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    Stillorgan Reservoir Disinfection Upgrade

    Project Details

    Value: €15M
    Year Completed: 2016
    Client: Irish Water


    Michael Joyce
    Michael Cormican

    Project Details

    In 2015, Ryan Hanley was commissioned by Irish Water to design and administer the Stillorgran Reservoir Disinfection Upgrade. The reservoir had been included on the Environmental Protection Agency (EPA)s Remedial Action List (RAL) due to the absence of a Cryptosporidium barrier. The successful implementation of the project, which involved the construction of the largest UV disinfection plant in Ireland, assured the safety of the water supplied to over 200,000 consumers in the Dublin region.

    The benefits to Irish Water and their South Dublin consumers have been:

    • The Stillorgan supply was removed from the EPA RAL thereby securing the safety of the water supply to over 200,000 people.
    • The project ensures that drinking water distributed from the Reservoir meets the Regulations by providing a verifiable primary disinfection system and Cryptosporidium barrier.
    • The adaptation of the existing chlorination system at Stillorgan, as a secondary disinfection system, affords Irish Water and Dublin City Council improved control of chlorine residuals within the five downstream network supply zones supplying Dublin City, Dun Laoghaire and parts of South Co Dublin, thereby quality assuring the safety of the water supply to consumer taps.