A water company is still waiting to lift a ban on drinking tap water for three-quarters of the people affected in a contamination scare, its spokesman said.
Anglian Water said they were still confident the boil notice would shortly be lifted for 75% of residents affected.
The spokesman said: "We are still confident that in the not-so-distant future we will be able to lift the notice. In terms of time-scale, we are due some sample results about now. They then go to all the relevant health bodies who will examine them and decide exactly what course of action they recommend we take."
He added: "It depends how long that takes as to when we make the announcement."
The spokesman said he hoped it would be made within the next few hours.
Around 250,000 people were warned to boil their tap water last week after tests showed it was contaminated with cryptosporidium.
The microscopic parasite can cause severe stomach upsets, especially in young or elderly people.
The announcement led to schools being closed, supermarkets running out of bottled water, and warnings that the crisis could last for weeks.
The company isolated the contamination to the Pitsford Water Treatment Works, and treated it with ultraviolet light
Environment, Food and Rural Affairs Secretary Hilary Benn on Thursday said he had been told by the Chief Inspector of Drinking Water is that there was no contamination of the water supply, but he praised agencies for working "extremely well".