A one-time clog is annoying. A pattern is a message. Here’s how to read what your drains are telling you.
One slow drain
A single sluggish sink or tub is almost always a local clog — hair, grease, or gunk in that fixture’s trap or branch line. Usually a DIY-able fix.
Several drains at once
When the lowest drains in the house gurgle or back up together — especially when you run the washer or flush — the problem is downstream in the main, not any one fixture.
Backups that return on a schedule
- Every spring? Think root intrusion
- After heavy rain? Possible groundwater infiltration or a sag
- Getting more frequent? The line is telling you it’s failing
When to call a pro
Recurring whole-house backups are never “just a clog.” A camera inspection turns guesswork into a clear answer — and usually a cheaper fix the earlier you catch it.
Often Missed
One slow drain is local; several backing up at once means the main line — that distinction keeps you from paying to snake the wrong thing.