The utility is due to discuss the matter with an Oireachtas Committee this afternoon.
The current water supply for the midlands and the east of the country is too dependent on the River Liffey according to Uisce Éireann.
The utility will tell politicians today that a new supply from the River Shannon is needed urgently.
The CEO of Uisce Éireann will tell an Oireachtas Committee this afternoon that the River Liffey is extremely sensitive to drought and contamination.
It's the main water supply source for 1.7 million people in the Greater Dublin Area.
The utility is concerned the supply can't meet the needs of Ireland's growing population.
It says the Water Supply Project - that will see water piped from the River Shannon to a reservoir at Peamount in Dublin - must proceed urgently.
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