"The Te Rūnanga o Ngāti Awa Board which represents 22 hapū of Ngāti Awa unanimously support the appeal because they are seriously concerned about the irreversible harm to this aquifer, the people and the land, and the undermining of our status as kaitiaki and tangata whenua," Simpson said.
Whakatāne district councillor and neighbouring property owner to Otakiri Springs, Mike Van der Boom, said Sustainable Otakiri was confident there were two or three points throughout the resource consent that weren't done "quite right".
"One thing about the appeal process is you have to be really certain you have a case," Van der Boom said.
Sustainable Otakiri has been formed as an Incorporated Society for the appeal process.
Organisers are planning another public meeting and are still looking for an acoustical engineer to help with their appeal.
A Givealittle page - Save our Water Otakiri - has also been launched in the hope $10,000 can be raised by the end of the month to pay for legal fees and expert witnesses.
Creswell managing director Michael Gleissner has acknowledged the three appeals and said he would take his time to consider the matters raised.
"It's important we have a robust process to ensure the right decisions are made and these appeals are part of that process.
"We're going to take our time considering their filings and we remain open to talking with all the parties concerned while this process continues."