A photo of the Dunedin water from the contamination last night (left) and clean water. Photo: Simon Hill : Boil water until at least Friday: Council

Dunedin City Council contractors flush water out of a water main on Malvern St in an effort to clear the contamination. Photo: Craig Baxter : Boil water until at least Friday: Council

The Dunedin City Council's boil water notice has resulted in a rush of people buying bottled water. Photo: Louise Frampton : Boil water until at least Friday: Council

By lunch time the shelves at Dunedin central's Countdown were almost empty of bottled water. Photo: David Loughrey : Boil water until at least Friday: Council

A hospitality worker gets water from a tanker in the Octagon. Photo: Chris Morris : Boil water until at least Friday: Council