The Government's latest Three Waters announcement is a step forward for addressing years of Council under-investment in water infrastructure. It's the biggest shake-up of drinking, storm and waste water systems in generations. Under the proposals, there would be four entities - three of which would cover the North Island and the top of the South, and a fourth that would roughly cover the rohe of Ngāi Tahu. RNZ political reporter Anneke Smith speaks to Māni Dunlop.