At this stage Ngati Whatua have signed a framework agreement with the Crown which outlines key elements to be negotiated.
The framework documents the intention for the development of a co-governance body consisting of the four relevant councils, hapu and iwi.
Mr Ramsey said Ngati Whatua and the four councils had been working towards improving the health of the Kaipara Harbour through the Integrated Kaipara Harbour Management Group.
A Treaty settlement would strengthen the work they are doing, he said.
"Sedimentation is a big problem, all you have to do is take a look at some parts of the harbour. There are new aquatic pests ... The health of the Kaipara Harbour is not good."
The MOU has not yet been signed by the council but Mr Ramsey said it was likely the Northland Regional Council would sign it. The MOU would include establishing a Kaipara Moana Negotiations Working Party comprising at least one elected representative from each council.