If your toilet is leaking, there are several possible reasons that may be causing this. If you have a traditional ball cock assembly toilet, here are a few symptoms that you may be experiencing that will help you to narrow down the root of the problem.
If water is draining from the tank into the bowl when not in use or the water level in the bowl is higher than normal, the issue is likely your flush valve. Another symptom of flush valve problems is ghost flushing, which means the water level in your toilet spontaneously reduces and then fills up again without pressing the toilet handle.
Once you have determined if it is your fill valve or your flush valve that needs attention, you can then further determine which part needs attention.
If your float is submerged, there is water inside the float, or the float is cracked, you will need to replace the float and float rod. If the float rod alone is severely corroded, broken or there are threads missing, you will also need to replace the float and float rod. Click here to find out how.
If the above actions do not help, you should replace your fill valve altogether.
If you are experiencing ghost flushing, this generally means that your flapper is leaking. And for those who don't believe in ghosts, try living with this problem without becoming a believer. But it's easy to fix. Click here to find out how to replace your flapper.
If your overflow tube is cracked, the flapper sealing surface is damaged or water is leaking from the underside of the tank in the vicinity of the flush valve shank, you will need to replace your flush valve. Click here to find out how.