Why does my toilet keep running?

A running toilet is typically caused by a faulty flapper, chain, or fill valve that prevents the toilet from completing its flush cycle properly. This wastes water and can increase your utility bill significantly.

The most common culprit is the rubber flapper at the bottom of the tank not sealing properly against the flush valve seat. Over time, flappers warp, crack, or accumulate mineral buildup that prevents a tight seal. When water continuously leaks from the tank into the bowl, the fill valve keeps running to maintain the water level.

Chain problems 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. If it's too short or gets tangled, the flapper can't close completely. The chain should have just enough slack to allow the flapper to seat properly while still lifting it when you flush.

Fill valve issues can also cause continuous running. Older fill valves may stick in the open position, or the float mechanism might be set incorrectly. If the water level is set too high, it will continuously overflow into the overflow tube, triggering the fill valve to keep running.

In Ottawa's hard water areas, mineral buildup accelerates these problems. The high mineral content can cause flappers to deteriorate faster and create deposits that prevent proper sealing. Regular cleaning and maintenance can extend component life.

Simple fixes you can try include adjusting the chain length, cleaning around the flapper seat, or gently bending the float arm. However, if the flapper is warped or the fill valve is old, replacement parts are needed. Most toilet repair kits cost $20-40 and can resolve multiple issues at once.

If basic adjustments don't solve the problem, or if you're uncomfortable working inside the toilet tank, a licensed plumber can quickly diagnose and fix the issue. Running toilets waste hundreds of gallons monthly, so prompt repair saves money on your water bill.

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