The current and former Member for Murray have clashed over the future of the Murray Darling Basin Plan, even though they both support plans for a royal commission.
It comes after ALP water spokesman Clayton Barr's motion for a royal commission into the Basin Plan was voted down in state parliament by the Liberals and Nationals.
Member for Murray Helen Dalton said it was "rank hyprocrisy" from Nationals leader John Barilaro, who previously said the Basin Plan was "untenable".
"Barilaro talks big in the bush - he said he would support a royal commission, but then he backflips in Macquarie Street," Mrs Dalton said.
"We keep discovering the complexity and depth of the corruption, and I think we need to open it up and have a good look at it."
Former Member for Murray Austin Evans said if it were up to him he would support a royal commission, but not if it was on Labor or the Greens' terms.
"While I'm in favour of a royal commission you've got to get the terms of reference right," Mr Evans said.
"You've got to be very careful who go to bed with; the Greens aren't supporting a Royal Commission for the sake of irrigation areas."
He said that a Labor-led royal commission could lead to a repeat of the "clearly biased" South Australian royal commission.
Mr Evans said Mrs Dalton was allying herself with Labor and the Greens, who voted in favour of the motion.
Mrs Dalton hit back at the suggestion she was cosying up to Labor or the Greens.
"I'm not in bed with anyone - I want a better outcome for the electorate," she said.
She insisted Murray irrigators had "nothing to lose" from a royal commission, especially given their current zero allocations.
Mr Barilaro stood by his decision to vote against a royal commission.
"A royal commission might be politically popular but it will not deliver an extra drop of water back to the system," Mr Barilaro said.
"We have been vocal in saying NSW cannot afford to see any further water removed from our state to be flushed down to South Australia."
He said the drought "highlighted the deficiencies" in the Basin Plan, but insisted a royal commission was not the answer.
"We will continue to work on implementing measures such as the development of water resource plans and measures to deal with fish kills in the Northern Basin," he said.
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