Broken Hill’s water supply has been secured with a 270-kilometre pipeline from the Murray River at Wentworth.

The $500 million project has been officially commissioned by the Deputy Premier John Barilaro and Member for Barwon Kevin Humphries.

“We've been able to finance and construct the largest piece of water infrastructure in rural NSW since the Snowy Hydro,” Mr Humphries said.

Properties on the Darling River and the town of Pooncarie will not be connected to the pipeline, leaving them reliant on dwindling supplies in four temporary block banks.

While Broken Hill’s water supplies are set to improve, many says the NSW Government should focus on the management of the Darling River and Menindee Lakes.

“We've always had a secure water supply from the Darling,” Broken Hill Mayor Darriea Turley said.

“We struggle when there's a drought but certainly that is the issue and the Government should have addressed these issues.”

The Darling River Action Group said removing Broken Hill from the Darling River would leave the Lower Darling River vulnerable, as it will not need as much water coming down to have a guarantee of water for Broken Hill.

“So in essence there'll be less water coming down the Darling River and the Menindee Lakes will be drained a lot quicker,” the group’s spokesperson Tom Kennedy has told the ABC.

The Menindee Lakes - the site of well-publicised mass fish deaths over summer - previously supplied Broken Hill with drinking water.

But Menindee remains reliant on the Darling River, which for some residents shows the Government has given up on their stretch of the river.

Murray River water will now make its way into the Broken Hill water system over the course of about a month.