A boil water notice for Ranfurly is to remain in place over the weekend.
Recent heavy rain has put a strain on treatment facilities in the area.
The Central Otago District Council issued the notice on Tuesday afternoon and said water must be boiled when used for drinking, preparing food, cooking and cleaning teeth.
Bring water to a rolling boil and boil for at least a minute, then allow it to cool naturally.
Two smaller drinking water tankers at Maniototo Area School and Maniototo Hospital would be refilled after 1pm today and tested so there was sufficient supply over the weekend, the council said.
A large tanker on Charlemont St was also available for use.