The super city proposal would mean urban councillors in Wellington would control roading, water and land use decisions in Wairarapa such as irrigation development, use of fertilisers, water supply and discharges.
"These roles are not only critical to the protection of the environment, but also the functioning of our agricultural economy and rural communities, and we are strongly against outsourcing them to people with the interests of a city at heart," they said.
This is one of the reasons the mayors consider an independent Wairarapa proposal to be better suited to looking after Wairarapa's interests.
"As both the single tier and two tier options are much the same as the proposal produced two years ago by a small clique of councillors and roundly rejected by a majority of the residents of the region, clearly all the community consultation and wishes of the people have been ignored," they said.
Wellington working party chair Ken Douglas said a single council would be better able to realise the region's potential, as well as represent Wellington on the national and international stage.
"One council would deliver many efficiencies - stronger regional leadership, simpler, faster planning, cost savings that could be put back into services, clear accountability for decision-making, better infrastructure and infrastructure planning, to name just a few," he said.
"All that would help to improve the region's performance, which right now is lower than that of any other metropolitan region in the country."
The Wairarapa working party is still waiting for a report by accountants Martin Jenkins on the facts and figures of the preferred option of a Wairarapa unitary authority and it is expected to be available this month.
The next steps in the process will be decided from there.
