Check water meter for leaks. Make sure no toilets, taps or geyser overflows are running then check your water meter on the pavement. If it is moving the chances are you have an under ground leak and you may be losing large quantities of water a day.
Always familiarise yourself with where the main shut-off valve is in case of an emergency. It is also a regulatory requirement to have a shut-off tap inside your property as we are not allowed to tamper with the Council valve or Meter on the pavement.