A leak can cause higher usage. Seasonal usages such as lawn watering, filling pools, additional laundry, and washing automobiles can be the cause. To check for plumbing leaks, turn off all indoor and outdoor faucets and water operable appliances. Go to your meter and open the meter box lid. Write the meter reading down (from left to right) and mark where the sweep hand is on the face of the meter. Wait approximately 15 minutes without using water. Return to the meter box and check to see if the hand moved or if the reading has changed.