"It's frankly unconscionable that the Hastings District Council are using ratepayer money to fund a lobbying effort to suit its own means," he said.
"Maybe there are benefits to amalgamation, but the case should be made by chambers of commerce and community groups, not a propaganda campaign underwritten by Hastings' ratepayers."
In response to Mr Williams' comments, Mr Yule said his council's decision to set money aside for the amalgamation campaign was no different from the actions of Napier City Council which had spent a similar amount on a consultant's report which supported its stance against amalgamation.
"We're simply spending our money to explain the reasons why the council is supporting the stance it is, and we're doing that in an informative and educative way," Mr Yule said.
"It's not as if we're out of kilter here, we just haven't done anything up until now."
Mr Jordan said there was evidence that "bigger was not always better" when it came to the economics of amalgamation.
He cited a report commissioned by the Hutt City Council, which has been fighting a proposal to amalgamate local authorities in the Wellington region.
He said the Hutt City research found council costs per ratepayer could drop as the population within a local authority area grew towards 40,000 "but above 200,000 scale-inefficiency starts to bite".