The single most common cause of toilet leaks is a degraded, warped, or leaking rubber flapper valve inside the tank that allows water to continuously seep into the bowl. The second most common cause of exterior leaks is a failed or compressed wax ring seal at the base of the toilet caused by loose floor closet bolts allowing the porcelain bowl to rock and break the watertight connection. Verification: Add food coloring to the tank to check for internal leaks, and observe the base during flushing to check for exterior leaks.
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