Water services will be amalgamated into four super entities charged with investing $125 billion to $185 billion over the next 30 years, Stuff reports. The government is hopeful it will save households thousands of dollars a year in water bills. The first two entities will encompass Northland and Auckland, and the centre of the North Island respectively with the latter including Tauranga and the Bay of Plenty. The third will take the east coast down to Wellington plus the top of the South Island, specifically Nelson and Marlborough. The final entity covers the rest of the South Island.