It takes about four hours to complete this process. Water at the very top of the basin then moves to a large gravity filter. After the water is filtered, chlorine is added to kill any disease causing bacteria. Fluoride also is added to help prevent tooth decay. After water has completed the treatment process, it is referred to as finished or potable water.
Most people simply call it drinking water.
The total treatment process takes five to eight hours. Click here to view a map of the water treatment plant locations .