A sink that continues to leak even when the faucet is completely turned off indicates that the leak stems from residual water draining slowly through a loose or unsealed connection, a failing sink basket strainer gasket, or a weeping pressurized supply line. When water remains trapped in the P-trap or tailpiece, it will steadily seep out through any compromised slip-joint washer or cracked pipe joint, creating puddles even hours after the faucet was last used. Verification: Wipe all under-sink pipes completely dry and wrap toilet paper around joints to trace the exact source of moisture.
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