Water Treatment Facilities

Overview

Water Treatment Facilities Deliver a World of Good

Zone 7 operates two water treatment plants (Del Valle Water Treatment Plant and Patterson Pass Water Treatment Plant), the Mocho Groundwater Demineralization Plant, 10 groundwater supply wells and a state-of-the-art water quality testing laboratory. Water treatment facilities are staffed by talented and committed experts in their fields who make a world of difference when it comes to bringing safe water to the Tri-Valley community.

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Patterson Pass Water Treatment Plant Equipment

Patterson Pass Water Treatment Plant Tours!

Join us for a free tour of the recently upgraded water treatment facility.

Patterson Pass Water Treatment Plant Aerial view

The recently upgraded Patterson Pass Water Treatment Plant will be opening its doors to the public for in-person tours on June 17! 

In June of 2022, the water treatment facility completed major construction upgrades to ensure we are delivering the highest quality water to the businesses and residents of the Tri-Valley. 

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Del Valle Water Treatment Plant

Del Valle Water Treatment Plant amidst grassy hills.

The Del Valle Water Treatment Plant has been serving the Tri-Valley community since the 1970s and was recently upgraded to add raw water ozonation to the existing treatment process. The ozonation project is the latest investment by Zone 7 to support the continued delivery of high-quality water to Zone 7 customers.

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Water Quality Lab at Del Valle Water Treatment Plant

Three Zone 7 white lab coats hanging on a wall.

Our state-of-the-art water quality lab is housed at the Del Valle Water Treatment Plant and run by expert water quality chemists and technicians willing to carry the weight of the world on their shoulders – or at least the weight of Tri-Valley’s water.

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Patterson Pass Water Treatment Plant

The Patterson Pass Water Treatment Plant has been serving the Tri-Valley since 1962, treating imported surface water from the adjacent South Bay Aqueduct using dual-media filtration and chlorine treatment techniques. The plant has recently been upgraded to add ozone treatment.  The plant capacity has also been expanded from 12 million gallons per day (mgd) to 24 mgd.