A water meter can be defective. A water meter has an internal disc or paddles that move when water passes through them. Water then moves the wheels or the register to record the water that passes through it. When the disc or paddles wear down, due to environment or from a defect inside of the meter, it will not register correctly. Since we use meters that record only the water that passes through them, the defect will actually cause a lower water bill. A water meter will never record usage unless water passes through it. A meter can never run fast.