Water Treatment Process

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To ensure that your drinking water is always safe, we treat millions of gallons of raw water daily at three water treatment facilities serving Mesa. 

The City and its water treatment plants must meet rigorous standards established by the Environmental Protection Agency and the Arizona Department of Environmental Quality (ADEQ). The Brown Road Water Treatment Plant is capable of processing 72 million gallons per day and the Signal Butte Water Treatment Plant is capable of processing 24 million gallons per day. Both facilities are operated by ADEQ-certified operators. The raw water that feeds into the plants comes from the Central Arizona Project. The City also treats a portion of its drinking water from the Salt River Project at the Val Vista Water Treatment Plant, which is owned jointly with the City of Phoenix.

Raw water is processed as shown in the diagram below. The Signal Butte Water Treatment Plant also uses state-of-the-art ozone disinfection. To learn more, read Mesa's annual Water Quality Consumer Confidence Report