It can be frustrating to hear a constant drip from your tap. In many cases, the cause isn’t serious. A dripping tap is usually caused by a worn washer, damaged cartridge, or mineral buildup rather than major plumbing failure.
While it can waste water over time, the issue is often fixable.
The Most Common Reasons This Happens
1. Worn Washer
In traditional compression taps, a small rubber washer controls water flow. Over time, it can wear out or harden, preventing a tight seal.
This is one of the most common causes of dripping.
2. Faulty Cartridge
Modern mixer taps use cartridges instead of washers. If the cartridge becomes worn or cracked, water may continue to flow slightly even when turned off.
Replacing the cartridge often solves the problem.
3. Mineral Buildup
Hard water deposits can prevent internal components from sealing properly. This can lead to small but constant drips.
Cleaning internal parts may reduce buildup.
4. Loose or Worn O-Ring
Small rubber O-rings inside the tap body can degrade over time, allowing water to leak.
This is common in older fixtures.
5. High Water Pressure
Excessively high water pressure can stress tap components, increasing wear and causing leaks.
If you’ve noticed other plumbing noises, see Why Is My Toilet Running Constantly?
Is This Normal?
A tap should not drip continuously.
It may be minor if:
• The drip is slow and occasional
• The tap is older
• The issue developed gradually
It may not be normal if:
• The drip increases quickly
• Water pressure changes suddenly
• There are leaks under the sink
When Should You Worry?
You should investigate further if:
• Water leaks from the base of the tap
• The drip becomes steady
• You notice rising water bills
• The tap handle feels loose
Persistent dripping may require part replacement.
What You Can Do
If your tap is dripping, you can:
• Turn off the water supply
• Replace the washer or cartridge
• Clean internal components
• Check for mineral buildup
• Monitor for recurring leaks
If dripping continues after replacing parts, professional repair may be necessary.
In most situations, a dripping tap is caused by worn internal seals rather than serious plumbing failure. Replacing small components often resolves the issue. If leaks persist, a plumber can inspect the fixture.