If your sink makes noise while draining, the cause is usually trapped air, partial blockage, or venting imbalance rather than a faulty tap. Drain noises often occur when airflow cannot equalise properly. In most cases, the issue is related to the drain system rather than the water supply.
The Most Common Reasons
1. Partial Blockage
Restricted flow causes air to escape in bursts.
2. Vent Pipe Issue
Blocked roof vents can force air through the drain.
If toilets also make noise:
3. Shared Drain Line Discharge
Large water discharge from washing machines can affect nearby sinks.
Is This Serious?
Minor if:
- Noise is occasional
- Only one fixture is affected
More serious if:
- Multiple fixtures make noise
- Water backs up
What You Can Do
- Check for slow drainage
- Monitor other fixtures
- Avoid simultaneous heavy water use
For related issues:
→ Sink & Drain Problems Explained
→ Plumbing Problems Explained