By RNZ
Waikato-Tainui says it will appeal against a decision that doubles the volume of water allowed to be taken from the Waikato River.
A board of inquiry last month granted Watercare resource consent to withdraw 150 million more litres a day for the Auckland supply.
Watercare is now allowed to take 300 million litres of water a day from the Waikato River year-round, with operational consent for the next 20 years.
Waikato-Tainui chairwoman Linda Te Aho said the board of inquiry's ruling offered some concessions, but the iwi was still concerned it undermined the river and those who live along it.