Reviewed by AJ Robles Owner & Licensed Master Plumber · LIC# RMP 46529 Plunging the same drain every few weeks is a sign the real problem hasn't been fixed — only pushed down the line. Recurring clogs almost always have a root cause, and once you know whether it's local or in the main sewer line, the fix becomes obvious. Here's how to read the symptoms.
One drain or several?
Start by noticing how many fixtures are affected. A single slow drain — one bathroom sink, one shower — is usually a local clog: hair, soap scum, or grease caught in the trap or branch line. Several fixtures backing up at once, especially the lowest ones like a tub or floor drain, points to the main sewer line that carries everything out to the city main.
The usual repeat offenders
- Grease and fat — they cool, harden, and coat the pipe walls until the opening shrinks to nothing.
- "Flushable" wipes — they don't break down like toilet paper and snag on everything downstream.
- Tree roots — drawn to moisture, they work in through joints in the sewer lateral and catch debris.
- Hard-water scale — mineral buildup narrows pipes over time.
- A bellied or broken line — a low spot or crack collects waste and clogs again and again.
Why snaking alone doesn't last
A drain snake punches a hole through a clog so water flows again — but it leaves the grease, scale, or roots coating the pipe. That's why the drain clogs back up soon after. For a one-off blockage a snake is perfect; for a recurring one, it's only a temporary fix.
Finding the real cause
The honest way to stop repeat clogs is to look inside the pipe with a sewer camera. It shows exactly what's happening and where — grease, roots, scale, or a damaged section — so we fix the actual problem instead of guessing. Depending on what we find, the answer may be a targeted cleaning, cable work, or a repair if the line is cracked or root-invaded.
When it's an emergency
If sewage is backing up into tubs or floor drains, stop running water and treat it as urgent — that's a main-line blockage that needs clearing before it overflows. Our drain & sewer team answers 7 days a week, and if you're mid-backup right now, see our emergency checklist first.