The pricing structures set at Irish Water will face tough questions later, by the Dail's Environment Committee.

The Chairperson of the Commission for Energy Regulation is likely be asked about 'performance bonuses' to senior staff at the utility.

It's expected customers will receive their first bills at the start of next year, based on usage for the last three months of this year.

Committee Chairman, Deputy Michael McCarthy, says they want to know how charges will be set: