Dublin’s water supply is at capacity, the Shannon pipeline is years from delivery, and the consequences for housing and investment are already being felt.
It may seem hard to believe after almost two months of near-continuous rain at the start of the year, but the Greater Dublin Area faces a water crisis that no amount of wet weather can fix. The water infrastructure serving Dublin was essentially designed for 500,000 people and is now serving a population three times that size and growing.
The consequences for the State’s housing ambitions and its capacity to attract and retain foreign investment are more serious than is generally acknowledged.
The river Liffey supplies around 85 per cent of the water requirements for 1.7 million people across Dublin, Meath, Kildare and Wicklow, with no fallback in the event of contamination or prolonged drought. Meanwhile, approximately a third of all treated water is still lost through leaks before it reaches the tap, down from 49 per cent a decade ago.
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In November 2025, Uisce Éireann was fined €20 million by the Commission for Regulation of Utilities for missing its leakage reduction target, having saved only 90 million litres against a required 176 million litres over the previous four years.
The fragility of the system was demonstrated last August, when Uisce Éireann shut down the pipeline connecting Ballymore Eustace water treatment plant with the Saggart Reservoir, a pipe that supplies one third of the Greater Dublin Area’s drinking water, to carry out emergency repairs.
Specialist crews had 28 hours to fix five leaks and replace 35 metres of damaged pipeline before treated water storage levels would fall low enough to cause widespread outages across Dublin, Kildare and Wicklow. The pipeline was likely to burst if not fixed. Had it done so, repairs could have taken weeks and affected up to 1.7 million people. The repairs were completed in time, but the episode illustrated how close to the edge the system is already operating.
The long-term solution is the proposed Shannon water supply project: a 170km pipeline from Parteen Basin in Co Tipperary to a reservoir at Peamount in south Dublin. The planning application, running to more than 500 documents, was lodged with An Coimisiún Pleanála in December 2025. If permission is granted without delay, construction will begin in 2028 and take five years to complete. The project has been in development since the mid-1990s, and its estimated cost has grown from an initial €500 million to between €4.6 billion and €6 billion, with the secretary general of the Department of Housing noting it could reach €10.4 billion once delays and redesigns are priced in.
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The project faces organised local opposition in Co Tipperary and the likelihood of lengthy judicial review challenges that have delayed the delivery timeline of virtually every major infrastructure project in the State in recent decades.
The consequences of delay are already materialising. Uisce Éireann can currently supply only 35,000 new homes with water per year, against a Government target of 50,000. By 2028 it may be unable to grant new connections to the wastewater network in parts of the Greater Dublin Area. The programme for government commits to 300,000 new homes by 2030, with half of those in the Greater Dublin Area, the very region where supply is most constrained. Non-domestic water demand in the east and midlands region is projected to grow by 73 per cent by 2050, and water scarcity is already a factor in investment location decisions.
The funding commitment is substantial; the water sector is to receive €12.2 billion in capital investment between 2026 and 2030. The question is whether money alone is sufficient when the planning and consenting system remains the principal constraint on delivery.
Interim measures could buy time: accelerated leakage reduction; water efficiency requirements for data centres and pharmaceutical plants; rainwater harvesting requirements in new builds; and expanded wastewater reuse. The Republic reuses a negligible fraction of its treated wastewater compared to EU peers; member states including Cyprus and Malta already reuse the majority of theirs. None of these initiatives would be a substitute for the Shannon scheme, but they could reduce pressure on a system that is already at its limits.
By 2044, it is estimated that 34 per cent more water will be needed than is currently available. The Shannon scheme, if it proceeds on schedule, will deliver its first water around 2033. In any dry period in the interim, the gap between the amount of water needed and the amount that can be provided will become very apparent very quickly.
