Sobrante Water Treatment Plant Ozone Improvement Project

EBMUD's Sobrante Water Treatment is undergoing upgrades to improve ozone water treatment abilities for greater system reliability and improved taste and smell of water when operational changes are made throughout the year to meet water demands of the community.

The Sobrante Water Treatment Plant is one of six water treatment plants in our East Bay service area. In service since the 1960's, the Sobrante plant is one of the major water treatment plants in our local system and operates continually throughout the year. The project is necessary to replace aging infrastructure, provide required maintenance, and increase the treatment plant's reliability. This work will occur within EBMUD property.


The Sobrante Water Treatment Plant Upgrade project will include the replacement of the existing air-fed ozone systems with a larger, more reliable, and more efficient liquid oxygen-fed systems. Work will include installation of new liquid oxygen tanks, new ozone generators and power supply units, ozone destruct units, new hydrogen peroxide storage and feed systems, new heating and ventilation systems for the ozone building, and new control system cables and conduits.

Construction began in summer 2017 and will be completed in fall 2018. Typical work hours are 7 a.m. to 6 p.m., Monday through Friday.

During April 2018, testing of the new system will begin and may result in possible noise impacts. During the testing of new equipment there will be several days of testing that will produce intermittent noises such as whistles and bangs.  These noises are normal for this process and should only occur during the hours of 8 a.m. to 5 p.m. There should be no other neighborhood impacts during testing.


Community Affairs

Phone: 510-287-7208
Emergencies or after-hours, call EBMUD at 866-403-2683