a water leak, like a higher meter reading than usual, you should call in a professional to inspect your home both inside and out. by knowing the history of the home, you can also determine whether water may be an issue. it can get in the walls and under the floors making it very difficult to find. a professional will be able to use their tools to determine if there is a leak or not.
if you do suffer water damage, contact a cleanup professional in your area. 