St James's Hospital in Dublin says it is currently experiencing a reduction in water pressure due to a leak on site.
The source of the leak is being investigated.
The hospital says it is "working quickly" to restore normal water pressure.
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In a statement it says: "There has been no impact on the delivery of any clinical service at St James's Hospital and the hospital has provided bottled water on-site".
The hospital adds that it has storage capacity on site to deal with situations such as this.