Check that this guide fits your situation.
Use this guide when
A small visible leak where the cabinet and shutoff valves can be reached from a dry, safe area.
Do not use it for
Water near electrical equipment, a ceiling leak, a burst pipe or a valve that will not operate gently.
Stop and get help if
- Water touches an outlet, appliance cord or electrical equipment.
- A valve is stuck, leaks when turned or the water does not stop.
- The cabinet or floor is extensively wet or damaged.
Supplies
- Towels
- Bucket or shallow pan
- Phone camera
Take it one step at a time.
- 01
Check for electrical danger
Do not touch wet electrical devices or enter standing water near electricity. Leave the area and seek appropriate help if there is a hazard.
Why this mattersElectrical safety comes before leak tracing. - 02
Protect the cabinet
Remove loose items if you can do so safely. Put a pan beneath the drip and towels at the cabinet edge.
Why this mattersContainment can limit immediate damage while the source is addressed. - 03
Close the relevant supply stop
If the leak is from a supply connection and the small stop valve is accessible, turn it gently clockwise. If you cannot identify or operate it, use the home’s main shutoff only if you know it and it is safe; otherwise call.
Why this mattersStopping water is the most useful first action for an active supply leak. - 04
Confirm whether water stopped
Watch from a dry position. If the leak continues, stop troubleshooting and call for plumbing service.
Why this mattersA closed fixture valve may not isolate every leak, especially a drain leak. - 05
Document the location
Photograph the visible drip and note whether it occurs with the faucet off, while water runs or only as the sink drains.
Why this mattersThe timing helps distinguish supply piping from drain connections. - 06
Arrange the repair
Leave a bucket in place only as temporary containment, avoid using the affected fixture and discuss any wet cabinetry or flooring when you call.
Why this mattersThe pipe and affected materials may need separate attention.
Yes → turn gently, confirm flow stops and document the leak.
No, or water is near electricity → leave the area and call for help.
Check the result.
If it improved
Keep the affected fixture off until the leak is repaired; dry accessible clean-water surfaces promptly.
If it did not
Call a plumber and report whether water continues with the supply shut off.
Source guidance
These public resources informed the safety boundaries and general steps. The exact equipment and conditions at your property may differ.