Toilet Keeps Clogging

Read the Pattern: Which Kind of Repeat Clog Do You Have?

Plunging fixes a clog. It does not explain one. When a toilet clogs again and again, ask three questions.

• Does only this toilet clog, and every time you use a lot of paper? That points to the toilet or to what is going into it.
• Does it clog on a schedule, like every few weeks, after you clear it? That points to a partial blockage or a rough spot in the pipe past the toilet.
• Are other drains slow or gurgling too? That points to the main line, the vent, or a septic system that is struggling.

Write down your answers before you call. They shorten the diagnosis a lot. If the toilet is backing up right now, start with toilet backing up, which covers the emergency steps. This page is about why it keeps happening.

Cause One: The Toilet Itself

A weak design or a worn-out flush

The federal limit is 1.6 gallons per flush, and WaterSense labeled toilets use 1.28 gallons or less. A well-made bowl does the job on that water. A poorly designed or very old one does not, and it will clog on a normal amount of paper. If a toilet has always clogged easily, even when you flush only a little at a time, the toilet is the problem. See how to choose a toilet.

Mineral buildup

On well water, minerals can coat the inside of the trap and the jet holes. The passage gets rougher and narrower over time, so paper catches. If you also have a weak flush, read weak flushing toilet.

Something stuck in the trap

A toy, a razor cap, or a wad of wipes can sit in the bend of the trap and let water pass around it. The toilet seems fine, then the next big flush catches on it. A plunger often cannot move it. If you hear a clunk or feel a hard stop with a closet auger, stop pushing so you do not scratch the porcelain, and call.

Cause Two: What Goes Down It

This is the cause people hope it is not, and it is the most common. Some items look like they flush and do not break down.

• Wipes labeled flushable. They go down the bowl, then snag in the pipe and gather everything behind them.
• Paper towels, tissues, and cotton swabs. They do not dissolve like toilet paper does.
• Dental floss. It wraps around other debris and makes a rope.
• Too much paper at once. This is common with kids and in a bathroom where a low-flow toilet has to move a lot.

If you are on septic, the list matters even more. Things that do not break down end up in the tank. The how septic systems work post and the what not to flush on septic post explain why. A simple change helps: a small trash can with a lid next to every toilet.

Cause Three: A Partial Blockage Past the Toilet

When the same toilet clogs again after a few weeks, the pipe often has a problem the plunger never reached.

• Buildup on the pipe wall. Grease and paper layer up and shrink the opening.
• Tree roots. They find hairline gaps in older pipe and grow into a net that catches paper.
• A dip in the line. A sagging section of pipe holds water, and solids settle there and pile up.

Ryan clears main sewer line blockages mechanically, with no chemical drain cleaners. That gets the pipe open again. It does not fix a sagging or broken section, and he will tell you honestly if what you have is a clog or a pipe that needs more than cleaning. If the main line is the suspect, signs your main sewer line is clogged lists what to look for, and the drain cleaning page explains the service.

If You Are on Septic or a Well Home

Many homes around here have septic systems. A toilet that keeps clogging, plus slow sinks and tubs, can mean the tank is full or the drain field is not absorbing water well. Look at your yard. Soggy ground, bright green grass over the field, or a smell outdoors points to the system rather than the toilet.

A septic tank is pumped by a septic company, not by a plumber, so if the tank needs pumping you will need one of those. Ryan does septic system repair, and he can tell whether a problem sits in the house plumbing or in the system outside. See septic system repair.

Safe to Try Yourself vs. Call Now

Safe to try

• Use a flange plunger with steady pushes and pulls
• Use a closet auger, the short cable made for toilets
• Stop flushing wipes, towels, floss, and swabs
• Flush less paper at a time

Call or text

• It clogs again within a few weeks of being cleared
• The tub or another drain gurgles or backs up
• Something hard is stuck and will not move
• You are on septic and the yard is wet or smells
• It clogs even with only a little paper

Skip chemical drain cleaners. They do not clear a toilet well and they leave harsh liquid in the bowl. Estimates are free, with no trip fee and no diagnostic fee, so you know the price before any work starts. The work is backed by a warranty, with the terms given in writing at the estimate.

Common Questions: A Toilet That Keeps Clogging

Why does my toilet clog every week?

A weekly clog usually means the toilet design is weak, too much paper or wipes are going down, or there is a partial blockage past the toilet. If only this toilet is affected, start with the toilet and what you flush. If it keeps returning, have the line checked.

Are low-flow toilets the reason mine keeps clogging?

Low-flow toilets are not the cause by themselves. Many work well on 1.28 or 1.6 gallons. A poorly designed or very old one can clog easily, though, so if yours always has, a better toilet may be the fix.

Could my septic tank be why the toilet keeps clogging?

Yes. A full tank or a drain field that is not absorbing can make every drain slow, and the toilet is often where you notice it first. Check the yard for wet spots or a smell, and ask Ryan to look.

Is one clogged toilet a sign of a main line problem?

Not always. One toilet that clogs alone usually has a local cause. If other fixtures are slow or the tub gurgles when you flush, the main line is more likely. See the page on signs of a clogged main sewer line.

Do flushable wipes cause repeat clogs?

They are a top cause. They flush out of the bowl and then catch farther down, where they gather more debris. Put wipes in the trash, even the ones labeled flushable.