The Victorian Farmers Federation wants the controversial north-south pipeline to be switched off once the state's floodwaters subside.
VFF president Andrew Broad said Melbourne's water supply was now secure and could survive until the $3.5 billion desalination plant began operating next year.
Mr Broad said it was appropriate to keep the pipeline running until the floodwaters had eased, but should then be "turned off for a number of years."
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"It was always justifiably built as an emergency for Melbourne's water supply," he told AAP.
"But Melbourne's catchments now have enough water until the desalination plant comes online.
"It's the right thing to do given the seasonal conditions and governments should be responsive to the seasonal conditions."
The $750 million, 70km north-south pipeline was turned on in February and aimed to pump 75 billion litres from the Goulburn River to the Sugarloaf Reservoir on Melbourne's north-eastern fringe.
Even if the water was no longer needed to boost Melbourne's supply, it was to be stored in Lake Eildon and on-sold or released into rivers.
The pipeline has angered farmers in the state's north who say they need the Goulburn River water for their crops.
At the time it was launched, Premier John Brumby said: "I don't believe the pipe will ever be redundant".
Mr Broad said he had not spoken with the government about shutting off the pipeline, and he held out little hope his plea would be taken up.
"I could give Tim (Holding, Water Minister) a call, but I know his response," he said.
