Bear in mind I’m in QLD but this is how it works in our strata:
10 lots with one common meter.
Each owner is billed direct by the water company 1/10 of total usage plus full service charge to each owner.
Each lot also has individual water meters and many years ago we asked to be billed based on our meters. Water inspector came round and informed us the water meters were not up to spec and need replacing with ones that were. Strata lost interest and nothing happened.