Your water bill can be adversely affected by an unstopped toilet bowl leak, not to mention the potential damage to floors or walls when they are constantly exposed to water, however small the amount.
Don’t flush your money down the drain by allowing a leak to go unchecked. Here is a simple test to see if your toilet bowl is the culprit. Remove the lid from the tank and squeeze in a few drops of liquid food color. (For psychological reasons, we recommend blue) Give it 30 minutes or so to work its way through. If when you return there is color in the toilet bowl you have found your leak.