If you think your water usage is high, water leak is a possibility.

How to detect a water leak?

• Make sure ALL faucets and fixtures are turned off and closed for the entire house, including irrigation.
• Go to your main water meter (usually near the front curb) and open the box (Don’t be startled because of insects, frogs. Take a quick look before sticking your hand in.)
• Check the meter itself to see if the dial is spinning at all. Sometimes it barely twitches depending on water pressure at the street.
• If the meter dial is not spinning, there are no leaks.
• If the meter is spinning and you are absolutely sure that all sources of water are turned off for the house, then you have a leak somewhere. Seek professional help

Reference : https://www.austintexas.gov/department/water-leaks

Bill Adjustments : If you have experienced a leak that resulted in a higher than average bill, submit a request for a water leak bill adjustment.