Your Water
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 (as of 2012-13 Capital Improvement Program)
  • Cost: $54.3 million, funded by water rates         

Chain of Lakes Water Facilities and Improvements: 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: 2035 (as of 2012-13 Capital Improvement Program)
  • Cost: $77.9 million, 70% 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.