He pointed to an upcoming one-day conference in Tauranga - sponsored by the regional council and Tauranga Chamber of Commerce - on February 1, called "Rethinking Local Government in the Bay of Plenty".
Mr Oppatt said talk of a Bay of Plenty "super council" had been around for years but since the Government passed the Local Government Act 2002 and Amendment Act 2012 in December it would be a lot easier to unify local authorities if a strong case was made to do so.
To date, only the Far North District Council has lodged a reorganisation application for it to become a unitary authority.
The Daily Post understands councils in Wellington and the Hawkes Bay are in the process of making similar applications.
"Whether we like it or not, we would have no mayor, no council, rates would go up and Rotorua would lose control of its own future to a Tauranga-based unitary authority.
"The danger is anyone can make an application, any individual or local authority ... we would end up a minnow in a very large council."
An amalgamation would cover the regional council, Tauranga City, Western Bay, Rotorua, Kawerau, Whakatane and Opotiki, he said.
Rotorua residents should think seriously about the future of local government before it was too late.
However, Rotorua Mayor Kevin Winters was quick to quell any talk of a super-council.
He was aware of the conference but believed it would be used only to inform people how the new legislation would impact on the region and the lessons learned in Auckland.
"They will be speaking very generally ... I would be surprised if any details of a super council would be discussed."
The region's mayors had a "no surprises" clause in place under the Bay of Plenty Triennial Agreement - which is signed by all the region's mayors - and at their latest meeting on November 29 no discussions were held regarding a unitary authority for the Bay, he said.
"We are sitting back and watching to see how Auckland shakes down ... we are in no hurry.
Regional council chairman John Cronin said the conference was organised to inform the community about the changes in legislation and what options were available in the future. "If we can do it better then we owe it to our ratepayers to discuss any options available. Some of our operations could be better managed locally and at a cheaper cost. It is our responsibility to make sure we look at all the alternatives for ratepayers."
Mr Cronin said he could not see the region rushing into anything.
Tauranga Mayor Stuart Crosby said there had been no discussion, at any level, regarding a unitary authority.
"I've seen proposals come and go ... but all have failed due to representation issues," he said.
