What is the most common cause of a running toilet leak?
The most common cause of a running toilet is a worn or misaligned flapper. A faulty fill valve or float can also keep water flowing. Technicians can replace these parts during service or install a new toilet if needed. Eco-friendly, rebate-eligible options are available when replacing.
Quick checks:
- Put a few drops of food coloring in the tank; color in the bowl without flushing means a leak.
- Check the flapper for wear or chain slack.
- Listen for hissing from the fill valve.
Updated: 2025-12-21
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Sources 12
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