Irish Water is planning to invest almost €1.8 billion in water and waste treatment improvements over the next three years.
The investment will deliver much-needed improvements in drinking water quality, leakage, water availability, and waste water compliance.
Five months after being set up by the Government, Irish Water is now taking control and increasing the water infrastructure programmes of Ireland's 34 local authorities.
The programme is going to cost €1.77 billion in the first three years, but there will be billions more spent over the following five or six years.
That represents a boost in investment for the economy with more than 380 separate projects listed.
The priorities include eliminating boil water notices in Roscommon, providing more water, and reducing disruptions to water supply in the Dublin area.
Improving water quality, increasing waste water treatment capacity, and improving environmental compliance are also priorities.
A programme to tackle leakages is included with more than 700 million litres of water per day being lost through leaking water pipes.
Irish Water said the leakage programme, combined with the completion of existing works at Ballymore Eustace and Leixlip, will solve Dublin's water issue in the short-term.
However, it said that the project to divert water from the River Shannon to the Greater Dublin Area will still be required in the medium-term.