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:
Soc Dems Wicklow TD Blasts €19B Electricity Network Upgrade Amid Rising Household Costs
Water Infrastructure Project Plans To Shore Up Wicklow Supply For Decades To Come
Go-Ahead Ireland to Create 400 Jobs Boosting Public Transport in Wicklow
Pat Devlin Calls Time After Four Decades With Bray Wanderers
Wicklow Musician Earns National Business Award For Merging Traditional Culture And Wedding Celebration