Annual Drinking Water Quality Report For 2007

Water Treatment
Shaft 22 water is fluoridated and chlorinated by New York City at Kensico Reservoir.  Caustic soda is added at Shaft 22 to increase the pH of the water.  The WJWW provides additional chlorination at its Larchmont Station and adds a blended poly-orthophosphate as a corrosion inhibitor at that point.

The Rye Lake Station, furnishes WJWW system with water that is fluoridated, chlorinated and provided with a blended poly-orthophosphate at the source.  After the water passes through the Purchase Tanks on Purchase Street in the Town of Harrison, caustic soda is added for pH control.