Regional councillor Tom Belford has resigned from Transparent Hawke's Bay but continues to deny any conflict of interest between his roles with the council and the advocacy group which opposed the Ruataniwha dam.
His resignation has not appeased Regional Council chairman Fenton Wilson who last week pushed Mr Belford to formally declare his interest in Transparent Hawke's Bay.
The regional council is due to vote next month on whether to invest up to $80 million in the Ruataniwha water storage scheme.
Mr Belford spoke on behalf of Transparent Hawke's Bay at a board of inquiry hearing in January. The group's written submission to the board said it opposed the dam.
Mr Wilson said last week guidelines from the Office of the Auditor General made it clear that a councillor should not make a submission on a issue their council was determining and he suggested Mr Belford should not vote on Ruataniwha matters.