it was the ratable value off the property around 20 years ago and or the size off the supply pipe
they may also claim a deduction if surface water drains into a soakaway or they have a septic tank
if you have fewer people than bedrooms try a water meter
have you asked your water company??
if they cant fit a meter on your side off the supply[internal ]that is scanner read from outside
i am fairly sure they have to give you an average usually lower meter supply equivalent
in other words you don't get a water meter but a bill based on the lower average for your sort off property with meters
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