Why does my toilet keep running long after flushing?

A toilet that keeps running after flushing is typically caused by a faulty flapper valve, incorrect chain length, or a worn fill valve that isn't properly shutting off the water flow.

The most common culprit is the rubber flapper at the bottom of your toilet tank not sealing properly against the flush valve seat. Over time, this flapper can warp, develop mineral buildup, or simply deteriorate, preventing it from creating a watertight seal. When the flapper doesn't seal completely, water continuously leaks from the tank into the bowl, causing the fill valve to keep running to maintain the water level.

Chain length issues are another frequent cause. If the chain connecting the flush handle to the flapper is too long, the flapper won't lift fully during flushing and may not drop back into proper position. If it's too short, it can prevent the flapper from sealing completely. The chain should have just enough slack to allow the flapper to close fully while still lifting it completely when you flush.

Fill valve problems can also cause continuous running. Older fill valves (especially the ball-and-arm style common in Toronto homes built before 1990) can wear out and fail to shut off properly. The float mechanism may stick, or internal components may deteriorate, causing the valve to keep filling even when the tank is full.

In Toronto's hard water areas (particularly in North York, Scarborough, and parts of Etobicoke), mineral buildup accelerates wear on toilet components. The high mineral content in our water supply can cause flappers to become rigid and fill valves to stick more frequently than in softer water areas.

Professional vs. DIY considerations: This is typically a straightforward DIY repair that most homeowners can handle safely. Basic toilet repairs don't require permits in Toronto, and the components are readily available at local hardware stores. However, if you discover cracked porcelain, need to remove the toilet, or suspect issues with the water supply line, it's time to call a licensed plumber.

Next steps: Start by lifting the toilet tank lid and observing what happens when you flush. Check if the flapper is sealing properly, adjust the chain length if needed, and consider replacing the flapper if it's warped or has mineral buildup. If these simple fixes don't solve the problem, the fill valve likely needs replacement - a slightly more involved but still manageable DIY project for most Toronto homeowners.

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