TWEED Shire Council's backing for a dam at Byrrill Creek will be reconsidered at its meeting on Tuesday, with mayor Barry Longland backing a motion to withdraw the council's support.

But in a surprise twist Councillor Joan van Lieshout, who abstained from previous votes on it has declared she is concerned about water security and could vote this time.

Cr Longland, Cr Katie Milne and Cr Dot Holdom were signatories to a rescission motion going to Tuesday's meeting to undo the October 2010 decision to build a dam on Byrrill Creek.

The same three attempted to overturn the dam decision at a special council meeting on November 1.

The initial council vote split 3-3 with Cr Joan van Lieshout abstaining.

The Byrrill Creek option was adopted after then-mayor Kevin Skinner cast his deciding vote for the project.

Cr van Lieshout said she would consider voting on the rescission motion on Tuesday.

"I think with all the pandering around, maybe I should have a vote," Cr van Lieshout said.

Ms van Lieshout did not believe she had a conflict of interest in this issue.

"I have always considered the community and securing water is a very important issue to me," she said.

"I didn't vote before because it was the pressure put on me.

"I couldn't say which way I would vote because I have been out of the debate."

The rescission motion was put up after the council received a letter from the NSW Minister of Primary Industries Katrina Hodgkinson stating that it would not interfere with the council process and would make a decision after the council's process was complete.

Cr Longland said the communication received from the minister "was significant".

"The review of the water plan left some doubt about the extent that it would impact or not impact on the council's decision," Cr Longland said.

"We, as a council, have to decide on what option we want to do."

Cr Warren Polglase previously voted for the Byrrill Creek project and he said yesterday he would do the same next week.

Cr Dot Holdom said she would support the rescission motion, while Cr Phil Youngblutt said he hoped it would fail.

The Daily News was unable to contact Cr Katie Milne.