A boil water notice was issued for parts of Limerick on Thursday morning.
All customers served by the Fedamore Public Water Supply have been advised to boil their water before use until further notice.
Approximately 500 people in Fedamore and surrounding areas are affected by the notice after an increase in the turbidity - or cloudiness - was discovered at the underground borehole source which supplies the region.
This has resulted in a risk of the water treatment process becoming compromised.
— Irish Water Care (@IWCare) November 21, 2019
The Health Service Executive is working alongside Limerick City & County Council to resolve the issue as soon as possible, while Irish Water's drinking water compliance and operational experts are on the scene to provide assistance.
Ian O'Mahony, Irish Water's Operations Lead for Limerick, said: "We acknowledge the impact and inconvenience caused by the imposition of a Boil Water Notice to homes and businesses. We wish to thank the community for their patience and cooperation while we work to resolve this issue.
"Our priority is the provision of safe, clean drinking water and safeguarding that water supply for the future is a vital focus."
Irish Water is contacting registered vulnerable customers who have been affected by this notice to advise them personally.