Visible leak guide
Under-Sink Leak: Contain It and Find the Pattern
A bucket buys time; it does not identify whether the source is a supply valve, drain fitting, disposal, seal, or damaged component.
Check this drain problemWhat this pattern often looks like
- A drip appears only while the sink drains.
- A fitting or trap is visibly wet.
- The leak is small enough to contain without entering a damaged area.
Signs to stop and call
- Water is near an outlet, disposal connection, dishwasher, wall, or floor cavity.
- A supply line is spraying or flowing continuously.
- Cabinetry, flooring, or a ceiling below is swelling or stained.
Safe checks
- Place a bucket and towel under a small accessible drip only if the area is dry and safe.
- Stop using the fixture and photograph where moisture first appears from a dry location.
- If a visible supply line is leaking and its accessible shutoff turns easily, close it gently. Never force a stuck valve.
Do not do this
- Do not touch electrical equipment with wet hands or from a wet surface.
- Do not tighten unfamiliar plastic fittings until they crack.
What to tell the plumber
Water appears under my sink when [activity]. It seems to begin near [location], and there [is/is not] visible cabinet or floor damage.
Related visual tip
Contain the drip before chasing the fitting.
A bucket buys time and a clear photo helps identify whether water appears while the fixture fills, drains, or sits unused.
These are general observations, not a diagnosis. Active flooding, rising sewage, water near electricity, gas smell, or structural damage requires qualified local help.