Collectively they employ around 3000 staff and about 600 are based in Wairarapa.
They are less than half the size of Capital and Coast DHB, but when all three DHBs work together they are able to support the regional population.
"The relatively small size of both DHBs allows more direct communication both within the organisations and with the local communities.
"The closer working relationship between the three DHBs depends on using all the existing capacity in the region. It does not signal hospital closure. It's about making best use of what we've got, so we don't duplicate expensive hospital services unnecessarily," he said.
Mr Dyer said the process of amalgamating the executive management teams of the Wairarapa and Hutt Valley DHBs is under way and should be completed by the end of March.