Stockton Water Q & A

Is the ozone disinfection stage before or after the flocculation/settlement/filtration stage?

At the water treatment plant, ozone disinfection is used in the primary disinfection process as water from the Delta enters the plant.  Water is then passed through the flocculation/settlement process, followed by microfiltration.  Once completed, the treated water passes through the chloramination process for secondary disinfection and distribution into the City’s water system, as illustrated in this diagram of the water treatment plant

The reason for the different disinfection processes is to maintain a “chlorine residual” in the City’s water distribution system under State regulations.  Ozone disinfection, while very effective, cannot provide the required residual in the system.  This is important because the utility must ensure the water quality is maintained from source to tap.


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This City of Stockton web page last reviewed on --- 1/28/2016