A toilet leak can occur in various places. It could be a leaky flange, a leaky water supply line or the toilet itself to name a few. In order to fix the leak, you must first identify where the leak is coming from. The source of the leak will determine how you repair it. Sometimes it's a quick fix, and other times it's a little more involved. If you have trouble identifying the source of the leak or you're not sure how to fix it, contact your local plumber. A professional plumber will ensure your toilet is fixed properly the first time.