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Wellesley residents and businesses are being told to boil their water before using after a test detected E. coli at a town reservoir.
The notice issued on Thursday urges all Wellesley water customers to boil tap water for at least one minute before drinking or use in food preparation or other purposes such as brushing teeth.
Officials are trying to determine the source of the contamination. They say while the potential risks are relatively low, the town wanted to take every precaution to protect public health.