To fix a water leak underneath your sink, start by placing a bucket beneath the plumbing trap to catch wastewater. Inspect all connections to determine the exact source of the moisture. If the leak comes from a slip-joint nut on the P-trap, hand-tighten the fitting or replace the internal rubber washer. If the leak originates from the sink strainer flange, unbolt the drain basket, clean away old plumber's putty, and apply fresh putty or silicone before reassembling and tightening the locking nut firmly. Verification: Run the faucet at full pressure to ensure all under-sink connections remain completely dry.
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