Every water treatment plant in the country is to be audited after unsafe drinking water entered supply last month.
52 people became ill after drinking contaminated water that came from a plant in Gorey, Co Wexford, while a plant in Ballymore Eustace, which services part of Dublin, produced unsafe water for 10 hours one day last month.
An Forum Uisce says Irish Water's delays in informing the EPA and HSE are unacceptable and clearly put the public at risk.
The Minister with responsibility for Irish Water Daragh O'Brien says the audits will start today.
Meanwhile, the Environment Minister says under-investment in the water system is not a good enough reason for unsafe water to enter the drinking supply.
Environment Minister Eamon Ryan says under investment is not an excuse.
An Forum Uisce says Irish Water's delays in informing the EPA and HSE are unacceptable and clearly put the public at risk, and further erodes public confidence in the utility.