How to Stop Your Toilet From Leaking Around the Base
What does it mean when your toilet is leaking from the bottom?
Top 3 reasons for a toilet to keep running
One of the most common causes for a running toilet is water leaking into the bowl via the overflow tube. This will happen when you have too much water in the tank.
One cause for a running toilet is that the refill tube continuously pumps water into the bowl. This happens when the tube is too long. It isn't positioned correctly in the overflow tube.
The most common cause of running toilets is an old flapper that needs to be replaced. When flappers get old, the seal is bad and causes water to leak to the toilet.