Irish Water has issued a boil water notice for those in the Lismore Deerpark supply effective immediately.
The notice comes into place due to issues at the water treatment plant where Irish Water and members of Waterford County Council are currently investigating the issue.
The notice will remain in place until further notice.
Residents in affected areas should boil all water to be used for drinking, making ice, washing food and brushing teeth.
More information can be found on Irish Water's website.