How to Fix a Running Toilet
Is your toilet constantly running? More times than not, your flapper or flush valve seal is the cause of your running toilet. As the flapper or seal slowly leaks, the water level in your tank drops, activating the fill valve. The most common and quickest fix for a running toilet is to replace your leaking flapper or flush valve seal.
If you do not have a leaky flapper or seal, and your toilet keeps running, your fill valve is probably the issue. If you have an old and outdated fill valve with an external float, the build-up can cause the float to stick, preventing it from shutting off. If you have a new fill valve, you might have installed it incorrectly.
Still Running After Replacing the Flapper?
If you recently installed a new flapper or seal and your toilet is still running, there might be an issue with the installation.
Confirm You Have the Right Flapper or Seal
If you have a flapper, make sure you have the right size your your flush valve. If you have a seal, most tower-style valves have a specific-fit replacement seal. If you aren't sure, read our guide about identifying your flush valve and selecting the right seal.
Check the Flapper Chain Length
If you have the correct size flapper, make sure the chain is not too tight or too loose. We recommend only leaving 1-2 chain links in slack so it doesn't get in the way or hold the flapper open when you flush the toilet.
Inspect the Flush Valve
Check the flush valve for any debris build-up or defects that could create a path for water to leak. If you find a crack or damage, you need to replace the flush valve.
