Joan Burton (Dublin West, Labour) | Oireachtas source

The Senator is well aware that, as I said in direct response to his question, the PPS number is no longer required by Irish Water. However, if and when people wish to apply for a water conservation grant as with other payments from the Department of Social Protection or interaction with the Revenue Commissioners and the tax authorities in general, they would of course use their PPS number - that is the person who is paying on behalf of the household and who has applied.