The story of the $80m Kia Ora water purchase is just the latest in a long line of scandals around the management of the Murray-Darling Basin.
"Billions of dollars of taxpayer money has been spent, and it is clearly not returning water to the river," Greens water spokesperson and Senator for South Australia Sarah Hanson-Young has said.
"This $80m purchase was dodgy from the start. To find out now that the works may not have even been carried out is outrageous.
"Multiple governments and ministers have been involved, the net result is a river system in crisis.
"It's clearer than ever that we need a full Royal Commission into the Murray-Darling Basin. Investigating just one incident will not give Basin communities and Australian taxpayers the answers they deserve.
"The Greens will continue to fight for a Royal Commission, and hold governments to account for the state of our most important river system. If voters want to save the River they have to vote Green on May 18."