Some residents in Leamington are being asked to bring their water to a hard boil for a full minute, or use bottled water until further notice.
The Windsor-Essex County Health Unit has issued a boil water advisory for the following streets:
* 222 to 298 Cotterie Park * 4 to 22 Silver Avenue * 2 Carr Avenue * 3 to 23 Julien Avenue * 2126 to 2235 Mersea Road 2
Those customers are all serviced by the Wheatley Drinking Water System.
It said water samples came back with abnormal results.