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In addition to recent water-quality upgrades, including a Dissolved Air Flotation Facility to increase treatment capacity at our Del Valle plant, we are making further improvements:
Mocho Groundwater Demineralizaton Plant: This project began operating in August 2009 to slow down the buildup of salts and minerals in the groundwater basin to 1) protect the basin's long-term use, 2) facilitate the use of recycled water for irrigation purposes, thereby enhancing the Valley's overall water-supply reliability, and 3) soften some of the groundwater supplies delivered primarily to the western side of Zone 7's service area (the City of Pleasanton and the Dublin San Ramon Services District). Groundwater is pumped to the new facility for removal of minerals, such as calcium and magnesium, which, while not harmful to health, can leave buildup on plumbing fixtures. For a fact sheet on water hardness, click here.
 A few dozen people attended an open house at the new plant on September 23, 2009, including water retailer representatives from the City of Pleasanton, the City of Livermore and Dublin San Ramon Services District, along with several neighbors of the plant. In this photo, Board members Sarah Palmer and Bill Stevens lead a toast using demineralized water, with General Manager Jill Duerig in center and Dublin Councilman Don Biddle to left.
In photo to right, Tom Seacord of Carollo Engindeers, which designed the demineralization plant, leads several residents on a tour of the facility.
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Completion: August 2009
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Cost: $35.6 million, funded by water rates, connection fees on new development and a $740,000 Proposition 50 state grant
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A second plant of comparable size and cost, funded entirely by new development, is planned for the future
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For a photo tour of plant construction -- start to finish -- click here! (4 Mb)
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For further information, contact project manager Jarnail Chahal at
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Our planned Mocho demineralization plant uses reverse-osmosis (RO) membrane technology to treat up to 7.7 million gallons of groundwater a day pumped from a series of nearby existing Zone 7 wells. After the salt concentrate is removed, about 6.1 millions gallons per day of treated water is available for blending with other supplies prior to delivery to retailers. Zone 7 has partnered with the Dublin San Ramon Services District (DSRSD), a water retailer and the wastewater services provider in the western portion of the Valley, to discharge up to 1.6 million gallons per day of salt concentrate to the San Francisco Bay via the DSRSD system and, ultimately, the Livermore Amador Valley Water Management Agency (LAVWMA) export pipeline. For environmental documentation, click here.
Altamont Water Treatment Plant & Pipeline 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 such as ozonation treatment.
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Capacity: 24 million gallons per day initially, expandable to 42 mgd
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First-phase completion: 2016 at the earliest (as of 2010-11 Capital Improvement Program)
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Cost: Treatment plant estimated in 2010 Capital Improvement Program at $139.8 million (Phase 1) and $64.4 million (Phase 2), and pipeline's County Reach esitmated at $30.9 million (Livermore Reach was completed in 2009), all funded by connection fees on new development
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For additional information on this project, click here
Taste and Odor Treatment improvements: Will be added to our existing treatment plants
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.
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Projected completion: Now through 2030.
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Cost: $43.5 million, funded by connection fees on new development.
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