An audit of all the nation's Water Treatment Plants is to be undertaken, following the contamination of water supplies in Dublin and Wexford last month.
The Environmental Protection Agency says the "serious incidents" took place last month at a plant in Wexford which serves Gorey, and Ballymore Eustace which serves parts of Dublin.
It says there were also "abject failures" by Irish Water and the local authorities in notifying the EPA and the HSE about the failures, which affected 900,000 water consumers.
The Housing and Local Government Minister, Dartagh O'Brien, met with Irish Water and two local authorities this morning after more than 50 people took ill due to contaminated drinking water.
In response, the plants will be checked that the proper processes are in place for dealing with incidents and escalating incidents, with staff to be given refresher training on reporting issues.
Wexford County Councillor Andrew Bolger says the advice given to him was the tap water was safe, but locals were ending up in hospital.
"There are certain questions that have to be asked here because the advice I was given was to tell people that the water was safe when it has since turned out that there was actually an issue with the water and the people of Gorey were correct in saying that the water was unsafe."
Bolger says local representatives are to meet with Irish Water again on Monday.
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