Some leaks are obvious, a dripping faucet, a toilet running (where you have to “jiggle” the handle), but others are more hidden. The easiest way to check is to read your water meter, wait an hour or two (be sure no one in the house uses water) and read the meter again, if the reading has changed there is a leak. To check for a “silent” leak in a toilet, put a few drops of food coloring into the tank, do not flush, wait 30 minutes, check the bowl, if any of the color has seeped into the bowl there is a problem with the seal and you should contact your plumber. Remember your water meter will move with any water usage and even small leaks can add up on your bill.