The Vartry Water Scheme which supplies 200,000 people in north Wicklow and south Dublin was built in 1868 and was in "urgent need of improvement" according to Irish Water.
It was built because of campaigning by Sir John Grey a doctor who is honoured by a statue in O'Connell Street. The new plant follows incidents at plants in Gorey, Co Wexford and Ballymore Eustace in Kildare that led to 52 people falling ill last August. He said construction has started on a new wastewater treatment plant in Arklow that will cost €139 million and will stop sewage being pumped into the Avoca River.
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