Swimmers are being warned to stay away from part of Lake Taupō after a "fat-berg" produced by waste and wipes caused wastewater to spill into the lake.
The blockage led to wastewater bursting from under the manhole cover and running into the lake at the end of Hawai St, near Two Mile Bay.
Water samples were being tested from the area and the results of these were due tomorrow.
A temporary health warning was in place cautioning people not to swim in the area until the results of the testing were known.
Taupō District Council was assuring locals the spill did not affect the Two Mile Bay Sailing Centre - rather, the affected area was immediately around the outlet.