Why Does My Drain Keep Clogging?
If you keep clearing the same sink, shower, tub, or main line, the real problem may not be the clog you see — it may be buildup, roots, or a deeper sewer issue.
Quick Answer
A drain keeps clogging when the underlying cause is still inside the line. Common culprits include:
Grease, hair, soap scum & food waste building up on the pipe wall
Mineral scale narrowing older pipes
Tree roots entering the main line
Pipe damage or sagging that traps water and debris
Clearing vs. Cleaning a Drain
There is a big difference between the two. A plunger, small hand snake, or chemical product may punch a hole through a clog — water flows again, so it feels solved. But the buildup around the pipe wall is still there, catching more grease, hair, and debris until the clog returns.
Professional drain cleaning focuses on restoring flow and understanding why the clog happened. For recurring problems, rooter service or hydro jetting may be needed.
Root Causes
Common Causes of Recurring Clogs
Quick fixes only open a small path through a blockage — they don’t remove the cause.
Grease & Cooking Oil
Goes down warm and liquid, then cools and sticks to the pipe, collecting food particles until the line narrows. Wipe pans and trash the grease.
Hair & Soap Scum
Bathroom sinks, tubs, and showers clog as hair catches on buildup and forms a mat. Screens help, but deeper buildup may need cleaning.
Food Waste
Pasta, rice, coffee grounds, peels, and fibrous foods create stubborn kitchen clogs — especially in a line that already has grease.
Tree Roots
Roots seek moisture and enter through cracks or joints in the main line, then grow and catch debris. A common cause of recurring backups.
Mineral Scale
Minerals and scale narrow the inside of a pipe over time. The smaller the opening, the easier clogs form — older lines clog more often.
Pipe Damage or Sagging
A damaged, sagging, or poorly sloped line collects waste in the low area. A sewer camera inspection can confirm it.
What Different Symptoms Mean
One slow bathroom sink
Usually a local clog near that fixture.
Kitchen sink keeps backing up
Often points to grease buildup.
Tub or shower slows repeatedly
Typically hair and soap scum.
Several drains slow at once
May point to a main line problem.
When it’s more than one drain
If a toilet gurgles when the shower runs, or water backs up into a tub when the laundry drains, the issue is likely deeper in the system — time for a professional look.
When to Call
Signs It’s Time for Drain Cleaning
The same drain keeps clogging
Repeated clearing restores flow but not the cause.
Several drains are slow at once
Points toward a shared or main line.
Gurgling or bad smells
Air and odor struggling through a partial blockage.
Water backs up into tubs/showers
Wastewater has nowhere else to go.
Plunging only helps briefly
The blockage reforms around remaining buildup.
You suspect roots or a sewer issue
Needs a camera inspection to confirm.
Questions & Answers
Frequently Asked Questions
Why does my kitchen sink keep clogging?
Why does my shower drain keep clogging?
Are chemical drain cleaners a good idea?
What does it mean if several drains clog at once?
Is hydro jetting better than snaking?
When should I call a plumber?
Related Services & Guides
Recurring clogs often connect to drain, main-line, or sewer problems: