It doesn’t make sense in these cities to charge an old pensioner, who barely turns on a tap, the same for their water as a family who uses litres on their garden and washing their cars
A 25% reduction in water use transforms the way you look at the problem i.e. could we reduce the expenditure on the infrastructure? How much would we save in reduced energy costs for operating our water system? How could we better tune the water system to achieve further savings?