The Lough Mask Water Main Extension from Ballyhaunis to Ballinlough and Williamstown has officially been opened.
It will ensure that there is clean drinking water for the five thousand consumers on the two supplies.
The major project included the construction of a pumping station at the Ballyhaunis Reservoir.
Minister Ciaran Cannon, who attended the opening, said: “I was very pleased to officially open the Lough Mask Water Main Extension from Ballyhaunis to Ballinlough and Williamstown, along with the Cathaoirligh of Mayo, Galway and Roscommon County Councils.
“This project represents an investment of €10 million to ensure a clean and secure supply of drinking water for the 5,000 consumers on the two supplies and was also responsible for the removal of the long-standing boil water notice in Ballinlough affecting 3,600 of those consumers.
“It also ensures compliance with requirements set out in the European Union Drinking Water Directive and National Drinking Water Regulations.”
Minister Cannon said that he is delighted that the completion of works will now bring to a conclusion the long-standing issues over water quality for the communities affected.
“This project was a perfect example of the power of Irish Water to bring together a number of local authorities in collaboration with one another to solve a major water supply issue,” added the Galway East TD.