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Water Treatment Process

The Green Lake Sanitary Sewer & Water District (GLSSWD) water treatment plant has the ability to treat 1.2 million gallons of water per day. The treatment process consists of the following steps:

• Water is drawn from the quatunary buried artesian aquifer utilizing four wells ranging from 358 to 375 feet deep and pumped into the treatment plant.
• Aeration is utilized to remove unwanted gases, oxidize iron and manganese, reduce tastes & odors, and introduce oxygen into the water.
• Detention time, allowing for the settling and disposal of precipitated iron and manganese.
• Addition of potassium permanganate to the detention tank effluent.
• Dual media (sand & anthracite) water filtration utilizing four gravity filters (all filter backwash water is reclaimed and returned to the treatment process).
• Chlorine is added for disinfection control.
• Fluoride is added for dental hygiene purposes.
• Orthophosphate is added for corrosion control.
• Treated water is pumped to the Spicer, New London and Green Lake water towers, 250,000 gallon capacity each, for consumer use.