Water pooling underneath your sink is typically caused by one of three common failures: loose slip-joint nuts on the P-trap assembly, a degraded rubber washer inside a drain connection, or a failing sink strainer flange seal. Over time, daily thermal expansion and contraction cause plastic fittings to loosen, while rubber gaskets harden and crack, allowing water to escape whenever the sink is used or drained. Verification: Wipe all pipes completely dry and inspect each joint while running water to identify the exact point of failure.
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