Ailsa43
I can't have a water meter here, because it's not a suitable property for it to be fitted for some reason I"m not clear about, my husband knows more, but even with only 2 of use here we pay more than my AC who has a water meter
If you are not able to have a water meter fitted, for whatever reason, you can ask your water company to assess how much better off you would be if you could have one, and they can redo your bills based on that.
A friend was in this position, someone came out and agreed yes, not possible to have a meter as she was on a shared system with neighbour. She now pays about £200 a year less for her water, under the estimated bill..
This is in England, not sure if it applies elsewhere.