New York American Water Thursday officially unveiled a $7.5 million groundwater treatment facility in Lynbrook meant to target discoloration caused by iron.

The 4,200-square-foot facility on Whitehall Street was designed to improve water quality by reducing iron levels in treated groundwater to lessen issues that can stain laundry, American Water officials said.

"It's continuing our ongoing battle to control the iron that is naturally found in our wells on Long Island," said Brian Bruce, the company's vice president of operations. "We have already received positive feedback from the customers in the local area."

Bruce and other American Water representatives were joined Thursday by Hempstead Town Supervisor Kate Murray and other officials and community leaders in a ribbon-cutting ceremony and tour of the facility. The plant, which began to operate in November, serves the northern side of Lynbrook village and the southern side of Malverne, Bruce said.

New York American Water, a subsidiary of Voorhees, N.J.-based American Water, is New York's largest investor-owned water company, providing water services to more than 370,000 people in more than 50 communities.

"The bottom line is that it helps our residents have cleaner and safer drinking water," Murray said. "This iron-removal facility is a great step forward in ensuring cleaner, healthier water for all of our customers."

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As part of the three-year project, American Water constructed the new building, replaced a well, rehabilitated a well, and installed automatic filter controls, new chemical treatment systems and a new plant electrical system. It also installed an emergency power generator that can run for up to 72 hours, and a new system to help maintain service during power outages, company officials said.

In the past two years, American Water has invested more than $39 million in infrastructure improvements throughout Nassau. The projects are being paid for with surcharges to ratepayers, Bruce said.

American Water owns and operates 10 iron removal treatment plants in Nassau, including four built since 2004. A facility under construction in South Hempstead is expected to come online in 2016, Bruce said.

CORRECTION: An earlier version of this article gave the wrong location for an American Water facility that is under construction and is expected to come online in 2016. It is being built in South Hempstead, not North Lynbrook.