About 15,000 householders in the Knocknacarra area of Galway city, Ireland, have been warned to boil tap water before drinking it or using it to prepare food.
RTE News reports that the Galway City Council issued the boil water notice after receiving advice from the local Health Service Executive.
Reports indicate that the water has been contaminated by E-Coli, but the issue is not related to the recent water contamination caused by the cryptosporidium bug that left thousands sick.
Instead, officials believe that the problem stems from excavation work being carried out nearby.
No illnesses have been reported, and the water supply is currently being treated.
Up to 90,000 households in the city and county had to boil or buy bottled water for more than four months as a result of the cryptosporidium outbreak, which was finally cleared up last month.