Kitchen sink blocked or draining slowly?
A slow sink can be caused by food, grease, or a restriction farther along the waste pipe. If other sinks are slow too, the issue may be beyond this fixture. Start with simple, low-risk checks and avoid mixing drain chemicals.
Common clues
- Food or grease near the plug
Residue can collect in the basket or waste opening and gradually restrict flow. Remove only visible debris you can reach safely.
- Trap or waste-pipe restriction
A blockage farther down may cause gurgling, slow drainage, or water returning. Accessing a trap can release dirty water and should be done only if you know the fitting.
- Wider household drain issue
If several fixtures drain slowly or water backs up elsewhere, the problem may be in a shared pipe and require a plumber or drainage specialist.
Useful checks before calling
- 1Stop adding water
If the basin is close to overflowing, stop using it and remove standing water with a container if safe.
- 2Clear visible debris
Remove the plug basket and clear food or hair from the visible opening while wearing gloves. Do not push debris farther down.
- 3Use a simple manual method
A sink plunger may help if the overflow is covered and there are no chemical drain products in the water. Follow the tool instructions and stop if pipes leak.
- 4Check other fixtures
Note whether nearby sinks, baths, or toilets are also slow. Multiple affected fixtures suggest the blockage may be beyond the kitchen sink.
Do not mix drain cleaners, bleach, or other chemicals. If chemicals are already present, avoid plunging or opening the trap and follow the product safety label.
When to contact a repairer
Call a plumber if the sink remains blocked, water returns from another drain, pipes leak, or multiple fixtures are affected. A drainage professional may be needed for a shared-pipe blockage.
Useful details to have ready
- How quickly water drains and whether it backs up
- Whether other fixtures are affected
- Any drain product already used and whether pipes are visibly leaking
Common questions
Should I pour boiling water or chemicals into the sink?
Avoid boiling water, which can damage some pipework, and never mix chemical products. Use the product label and plumbing guidance; call a plumber if the blockage persists.
How do I know if the blockage is in the main drain?
Slow drainage or backup at several fixtures can indicate a shared drain issue. Stop using affected fixtures and contact a plumber or drainage specialist.
Post the repair job for local workers to review.
Share the job details and postcode area to invite offers. You can still post if no matching repairers are listed, but a quote is not guaranteed.