Why does my toilet keep running?

A running toilet is typically caused by a faulty flapper, chain adjustment issue, or water level problem in the tank. Most of these are simple fixes you can handle yourself with basic tools.

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 past the flapper, the fill valve keeps running to maintain water level. Remove the toilet tank lid and check if the flapper is sitting flat - if it's warped or has buildup around the edges, replacing it usually costs under $10.

Chain length 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, the flapper can't close completely. The chain should have just enough slack to allow the flapper to seal but not so much that it gets caught under the flapper.

Water level issues can also cause continuous running. The water level should sit about 1 inch below the rim of the overflow tube. If it's too high, water spills into the overflow tube and the toilet runs constantly. This usually indicates a problem with the fill valve or float mechanism. In Ottawa's hard water areas, mineral buildup on these components is common and may require cleaning or replacement.

When to call a professional: If adjusting the chain, replacing the flapper, and checking water levels doesn't solve the problem, you may have a worn fill valve, cracked flush valve seat, or other internal damage requiring replacement parts and plumbing knowledge.

For persistent toilet issues or if you're planning a bathroom upgrade with a new comfort-height toilet, Ottawa Bathrooms can help with professional installation and ensure everything meets Ontario plumbing code requirements.

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