There is no central treatment plant for Kalamazoo. Water is treated at each of the 33 stations. Hard water and iron are two problems with the city's water supply. Chlorine, phosphate, and fluoride are added to the water. The phosphate is added to combat the iron in the water supply.
Chlorine is added to kill bacteria.
Fluoride is added for dental hygiene purposes. The service area is approximately 110 square miles. Several areas besides the city of Kalamazoo are served by the water district including a small part of Portage north of I-94, and parts of Pavilion, Kalamazoo, Richland, Comstock, Oshtemo, Cooper, and Texas Townships. Five of these tanks serve the City of Kalamazoo, although one of these five is located outside of the City limits. The two tanks that serve other parts of the water district have storage capacities of 1.5 million gallons each.