The single most common cause of a constantly running toilet is a warped, degraded, or misaligned rubber flapper valve located at the bottom of the toilet tank. Over years of exposure to water treatment chemicals and mineral buildup, the rubber flapper loses its flexibility and fails to seal the flush valve opening securely. This allows water to slowly and continuously seep from the tank into the bowl, prompting the fill valve to run constantly to maintain the correct water level. Verification: Add a few drops of food coloring to the tank without flushing; if colored water seeps into the bowl within 15 minutes, the flapper is leaking.
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