The hose between a toilet and its shutoff stays under pressure while the shutoff is open. A leak can leave a puddle near the base even when the drain seal is sound. The first point that gets wet helps identify the source.
Trace the moisture without disturbing the hose
If it is safe to approach, look at both ends of the hose and the underside of the tank. Note whether moisture appears when the toilet has been idle or only after flushing. Water can run down a fitting and drip far from the connection that leaked.
Report the condition of the shutoff
Tell the plumber if the shutoff is stuck, the hose shows visible corrosion, or the connection is hard to reach. If water is escaping and you can safely operate the shutoff, isolate the fixture. Avoid tightening or bending an old connector to see whether the leak stops.
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