Been in this house over 12 years, suddenly the water bills shot up. Checking the meter with everything turned off including the toilet inlets the meter is still running. If The inlet tap is turned off in the garden just before the pump the meter stops, so it's house side. Pump on or off makes no difference, except the pump comes on and at regular intervals, even though no water is being used. Called the water dept, not their problem and no help. Cant see any water leak evidence in house (2 story) so it might be the pipes under the concrete at the back, Is there way of locating a leak, without ripping the house apart?