Read your water meter before and after a two hour period when no water is being used. If the meter does not read exactly the same, there is a leak. Meet your meter Your water meter is the best detective in the home. It can tell whether you have a sizable leak as well as how much water various appliances are using. All you need to do is learn the language.
Most meters record just the gallons of water used.
Some show cubic feet of water used. In this case, multiply the amount of water in cubic feet by 7.5 to obtain a gallon value. The cubic feet meter indicates that 41,873 cubic feet of water have been delivered to the homeowner or approximately 314,047 gallons of water. To determine how much water you have used in a given period of time, simply subtract the number on your last bill from the current water reading. Note that these meters are never reset.