Water between the tank and bowl of a two-piece toilet can come from a tank bolt seal or the larger gasket that carries water during a flush. A supply connection can also drip onto that seam. Identifying the first wet spot helps narrow the repair.
Compare an idle toilet with a normal flush
If the area is dry and there is no active leak, watch during normal use. Moisture that appears only during a flush is useful to report. A bolt seal can leak while the tank sits full. If water is actively escaping, stop using the toilet and isolate the fixture if you can safely operate its shutoff.
Give the plumber the model and a clear view
Photograph the connection and share the model number if visible. Avoid tightening the tank bolts to see whether the drip stops. Uneven pressure can damage porcelain. A plumber can check the seals and confirm the tank is stable after repair.
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