How to Unclog a Bathroom Sink: A Quick Guide for Tenants (and When to Call Your Property Manager)

Standing water in the bathroom sink is annoying, not an emergency — most of the time you can clear it yourself in a few minutes.

Try this first

1. Clear the stopper — lift/unscrew it and clear hair/soap-scum buildup by hand.
2. Boiling water — pour hot (not quite boiling, to protect older pipes) water down the drain in 2-3 stages.
3. Baking soda + vinegar — half a cup each, let fizz 10-15 min under a wet cloth, flush with hot water.
4. Plunge it — block the overflow hole with a wet rag, add a little water, plunge firmly 10-15 times.
5. Check the P-trap — bucket underneath, loosen slip nuts, clear it out, reassemble.
6. Drain snake — a cheap hand-crank snake reaches clogs a plunger can’t.

What NOT to do

Skip harsh chemical drain cleaners — they can damage older pipes and irritate skin/lungs in a small bathroom; in a rented unit, pipe damage from a chemical cleaner can become a liability question between tenant and landlord. (For other DIY jobs, like whether tenants can paint the walls, the same rule applies: check with your landlord or property manager before anything that could affect the unit.)

When to stop and call a professional

• The clog returns within days of clearing it.
• More than one fixture is draining slowly at the same time.
• A sewer-gas smell comes with the slow drain.

Any of these can mean a deeper building-plumbing issue — a job for a licensed plumber.

For tenants: who handles this?

A slow/clogged drain from normal use is typically the owner’s/management company’s maintenance responsibility, not something a tenant pays a plumber for out of pocket. If the steps above don’t work, submit a maintenance request rather than attempting bigger plumbing work.

For landlords and owners

A clogged sink is small — until it’s one of a dozen requests competing for your attention the same week. Green Ocean Property Management handles maintenance coordination for owners across Boston, Cambridge, Newton, Brookline, and the rest of Greater Boston.