NEW YORK — The world's largest ultraviolet (UV) treatment facility, which will serve nine million residents in New York City and Westchester County, has been completed, according to a press release.

The 270,000 square-foot Catskill/ Delaware UV Facility took $1.5 billion to build, the release reported, and will treat two billion gallons of water each day.

"[This facility] is the first milestone in the fundamental transformation of New York City's water supply led by Mayor Bloomberg over the past decade," said Deputy Mayor for Operations Cas Holloway.  "New York's water is the best in the world, and now every gallon that travels from the upstate watershed to the City will be treated with ultra-violet light."

According to the release, New York City committed to building the facility in 2002 to guard against Cryptosporidium and Giardia microorganisms; construction began in 2006 and water began being treated there in 2012.

The Catskill/ Delaware UV Facility is located in the towns of Mount Pleasant and Greenburgh in Westchester County, the release reported.

Please visit http://www.nyc.gov/html/dep/html/press_releases/13-104pr.shtml to read the full release.