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The Catskill-Delaware Water Ultraviolet Disinfection Facility is an 160,000 square feet (15,000 m2) UV water disinfection plant built in Westchester County, New York to disinfect water for the New York City water supply system. The compound is set to be the largest Ultraviolet germicidal irradiation plant in the world. It has 56 energy efficient UV reactors at a total cost to the city tax payers of $1,600,000,000. Mayor Michael Bloomberg created research groups between 2004-2006 to decide the best, cost effective ways to modernize NYC's water filtration process. To become secondary to the existing chlorination and fluoridation facilities. They had discovered that the cheapest alternatives would cost over $3 billion, other than UV. In response to this, Bloomberg decided to set up a public competitive contract auction. Ontario based Trojan Technologies won the contract. The facility will treat 2.2 billion US gallons (8,300,000 m3) per day. The new facility was set to be in operation by the end of 2012. The facility opened on October 8, 2013.