Consent for the application was granted by independent commissioners despite a weight of submissions against the proposal.
There were 37 submissions from the public and 33 were against it.
"I don't think commissioners from outside Whanganui should be able to give consent for a proposal like that," Mair said.
Aquifer 182 was co-founded by Whanganui man Geoff Murdoch, who is one of three local directors, along with Marshall Tangaroa and Declan Rogers, who collectively hold 50 per cent of the company's shares.
The other 50 per cent is owned by the unnamed offshore shareholder.
The 15-day appeal period for resource consent has now lapsed, and Mair said he believed a number of submissions had been made.
"I'm not optimistic that they will be successful, and I think the community needs to come together and make a noise about it, because this water is coming from our rohe, our place, and it shouldn't be happening.
"Nau mai, haere mai - come along to the meeting to share your thoughts and find out more."
Aquifer 182 director Marshall Tangaroa was contacted but declined to comment.
The meeting will be held at 5.30pm at the Whanganui War Memorial Centre on Wednesday, October 12.