A drain that clogs once is a nuisance. A drain that clogs repeatedly — every few months, despite cleaning — is telling you something. Here are the most common reasons drains keep coming back, and what to do about each.
1. You’re Clearing the Clog, Not the Cause
Most chemical drain cleaners and basic snaking clear enough of the blockage to restore flow without removing the root cause. Grease coating pipe walls, partial root intrusion, and mineral scale keep reforming. Professional hydro-jetting removes the blockage completely and cleans the pipe walls — typically lasting 3–5x longer than snaking alone.
2. Tree Root Intrusion
Sonoma County’s abundant mature trees — oaks, redwoods, liquidambars — send roots toward any moisture source. Sewer and drain lines are prime targets. Roots enter through pipe joints and grow to fill the pipe, creating recurring blockages. The only fix is clearing roots and repairing or lining the pipe.
3. Pipe Sag (Belly)
Drain pipes should slope consistently downward. Over time, ground movement can cause sections to sag, creating low spots where water and debris pool instead of flowing out. Only a camera inspection reveals this, and the fix is usually pipe replacement.
4. Grease Buildup in Kitchen Drains
Every time cooking grease goes down the drain, it coats the pipe walls. Over time, this accumulates into a thick layer that catches food debris. The solution is stopping the practice (grease in the trash, not the drain) and hydro-jetting to clean existing buildup.
5. Aging Pipes
Cast iron drain pipes (common in pre-1970 Sonoma County homes) corrode internally, creating rough surfaces that catch debris. Galvanized steel pipes build up mineral scale that restricts diameter. If your home has original pipes and repeated clogs in multiple locations, it may be time for a camera inspection and possible repiping.
Related: Professional Drain Cleaning | Sewer Line Camera Inspection