Sink Faucet Repair: Fix Leaks & Drips (Troubleshooting Guide)

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Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

To fix a leaky sink faucet, turn off the water supply, disassemble the faucet, replace worn washers or O-rings, and reassemble. Use a wrench and plumber's tape for a secure fit.

Confirm the symptom

Water dripping from the spout
Low water pressure
Faucet handle feels loose
Water leaks around the base
Strange noises when water is running

Tools and prep

Adjustable wrench
Screwdrivers (flathead and Phillips)
Plumber's tape
Replacement washers and O-rings
Bucket or towel to catch water
Turn off water supply before starting

Step-by-step troubleshooting

Turn Off Water Supply
Do: Locate and turn off the shut-off valves under the sink.
Observe: Water stops flowing from the faucet.
Means: Water supply is safely off.
Next: Disassemble the faucet
Disassemble the Faucet
Do: Use a wrench and screwdrivers to remove the handle and cartridge.
Observe: Internal components are exposed.
Means: Access to faulty parts is gained.
Next: Inspect components
Inspect Components
Do: Check for worn washers, O-rings, or a damaged cartridge.
Observe: Visible signs of wear or damage.
Means: Identify the faulty part.
Next: Replace faulty parts
Replace Faulty Parts
Do: Install new washers, O-rings, or a new cartridge as needed.
Observe: Parts fit snugly and securely.
Means: Leak source is addressed.
Next: Reassemble the faucet
Reassemble the Faucet
Do: Put the faucet back together, tightening all connections with a wrench.
Observe: Faucet is fully reassembled.
Means: Ready for testing.
Next: Test the repair
Test the Repair
Do: Turn the water supply back on and check for leaks.
Observe: No dripping or leaks.
Means: Repair is successful.
Next: Done

Common causes

Cause	Likelihood	Difficulty	Part often needed
Worn Washer The rubber washer inside the faucet can wear out over time, causing leaks.	Common	Easy	Washer
Faulty O-Ring A damaged or aged O-ring can lead to water leakage around the base of the faucet.	Common	Easy	O-Ring
Damaged Cartridge A worn or corroded cartridge can cause leaks and reduced water pressure.	Sometimes	Medium	Cartridge
Loose Handle A loose handle can cause the faucet to not shut off properly, leading to leaks.	Sometimes	Easy	Handle Screws
Clogged Aerator Mineral buildup in the aerator can reduce water flow and pressure.	Sometimes	Easy	Aerator
Corroded Valve Seat Corrosion on the valve seat can prevent a tight seal, causing dripping.	Rare	Hard	Valve Seat
Worn-Out Gasket A deteriorated gasket can allow water to leak around the faucet base.	Rare	Easy	Gasket

Parts matching

Match your sink faucet issue to the right part for an effective repair.

Replace washers for dripping spouts
Install new O-rings for base leaks
Use a new cartridge for pressure issues
Tighten handle screws for loose handles
Clean or replace aerator for low flow
Replace gasket for base seepage
Resurface or replace valve seat for persistent drips

Purchase a faucet repair kit for common parts like washers and O-rings to cover multiple potential issues.

When to call a professional

Leak persists after replacing all common parts
Faucet is old and requires full replacement
Water pressure issues extend beyond the faucet
You notice water damage or mold growth
You're unsure about the correct parts or installation process

FAQ

How do I know if my faucet needs a new cartridge?

If your faucet has low water pressure or leaks even when turned off, a faulty cartridge is likely the cause. Disassemble the faucet to inspect the cartridge for wear or corrosion.

Can I fix a leaky faucet without turning off the water?

No, it's essential to turn off the water supply before starting any repairs to prevent water damage and ensure safety.

What tools do I need to repair a sink faucet?

You'll typically need an adjustable wrench, screwdrivers, replacement washers or O-rings, plumber's tape, and a bucket or towel to catch any residual water.

Why is my faucet making a humming noise?

A humming noise is often caused by high water pressure or a partially closed shut-off valve. Check your home's water pressure and ensure the valves are fully open.

How often should I replace faucet parts?

Washers and O-rings should be inspected annually and replaced as needed. Cartridges and other components may last several years but should be checked if leaks occur.