Irish Water is now using text messages to contact customers who haven't paid their bills.
It comes over a week since the utility confirmed it was getting in touch with some of those registered on their system by phone.
The company says depending on the contact information they have, some people 'will get a phone call, some will get a text and some will get a letter reminding them that their account is overdue'.
Meanwhile, the Environment Minister Alan Kelly says those who claim the water conservation grant and do not pay their bills will pay "penalties and penalties and penalties".
The Department of the Environment said last week that there were no plans to change the water conservation grant with Irish Water.
It followed reports that the government was considering restricting the €100 water conservation grant to those who actually pay their bills.
Transport Minister Paschal Donohoe told Newstalk last week that while all measures at Irish Water are being kept under review, there will be no change to the structures already in place this year.
