Saggart Reservoir Project

Uisce Éireann has completed the construction of a new covered treated water reservoir that is equivalent in size to 40 Olympic swimming pools. 

The €59 million investment includes a brand-new, state-of-the-art, 100-million-litre covered reservoir that now stores water produced at the Ballymore Eustace Water Treatment Plant which is home to Ireland’s largest water treatment plant. This upgrade has increased storage capacity, enhanced the security and resilience of the water supply, and improved water quality for the Greater Dublin Area. 

We have now modernised this once aged and damaged infrastructure with a covered reservoir, ensuring that the treated water is securely stored and protected before distribution. 

This project is one of several strategically important water projects in the Greater Dublin Area to ensure a more resilient water supply to homes and businesses in the Greater Dublin Area. Works were delivered on behalf of Uisce Éireann by Coffey Construction Ireland Limited. 

The works carried out as part of this project will now:

• Increase the security and resilience of the drinking water supply to homes and businesses in the Greater Dublin Area.
• The roofed reservoir, spanning an area three times the size of Croke Park, has been planted with wildflower seeds, promoting biodiversity, while protecting the treated drinking water from the elements.
• Facilitate local development in the Greater Dublin Area.

The project involved the construction of:

• A covered reservoir in Saggart that holds 100 million litres of water. 
• A new electro chlorination plant and associated infrastructure.
• A secondary chlorination system to disinfect up to 400 million litres of treated water per day. 
• Associated 1600mm pipework connecting the new reservoir to the supply coming from the Ballymore Eustace Water Treatment Plant 

The Slade Valley Heritage Trail, highlighted in South Dublin County Council’s County Development Plan, is envisioned to connect Rathcoole, Saggart, and Brittas, enhancing the natural beauty and accessibility of these areas. 

As part of the Saggart Reservoir project, we have thoughtfully integrated a corridor along the southern and western boundaries of the site to accommodate this heritage trail. This corridor is carefully designed with security fencing, hedging, and trees to ensure a safe and scenic route, separate from the reservoir.

Once fully developed, this trail will offer a valuable recreational space for the Saggart community and the wider South Dublin area, providing a serene environment for outdoor enjoyment and exploration.