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.
Two People Taken To Hospital Following Westmeath Crash
GoFundMe Campaign Raises Nearly €19k For Family Of Melissa Brewer
Researchers Call For Lower Limits On National Lottery Spending
Deliveroo Explores Return Of Drone Deliveries To Ireland
TUS Secures Almost €3m In Government Funding
National Lung Cancer Screening Programme Sought By Irish Cancer Society
Anti-Social Behaviour Escalating In Midlands
Parts Of Midlands Under Status Yellow Fog Warning