Residents in parts of Lee-on-the-Solent are being told to boil their water after traces of E.coli and coliforms were found in a sample taken from a fire hydrant.
The sample was collected from a hydrant in Martin Close during routine water quality testing over the weekend.
Portsmouth Water said further samples taken from nearby hydrants, customers' homes, treatment works and service reservoirs had tested clear.
The company believes the initial positive result may have been caused by external contamination of the sample.
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However, as a precaution, residents in Martin Close, Bullfinch Court, Magpie Lane and Chaffinch Way have been told to continue boiling water before drinking it, cooking, washing dishes or giving it to pets.
Bottled water is being provided to affected customers while further tests are carried out.
The company expects to have more information on Tuesday, October 20, when the latest samples undergo further analysis.
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