How to describe a slow drain
Notice the pattern before you guess what's blocked. Tell the plumber which fixtures are slow, since when, and what's been tried.
The bathroom sink has drained slowly for three days. I haven't noticed the same problem at other fixtures. No drain cleaner has been used.
- Which fixture, and since whenThe sink, tub, toilet or floor drain, and how long.
- What else is affectedOne fixture, or more than one.
- What's been triedProducts or tools already used. Say so before work starts.
What to notice
Name the affected fixtures
Tell the plumber whether the problem involves one sink, a tub, a toilet, a floor drain, or more than one fixture. Describe only what you've already noticed.
Describe the pattern
These are observations to share, not a way to tell which pipe is at fault.
- Does water drain slowly, stay put, or come back up?
- Did it change suddenly or gradually?
- Have you noticed gurgling or an unusual smell?
- What products or tools have you already used?
Don't flush or run taps just to test a suspected backup.
Before you call
Wastewater coming back up is different
Seattle Public Utilities describes a sewer backup as wastewater coming up through a sink, toilet or drain. Its guidance: stop using water and avoid contact with sewage. Follow your own utility's instructions; Seattle's phone numbers and pipe rules apply only in Seattle.
Ask what the visit will establish
Ask what inspection is proposed, what it costs, and what would justify more work. Ask for the findings and a written scope before you agree to a larger repair.
Source
The sewer backup description comes from Seattle Public Utilities, and its local rules apply in Seattle only. The questions and the example are ours, to help you prepare; they aren't a diagnosis.
- Seattle Public Utilities: Side sewer backups, Sep 20, 2026