Some Narragansett and South Kingstown residents are being warned to boil their tap water.
The Rhode Island Department of Health issued a boil water notice on Friday after e-coli bacteria was found during routine sampling by Suez Water.
The company sells water to four other local systems, serving around 38,000 resident along with restaurants and concession stands.
Water company officials said in a statement that they are investigating the source of contamination, and hope to correct the problem by Wednesday.
The notice will be lifted when water tests come back bacteria-free for three consecutive days.
Local agencies are offering support to residents until the contamination is addressed.
The Kingstown Fire Station invited affected customers to come fill water bottles at the station.
The Rhode Island Emergency Management Agency will provide bottled water to South Kingstown schools, the Senior Center, and Public Housing Authority residents.
And home-bound residents of Narragansett and Kingstown may request to have clean water delivered by contacting town authorities.
Residents who are concerned about their own water can check affected areas on an online map and list of the streets.