portion of eastern Livermore in the event of emergency outages of water deliveries from the South Bay Aqueduct.