How To Fix Leak Under Bathroom Sink

How to Fix a Leak Under a Bathroom Sink

A leaky bathroom sink can be a common problem that can lead to water damage and higher water bills. If you notice a leak, it's important to address it promptly to prevent further damage. Fortunately, fixing a leak under a bathroom sink is often a simple task that can be completed with basic tools and materials.

Tools and Materials You'll Need

Adjustable wrench
Pliers
Flathead screwdriver
Replacement parts (if necessary)
Plumber's putty
Teflon tape
Basin wrench (optional)

Step-by-Step Instructions

Step 1: Turn Off the Water Supply

Before you start working on the sink, it's important to turn off the water supply. Locate the shut-off valves under the sink and turn them clockwise to stop the flow of water.

Step 2: Remove the Drain Stopper

If your sink has a pop-up drain, you can skip this step. Otherwise, use a flathead screwdriver to remove the drain stopper. This will allow you to access the drain assembly beneath.

Step 3: Check the Drain Assembly

Inspect the drain assembly for any loose connections or damaged parts. If the leak is coming from the drain, you may need to replace the washer or gasket. Tighten any loose connections using an adjustable wrench.

Step 4: Check the Supply Lines

Examine the supply lines that connect to the sink faucets. Ensure that they are securely connected and not damaged. If a supply line is leaking, you may need to replace it.

Step 5: Check the Faucet Base

If the leak is coming from the base of the faucet, you may need to replace the O-rings or washers. Remove the aerator and use an adjustable wrench to loosen the faucet base. Replace the old O-rings or washers with new ones and tighten the base back into place.

Step 6: Check the P-Trap

The P-trap is the curved pipe that connects the drain to the wall. It can sometimes become loose or cracked, causing a leak. Use an adjustable wrench to tighten the connections or replace the P-trap if it's damaged.

Step 7: Reassemble and Test

Once you have identified and fixed the leak, reassemble the sink and turn on the water supply. Check for any leaks around the drain, supply lines, or faucet base. If the leak is still present, you may need to contact a professional plumber for assistance.

Tips for Preventing Leaks

Regularly inspect your sink and fixtures for any signs of leaks.
Tighten any loose connections or replace worn-out parts.
Use plumber's putty or Teflon tape to seal connections and prevent leaks.
Avoid using harsh chemicals or abrasive cleaners on your sink and fixtures.
Call a plumber if you are unable to fix the leak yourself or if the problem persists.