There is a boil water advisory for people who use the Huron Sands well in Ashfield-Colbourne-Wawanosh.
The advisory comes after a water-main break and will stay in effect until samples have been taken and cleared by Huron-Perth Public Health.
Residents are being asked to boil water for at least one minute before consuming, washing food or brushing teeth.
Water is considered safe for bathing, laundry and dish washing.
