Symptoms
- Gurgling noise as water goes down
- Sound seems to come from the drain or a nearby fixture
- Water may drain slower than normal along with the noise
- Gurgling worse when another fixture (toilet, washer) is used at the same time
Likely causes
- CommonPartial clog in the drain or trap creating air pocketsAs water squeezes past a partial blockage, trapped air bubbles back up and gurgles.
- CommonBlocked or undersized plumbing ventVents let air into the drain system; when blocked, water draining elsewhere pulls air through your trap instead.
- PossibleClog further down a shared branch lineEspecially likely if multiple fixtures gurgle together.
- Less commonLow water level in the trapA dry or low trap can let sewer gas and air bubble oddly.
What to do
- Try clearing the sink's own drain first, since a nearby partial clog is the most common and easiest fix, using a plunger and a hand-crank snake.
- Note when the gurgling happens, especially if it coincides with another fixture draining, which points toward a shared line or vent issue.
- Check if a roof vent pipe is visible and free of obvious blockages like leaves or a bird's nest, if safely accessible.
- If gurgling continues after clearing the local drain, it likely points to a vent or a clog further down the branch or main line.
- Run water in the sink alone versus with other fixtures to help narrow down whether it's local or system-wide.
- If multiple drains gurgle together, especially the lowest fixture in the house, treat this as a bigger clog or vent issue needing professional attention.
Tools and parts
- Plunger
- Hand-crank drain snake
When to call a pro
Call a plumber if gurgling continues after clearing the local drain, especially if multiple fixtures gurgle together, since it likely points to a vent or main line issue.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.