From there it is pumped to the Village system through pipes ranging in diameter from 20 inches to 42 inches. A These elevated storage tanks provide the pressure for the water system and emergency water supplies for fires and service interruptions if and when they occur. A Raw water is processed and treated at the Evanston filtration plant. The Village also performs weekly bacteriological analysis at 20 sites throughout the water system. A Chlorine, fluoride and polyorthophosphate are added to the water.
Chlorine is added to disinfect water from any microbial containments.
Fluoride is added to help prevent tooth decay, and Polyorthophosphate is added to coat pipes internally. This prevents lead and copper contamination of the water from older plumbing. A This program s benefits are twofold. It also serves as an annual check on the operational condition of fire hydrants. The most commonly reported taste and odor problems in Arlington Heights result from two separate and distinct chemical reactions in the water itself.