A leaking pipe under the sink is one of those problems that seems scary but is usually a simple fix. Most leaks come from loose connections or worn washers — not cracked pipes.
What Causes a Leak Under the Sink? The most common causes are a loose P-trap connection, a worn drain gasket, or a damaged supply line.
What You’ll Need A bucket, plumber’s tape, adjustable wrench, and a P-trap kit if needed.
Step 1: Find the Source Dry everything under the sink. Run the water and watch where the drip comes from.
Step 2: Tighten Loose Connections Hand-tighten the slip nuts on the P-trap. If that stops the leak you’re done.
Step 3: Replace Worn Washers Take apart the leaking connection and replace the rubber washer inside.
Step 4: Wrap with Plumber’s Tape Apply plumber’s tape to threaded connections before reassembling.
Step 5: Replace the P-trap If the P-trap is cracked, replace it. Costs around $8 and takes 10 minutes.