A toilet that refills even when no one has flushed may be losing water from the tank to the bowl through a worn flapper, seal or overflow arrangement. To check for a silent leak, put a few drops of food coloring in the tank and wait without flushing; color appearing in the bowl suggests water is leaking past a seal. Fix the source to prevent wasted water.
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For more context about this type of plumbing issue, read our related Oklahoma City guide.
Read the related VIP plumbing guide