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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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

Large body of water with metal rods along the surface with green hills in the background.

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 is currently being upgraded to add ozone treatment.  The plant capacity will also be expanded from 12 million gallons per day (mgd) to 24 mgd.