BRIDGEPORT — Aquarion Water Co. on Tuesday completed the purchase of United  Water Connecticut, giving the company 21,000 new customers in the towns of  Bethel, Brookfield, Newtown, New Milford and Woodbury.

With the deal, the Bridgeport-based utility now serves 625,000 people in 47  Connecticut communities, in addition to its service areas in Massachusetts and  New Hampshire.

“Aquarion has an excellent record for providing safe, high-quality water and  great customer service,” Brookfield  First Selectman Bill Davidson said. “This purchase … combined with  Aquarion’s other recent water company acquisitions, is good for Brookfield and  the entire Danbury area.”

The company, which is the largest investor-owned water company New England  and one of the seven largest in the country, recently bought the Meckauer  Water Co. in Bethel and has acquired 56 other water systems in the past two  years, according to Charles  Firlotte, its president and CEO.

“As a regional water supplier, we will have the opportunity to act as a  resource for these towns and work with them to help improve the overall water  infrastructure in western Connecticut,” Firlotte said.

United Water will continue to operate in Connecticut through its  public-private partnerships with the towns of Newtown, Ridgefield, Sharon,  Killingly, Weston and Stonington, Aquarion said in the statement announcing  the deal.