Finding mysterious puddles under your sink without an obvious dripping pipe is frequently caused by condensation buildup, a loose sink rim seal, or minor splash-over from the countertop. When humid ambient air hits cold under-sink PVC pipes or supply lines, moisture beads up and drips down. Alternatively, water can seep down through unsealed gaps around the kitchen or bathroom sink flange whenever the basin is filled or wiped down. Verification: Wipe all pipes completely dry with a paper towel and wrap tissue around joints to pinpoint the exact source of moisture.
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