"Given Robyn Malcolm is clearly so anti the Government and the Prime Minister, she is far too partisan to front this all-important public consultation and plan," Mr Brewer said.
"Her personal politics will really colour this council and the plan itself. It is just not appropriate in local government to employ someone whose politics are so pointed to be fronting a public consultation campaign."
There will be an inference that "this is a zero-waste plan that the Green Party has signed up to" if Malcolm were to front it, he said.
He said because the waste management plan was a statutory requirement of the Government, the campaign should be fronted by someone who was seen as politically impartial.
"The mayor now needs to urgently reconsider whether she is the best ambassador to launch the plan."
But Mr Walters said Malcolm was selected "as a celebrity and well-known supporter of environmental issues".
"Auckland needs to deliver its waste services more efficiently, find better ways to reuse resources and send less waste to landfill, and manage costs," he said.
He said the campaign, including costs, was still being finalised.