I've recently gone a water meter,I had some good advice on here,phone your water company tell them are a window cleaner and you use water to fill your tank but you don't return water to the sewer which you won't if you are di,if you are ro let the waster water go on your garden,which is fine as you are not returning it to the drains,then tell them you are fitting a sub meter to your supply which is possibly an outside tap like me,if that's the case ,in my situation water coming in is lets say £1 a cubic meter,water going down the drain is £2 a cubic meter,total cost £3 a cubic meter,no water down the drain £1 a cubic meter saving £2 a cubic meter,if you water bill for a year is £1500 at them moment you will only pay £500.
Forgot to say they will send you a letter for non return to sewer which is where I'm at now.
You will then have to phone them when you get your metered water bill with you sub meter reading they will then adjust you water bill accordingly.
A sub meter is only £40 if I can be of Any help my mob 07850332219