Bathroom Sink Drain Keeps Leaking

By | June 29, 2022

Bathroom Sink Drain Keeps Leaking: Essential Causes and Fixes

A leaking bathroom sink drain can be a frustrating and potentially costly problem. Water damage, mold, and mildew can all result from even a small leak if left unattended. Fortunately, most sink drain leaks are relatively easy to fix with a few simple tools and materials. In this article, we'll explore the most common causes of bathroom sink drain leaks and provide step-by-step instructions for fixing them.

Causes of Bathroom Sink Drain Leaks

There are several common culprits that can cause a bathroom sink drain to leak. Here are the most frequent ones:

  • Loose Drain Basket: The drain basket is the metal strainer that sits at the bottom of the sink and collects hair and other debris. If the drain basket is loose, water can leak around it.
  • Worn-Out Washers: Washers are rubber or plastic gaskets that create a watertight seal around the base of the faucet and the drain assembly. Over time, washers can wear out and become less effective at preventing leaks.
  • Damaged Drain Assembly: The drain assembly is the assembly of pipes and fittings that connects the sink to the drainpipe. If the drain assembly is damaged, it can allow water to leak out.
  • Clogged P-Trap: The P-trap is the U-shaped pipe that traps water to prevent sewer gases from escaping into the bathroom. If the P-trap is clogged, it can cause water to back up and leak out of the sink drain.
  • Cracked Sink: In rare cases, a leak may be caused by a crack in the sink itself.

Fixing Bathroom Sink Drain Leaks

Once you've identified the cause of the leak, you can begin to fix it. Here's how to fix the most common types of bathroom sink drain leaks:

Loose Drain Basket

  1. Remove the drain stopper.
  2. Unscrew the drain basket using a pair of pliers or an adjustable wrench.
  3. Inspect the washer at the base of the drain basket. If it's worn or damaged, replace it with a new one.
  4. Reinstall the drain basket and tighten it securely.

Worn-Out Washers

  1. Turn off the water supply to the sink.
  2. Remove the faucet handle.
  3. Use a wrench to loosen the packing nut.
  4. Remove the old washer and replace it with a new one.
  5. Reinstall the packing nut and faucet handle.
  6. Turn on the water supply and check for leaks.

Damaged Drain Assembly

  1. Turn off the water supply to the sink.
  2. Disconnect the drainpipe from the drain assembly.
  3. Remove the old drain assembly.
  4. Install a new drain assembly.
  5. Reconnect the drainpipe to the drain assembly.
  6. Turn on the water supply and check for leaks.

Clogged P-Trap

  1. Place a bucket under the P-trap.
  2. Unscrew the slip nuts that connect the P-trap to the sink and drainpipe.
  3. Remove the P-trap and clean out any clogs.
  4. Reinstall the P-trap and tighten the slip nuts.
  5. Turn on the water supply and check for leaks.

Cracked Sink

  1. Unfortunately, there is no easy way to fix a cracked sink.
  2. You will need to replace the sink with a new one.

By following these steps, you can fix most bathroom sink drain leaks quickly and easily. If you're not comfortable working on plumbing fixtures, you can always call a plumber for help.


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