Sydneysiders have soaked up more water in one day than they have on any other day in more than a decade after enduring sweltering conditions.

Demand for water on Sunday topped the peak of the past 14 years at 2.215 billion litres with temperatures hovering around 35C in the city and 40C in the west. That’s about 8.8 billion glasses of water and the highest daily usage since January 29 in 2003 when there was…