Water samples taken on July 11 detected E.coli and total coliform bacteria in the downtown district’s water supply.
That privately-run water supply services about 30 to 40 homes in the center of town.
The order was issued by the Massachusetts Department of Environmental Protection.
It directs residents in the district to bring the water to a rolling boil for at least one minute.
After it’s been boiled the water can be used for drinking, making ice, brushing teeth, washing dishes and food preparation.
It’s unclear how long the order will be in place.
The water in the remainder of town, that is part of the Whately Water District, remains clear.