Boiled Water Notice To Last Throughout Weekend

Thousands of people in northwest England are being advised to boil their drinking water, after traces of parasites were found in the supply.

Cryptosporidium, which can cause diarrhoea, stomach cramps and vomiting, was detected during routine tests at a water treatment works in Preston (OTC BB: PSNP - news) .

Residents in Blackpool, Preston, Chorley, Fylde, Wyre and South Ribble are affected.

United Utilities (LSE: UU.L - news) is urging customers to boil the water they need for drinking, preparing food and brushing their teeth "as a precaution".

The supplier said it is still safe to wash clothes and bathe as normal, but recommended dishwashers be run as hot as possible (65 degrees or higher).

United Utilities said the warning will remain in place throughout the weekend, and likely into early next week, even though it said that traces of cryptosporidium are "continuing to reduce".

"However, testing will continue and the boiled water notice will not be lifted until United Utilities is absolutely satisfied that the water is back to the usual extremely high standards," the company said in a statement.

It also said investigators were also looking into how the bug found its way into water at the treatment works.

United Utilities said it was trying to inform customers in as many ways as possible - putting cards through letterboxes of affected homes from today, as well as posting advice via social media, newspapers, radio and TV.

In one of several tweets, it told one customer it would deliver water to an elderly woman upset over the incident.

To another customer asking: "What about kids that wash their hands then put their fingers/thumbs in their mouth? Will that transfer the bug?" the company replied: "Re: little ones, try to not put water in mouths".

Leona Worth of Fulwood, Preston, told the Lancashire Evening Post: "I am very concerned I have two young children. I have only just heard about it on the news. I am panicking because I have been drinking water all day.

"I've never heard of this before. I'm a concerned parent."

Carly Whittam, from Woodplumpton, said: "I have been off sick with a virus. I have been in bed all week. I'm concerned that this the water is what has caused it because I’ve been feeling worse again today.

"We won’t be letting the kids drink water."

Martin Padley, the chief scientific officer for United Utilities, thanks customers for their "immense patience".

We apologise for the inconvenience but the health of our customers is absolutely paramount."

In some areas it was reported that supermarket shelves had been stripped of bottled water by concerned customers.

According to United Utilities, cryptosporidium causes a gastrointestinal illness called cryptosporidiosis.

The illness lasts from a week to three weeks in healthy individuals, but "can be prolonged and life threatening in severely immunocompromised individuals", the company said.

Residents in the North West can find out if their supply is affected on the United Utilities website.