If you have a higher-than-normal water bill, you may have a leak. To check for leaks on the customer side:
1. Make sure all water is shut off in the house
2. Go to the meter box and look at the meter. Meters will have some type of dial or indicator to show if water is flowing through the meter. If your meter is a digital meter, the meter will say "FLOW", indicating a possible leak. If your meter is not digital and has an indicator such as a triangle or a hand, the indicator will be continuously moving, indicating a possible leak.