"The Board and I look forward to working with Jon as we embark upon the next stage of Watercare's journey, which includes the delivery of an $8 billion capital programme over the next 10 years, the response to the ongoing drought, and the national water reform programme," she said.
Lamonte said he felt "excited to come to New Zealand and forge a new life in Auckland and play my part in ensuring its future".
A council statement says Lamonte has an operational background, serving in the Royal Air Force in the Falklands, the former Yugoslavia and Iraq. It adds that he was CEO of Tubelines in London before taking over all modes of transport in Manchester, and then turning the first metro line in Sydney from construction into operations.
Mayor Phil Goff said Lamonte "had an impressive career and brings to his new role considerable experience as a chief executive and leader, and skills in managing large-scale enterprises and operations".