Irish Water is expected to say that the current management system which operates water treatment plants, is no longer fit for purpose, when it goes before TDs and Senators later.
The utility will tell an Oireachtas committee there's an urgent need for change.
It follows two incidents in Dublin and Wexford last month which saw contaminated water enter public supplies.
Chair of the Housing committee, Wicklow T.D. Steven Matthews, says what happened is unacceptable:
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