€80m – Stillorgan  Reservoir

One of Irelands Main Civil Engineering Contractor’s has been appointed for the design, construction and commissioning of a new covered storage reservoir at Stillorgan that will safeguard the drinking water supply for 200,000 people in south Dublin.


The Stillorgan reservoir has served the community for over 150 years and this project will ensure it continues to do so.


Head of major projects at Irish Water Geoff O'Sullivan said safeguarding the quality of drinking water was a "top priority" for the company.


"We have committed to investing €80m to ensure the upgrade to the reservoir provides the long-term solution that is required to secure the water supply,"


The Key Facts:


The utility plans to build a covered reservoir that can store 160 million litres, which is around two days' supply.


Works will take up to two years to complete and will involve building three water storage cells in a flat-roofed building measuring 275 metres by 174 metres.


The covered treated drinking water reservoir will cover an area of 3.1066ha


The new reservoir will replace the existing three open reservoirs. The existing open storage reservoirs, gray reservoir, upper reservoir and lower reservoir will be drained decommissioned and landscaped.


Irish Water said the covered reservoir was "essential" to safeguard the quality of the drinking water.

"Irish Water has already invested €3.4m in a new system to improve the disinfection of drinking water stored in the Stillorgan Reservoir," it said.

"Following this investment ... the long-term solution to upgrade the reservoir is now being progressed."


It is considered "critical" to the continued supply and quality of water in the region, and the development is supported by the Environmental Protection Agency (EPA) and HSE.


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