If you have not been irrigating, or knowing have not been using water more than normal, you may have a leak. Toilets are the most common culprit, often with leaks you cannot see or hear. To check your toilet, put some food coloring in the tank of the toilet and wait about 20 minutes. If the water in the bowl changes color, then the toilet is leaking - mostly likely the flapper isn't sealing.
You can also read your meter. You may have to shine a flashlight on it to "wake it up." There is a little red dial or triangle - if you are not using any water anywhere the dial should not be moving. If the dial is moving, then water is being used somewhere as water is going through the meter. You can take periodic readings from the meter to determine if or when the meter is showing usage to aid you in finding the extra usage.
Feel free to contact our customer service representatives at 515-963-3565, Monday through Friday, 8 a.m. to 5 p.m. for further questions or assistance.