How Do I Fix a Leaky Pipe Under the Sink?

 A leaky pipe under the sink is a common household issue that can cause water damage if not addressed quickly. Here’s how to fix it:

1. Identify the Source of the Leak

Leaks under the sink often occur at pipe joints, P-traps, or due to cracks in the pipe. Dry the area and watch closely to pinpoint the source.

2. Turn Off the Water Supply

Locate the shut-off valve under the sink and turn it clockwise to stop the water flow. Open the faucet to drain any remaining water.

3. Tighten Loose Connections

If the leak is coming from a joint, use a wrench or pliers to tighten the fittings. Be careful not to overtighten, as this can damage the threads.

4. Replace Worn-Out Washers or Seals

Disassemble the leaking joint, inspect the washer or gasket, and replace it if it’s worn out or damaged.

5. Patch Small Cracks or Holes

For minor cracks, clean the area and apply plumber’s tape or a pipe repair kit. Epoxy putty is another effective solution for sealing small leaks.

6. Replace Damaged Pipes or P-Traps

If the pipe or P-trap is severely cracked or corroded, replace it entirely. Measure the pipe to ensure the replacement part fits correctly.

7. Test the Repair

Turn the water supply back on and check for leaks. Tighten connections or reapply seals if needed.

For step-by-step visuals and more repair tips, visit Plumbing FAQs.

Why Is My Pipe Leaking at the Joint?

Leaks at pipe joints are a common issue caused by several factors. Here’s what might be causing it:

1. Loose Connections

Over time, fittings at pipe joints can loosen due to vibrations, temperature changes, or improper installation.

2. Worn-Out Seals or Teflon Tape

Threaded pipe joints often rely on Teflon tape or pipe joint compound to seal. If these materials wear out, leaks can develop.

3. Corrosion

Older pipes, especially metal ones, can corrode at the joints, weakening the connection and causing leaks.

4. High Water Pressure

Excessive water pressure can stress pipe joints, leading to leaks over time.

5. Improper Installation

If the joint wasn’t properly tightened or aligned during installation, it might start leaking.

How to Fix a Leaking Joint

  • Turn off the water supply and disassemble the joint.
  • Clean the threads and reapply Teflon tape or joint compound.
  • Replace the gasket or washer if needed.
  • Reassemble and tighten the joint securely.

For more guidance on fixing leaking joints, visit Plumbing FAQs.

Location: Abbotsford, BC, Canada

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