The outbreak is s one of the biggest single instances of waterborne disease in New Zealand history. At least two thousand people are ill after the bug contaminated the drinking water supply.
Hawke's Bay DHB still has a 'boil water' notice in place and the Hastings Council is still trying to identify the source of the contamination.
But what liability, if any, could the council face?
Martin Williams is the former president of the Resource Management Law Association and barrister specialising in local government and environmental law