A rāhui has been placed on parts of Lake Taupō and the upper Waikato River following the wastewater spill on Tuesday.
Tūwharetoa Māori Trust Board imposed the rāhui from 9am today and said it would remain in place until it deemed appropriate to lift it.
The equivalent of about a third of an Olympic-sized swimming pool of waste, including sewage (about 880,000 litres), flowed into Lake Taupō over a 90-minute period after a water main burst creating a washout that broke a sewerage pipe.
Taupō District Council, Waikato Regional Council and the board - which owns the lakebed - are looking at some cleanup measures for the spill, which spread along 200m of the lakefront and down Waikato River.