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United Utilities has said there is no timeframe of when the boil-water notice will be lifted in certain towns and cities in Lancashire.
It's two weeks today since the notice went out for homes to boil their water after an outbreak of the Crytosporidium bug was found in the area's water supply.
People in Lancashire have been warned they should continue boiling their tap water before use for several days.
Tests at a water treatment plant found traces of the microscopic bug cryptosporidium, which can cause sickness and diarrhoea.
Water firm United Utilities, which first issued the boiling water advice on Thursday, has warned customers that the situation will continue for a number of days.
Supermarkets in Lancashire have seen their shelves cleared of bottled water amid a safety scare over drinking water in the region.
Thousands of residents have been warned not to drink tap water after traces of microscopic parasite cryptosporidium were found in the water supply at the United Utilities treatment plant in Catterall.
It can cause a severe sickness bug that brings symptoms of cramps, sickness and diarrhoea.
Families across Blackpool, Chorley and Preston are being told to not brush their teeth without boiling the water first, or using the bottled variety.
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