Irish Water says it has registered around 760,500 households to date, representing 56.3% of the estimated number liable for water charges.
The body says somewhere in the region of 975,000 application packs have been returned so far, approximately 12% of which were from homes using a private well.
Irish Water said that this figure included packs sent back blank or with messages of opposition to the charges, as these were treated as verification of an address and registered to their system as a result.
Charging for water formally began on 1 January, having been pushed back as part of a range of Government measures designed to appease opposition to their introduction.
The first bills are due to be issued from April.
Irish Water has encouraged households to return their application packs by 2 February in order to qualify for the water conservation grant, which was another measure announced by the Government late last year.
