What is the most common cause of a running toilet leak?
The most common cause of a running toilet is a worn flapper that no longer seals the flush valve, letting water leak from tank to bowl. A misadjusted fill valve or a too-tight chain can also keep water flowing.
Quick checks:
- Do a dye test; color in the bowl points to the flapper.
- Leave slight slack in the chain.
- Set water to the tank’s fill line.
Endless Energy repairs and replaces toilets with same-day or next-day service in Weston and Cambridge.
Updated: 2025-12-22 00:00:00
Need help in Weston, MA? Call (508) 501-9990 or book online.
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