Steve Andrews, head of operations control at South East Water, said the company really was “truly sorry for the disruption”.
He added: “I would ask all customers to use water for essential use over the next few days, just so we can get the system returned to normal.
“We’re seeing really high demand and that’s preventing the system recovering as it normally would do.”
Rosie Duffield, the independent MP for Canterbury, has written to the company.
She told BBC Radio Kent: “It beggars belief there’s no forward planning for instances like this, when we know we’re expecting more houses to be built, when we know climate change is real.”
Jane Bowyer from Cheesemakers of Canterbury has lost four days of production.
“This will result in perhaps a lack of cheese at Christmas” she said.