Hidden water leaks, even minor ones, can become costly when left unfixed. Even if you do not see any leaks around your home, most of your plumbing system is hidden, and it is possible that you are paying for leaking water. Good thing it is easy to check for hidden leaks in your own home. First turn off all water use in the house and take a reading from your water meter. Wait one to two hours, then take another reading. If the reading has changed, then you have a hidden water leak. Call in a plumber to find the leak and fix it as soon as possible.