The easiest way to find out if there is a leak somewhere in your home is to check your water meter. The new meters have a leak indicator on the dial face. This indicator resembles a small triangular propeller. If it is turning, even very slowly, and no water is being drawn, the meter is recording usage and you should investigate immediately. Toilets are notorious for running silently, sticking, starting and stopping and are a leading cause of residential leaks. To determine if you have a toilet leak; place a small amount of food coloring in the tank and let it sit for about 1/2 hour without flushing. If the coloring comes into the bowl, you have a leak in your toilet.