By PlumberDallas.com editorialUpdated
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Common causes

Worn or warped flapper

Water leaks from the tank into the bowl, so the tank keeps refilling.

Fill valve set too high

Water flows into the overflow tube.

Chain too short or tangled

Holds the flapper open.

What you can check yourself

  • Add food coloring to the tank; if color appears in the bowl without flushing, the flapper leaks.
  • Adjust the float so water stops below the overflow tube.
  • Replace the flapper (turn off the supply first).

When to call a plumber

Call if parts replacement does not fix it or the valves are corroded.

How a plumber diagnoses it

A plumber replaces the flapper and fill valve and checks the supply valve.

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