Delta Bathroom Faucet Leaking Underneath Sink

Delta Bathroom Faucet Leaking Underneath Sink: A Comprehensive Guide to Diagnosis and Repair

A leaking Delta bathroom faucet is not only annoying but can also lead to water damage and higher utility bills. If you find yourself dealing with this issue, don't panic. Diagnosing and repairing a leaking Delta faucet is relatively straightforward, and you can often do it yourself with the right tools and know-how.

Common Causes of Delta Faucet Leaks

Before you can fix a leak, you need to determine its cause. Here are some of the most common reasons why Delta faucets leak from underneath the sink:

Worn or damaged O-rings or seals
Loose or cracked cartridge
Faulty supply lines
Cracked or damaged faucet body

Tools and Materials You'll Need

To repair a leaking Delta faucet, you'll need the following tools and materials:

Adjustable wrench
Basin wrench
Pliers
Flashlight
Replacement O-rings or seals (if necessary)
Cartridge puller (if necessary)

Step-by-Step Repair Guide

Once you have gathered your tools and materials, follow these steps to repair your leaking Delta faucet:

1. Turn Off the Water Supply

Before starting any work, turn off the water supply to the faucet. You'll find the shut-off valves underneath the sink.

2. Remove the Aerator

Remove the aerator at the end of the faucet spout by unscrewing it. You may need to use pliers if it's stuck.

3. Check for Leaks Around the Aerator

Turn on the water supply slightly and check for leaks around the aerator. If you see water dripping, tighten the aerator using pliers.

4. Check the O-rings or Seals

If the leak is not coming from the aerator, check the O-rings or seals at the base of the faucet handle and spout. If they are worn or damaged, replace them.

5. Check the Cartridge

If replacing the O-rings or seals doesn't stop the leak, the cartridge may be faulty. You'll need to remove the handle to access the cartridge.

6. Inspect the Supply Lines

Check the supply lines that connect the faucet to the shut-off valves. If they are loose or cracked, tighten or replace them.

7. Check the Faucet Body

If you have checked all the above potential leak points and still have a leak, the faucet body may be cracked or damaged. In this case, it's time to call a plumber.