Question about water bill?

Test for water running by turning off all consumption in your home. If the meter still moves after you have done so it means that you have a pipe leaking somewhere. The cost to redo the entire is expensive. What you can try to do is to have a qualified plumber lay new piping (above ground) leading to your tap off points, ie, water tanks and main taps. Main Taps are those which get water supply direct from the Mains. Secondary Taps get the water supply from the Water Tank. This should solve your problem. It is also possible that the meter is faulty and for this you have to get the relevant authority to come test and maybe change the meter as well.