Approximately 50,000 households are waking up to a fourth day without water in the north east of the country.
Irish Water says three attempts to fix a ruptured water main that supplies the Staleen Water Treatment Plant in Drogheda have now failed.
The company has warned it will now have to build another "bespoke" solution "from scratch."
A temporary rotating rationing system had been in place – however the supply has now been completely shut off in the area to prioritise Our Lady of Lourdes Hospital in Drogheda.
Residents are being provided with water at 21 temporary water stations across Meath and Louth - however that supply must be boiled before use.
Local councillor Kevin Callan said hotels have been hit especially hard: