Residents are being asked to boil their water for a least one minute before drinking, cooking and brushing teeth.
The council is advising residents to boil their water for at least a minute.
Liane, 6, and two-year-old twins Maya and Karla died last week.
Police have clarified one of the kids was six, and two others aged two.
He was able to throw his son to safety, but couldn't get back to shore himself.
The botched attempt to tell people the cinema is closed until level 2 included some colourful language.
"If you hear that your son is involved in this, please discourage him from attending."
Emergency services rushed to the incident.
"When these ships come to New Zealand, people protest, because they’re appalled by this cruel trade."