A boil water advisory was issued for some residents of Prudence Island.
E. coli bacteria was found in a sample collected from the storage tank of the Prudence Island Water District.
The advisory covers as many as 700 residents.
The Rhode Island Department of Health posted a list of streets covered by the advisory.
The state Department of Health said the water district recommends that customers boil vigorously, for at least one minute, all water used for consumption.
Customers can also use bottled water.
The boil water advisory does not apply to residents with private wells or on Prudence Park Water Coop.
Customers with questions can call the Prudence Island Water District at 401-285-6192.