Mullingar and Moate are affected.
Uisce Éireann crews are working to repair a major burst on a trunk main in Westmeath.
The areas impacted are Ballynacarrigy Town, Ballynacarrigy East, Ballynacarrigy South, Moyvore, Ballymore, Moate and surrounding areas.
Repairs are expected to be completed by 6pm this evening.
Crews are also responding to a burst water main that is impacting a small number of properties in Mullingar.
The areas impacted are Clarkemount Avenue, Brosna Grove, Brosna Close, Brosna Lawns, Old Clonmore and surrounding areas.
Works are scheduled to take place until 10am tomorrow.
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