Water Treatment Process

The City of Mandan obtains water from the Missouri River. River water is made safe for drinking at the Mandan Water Treatment Plant. At the plant, river water is pumped to a pretreatment basin where objectionable tastes and odors are treated and suspended sediments are removed.

After pretreatment, the water passes through one of two treatment trains in the original 1958 (updated in 2009) or the 1985 plant addition. Each treatment train consists of softening, clarification, and stabilization, followed by disinfection and filtration. Each plant is capable of treating 6 million gallons/day for a total of 12 million gallons/day.