If water is leaking under your sink, the cause is usually a loose pipe connection, worn washer, or cracked fitting rather than a burst pipe. Most under-sink leaks occur at joints or seals. In many cases, the problem is confined to the cabinet area rather than the wider plumbing system.
The Most Common Reasons
1. Loose Drain Fittings
Connections may loosen over time.
2. Worn Washer or Seal
Rubber washers degrade and allow drips.
3. Cracked Trap or Pipe
Plastic pipes can develop hairline cracks.
4. Supply Line Leak
Flexible supply hoses may leak at fittings.
If taps also drip:
Is This Serious?
Minor if:
- Leak is slow
- Only one joint is wet
More serious if:
- Cabinet wood swells
- Leak continues when taps are off
What You Can Do
- Dry area and identify source
- Tighten fittings carefully
- Monitor after use
For related issues:
→ Sink & Drain Problems Explained
→ Plumbing Problems Explained