How is the decision made to lift a boil water advisory?
The Ontario Drinking Water Objectives (ODWO) state that the Medical Officer of Health should continue the boil water advisory until two consecutive sets of samples taken from all parts of the water system that has been affected show the water is safe for drinking. The ODWO address issues that can affect health, such as the presence of E. coli. The Medical Officer of Health may choose not to lift the boil water advisory even if two acceptable samples are obtained.
