A toilet clog is frustrating enough when it happens once. When it keeps happening, though, it is usually a sign that something more than a little too much toilet paper is going on.
Many recurring toilet clogs start with a small issue that gets worse over time. There may be a partial blockage in the toilet trap, buildup farther down the drain line, a plumbing vent issue, or a problem with the main sewer or septic system. The good news is that identifying the cause early can help prevent an overflowing toilet, water damage, and a much bigger plumbing repair.
Here are some of the most common reasons a toilet keeps clogging and what you can do about it.
Too Much Toilet Paper
Using too much toilet paper is one of the most common reasons for an occasional clog. Even toilet paper that is labeled septic-safe or flushable still needs time and enough water to break down as it moves through the plumbing.
A toilet can clog more easily when several large wads of toilet paper are flushed at once. Thick, quilted toilet paper can also create problems in older plumbing systems or toilets with weaker flushing power.
If your toilet only clogs after a large amount of paper is used, the toilet itself may be working normally. Try using less paper per flush or flushing once halfway through if needed.
However, if the toilet clogs even when very little paper is used, there may be a blockage farther down the line.
Something Other Than Toilet Paper Is Being Flushed
Toilets are designed to handle human waste and toilet paper. That is it.
Many household items are marketed as flushable, but that does not mean they are safe for every plumbing system. Wipes, paper towels, facial tissues, cotton balls, dental floss, feminine hygiene products, and baby wipes can all cause clogs.
Even wipes labeled flushable do not break down the same way toilet paper does. They can collect in bends in the pipe, catch on rough areas inside older drain lines, or combine with other debris to create a stubborn blockage.
Small items can also fall into the toilet by accident. Children’s toys, toothbrushes, shampoo caps, air freshener clips, and other objects may get lodged in the toilet trap. A plunger may temporarily move the object, but it usually will not remove it completely.
If your toilet keeps clogging after something may have been dropped into it, it is a good idea to call a plumber rather than continue flushing. Repeated flushing can push the object deeper into the line and make it harder to remove.
There Is a Partial Blockage in the Toilet Trap
Every toilet has a built-in curved section of pipe called a trap. It holds water in the bowl and helps prevent sewer gases from coming back into the bathroom.
Because the trap has bends, it is a common place for paper, wipes, or foreign objects to get stuck. A partial blockage may allow the toilet to flush sometimes, but the water may rise higher than normal before slowly draining away.
You may notice that the toilet needs frequent plunging, flushes weakly, or bubbles after you flush. These are all signs that something may be lodged in the toilet or just beyond it.
A toilet auger can sometimes remove a blockage from the trap. Unlike a regular drain snake, a toilet auger is designed to reach through the toilet without scratching the porcelain. If the auger does not solve the issue, the clog may be farther down the drain line.
Your Toilet Does Not Have Enough Flushing Power
A toilet needs enough water and pressure to move waste through the trap and into the drain line. If it does not, clogs can happen more often.
Older toilets may not flush as strongly as they once did. Mineral buildup can block small openings under the rim of the bowl, reducing the amount of water that enters during a flush. The toilet may also have a worn flapper, an improperly adjusted fill valve, or a tank that is not filling with enough water.
A weak flush can look like this:
- Water swirls around the bowl but does not clear waste well
- The bowl fills high before slowly draining
- You need to flush more than once
- The toilet works better after you plunge it
- Other toilets in the home seem to flush normally
If only one toilet is clogging and the flush seems weak, the problem may be with that toilet rather than the entire plumbing system.
There Is a Clog Farther Down the Drain Line
Sometimes the toilet is not the real problem. The clog may be farther down the pipe that carries waste away from the bathroom.
Hair, soap residue, paper products, grease, and other debris can build up inside drain lines over time. This is especially common in older homes where pipes may have rough interior surfaces, corrosion, or buildup that catches debris more easily.
A partial blockage in the branch drain can make it seem like the toilet is constantly clogging. You may be able to get the toilet flowing again with a plunger, but the clog returns because the line is still restricted.
If a nearby tub, shower, or sink drains slowly at the same time as the toilet, that is a strong sign that the issue is farther down the plumbing system.
The Plumbing Vent May Be Blocked
Your plumbing system has vent pipes that extend through the roof. These pipes allow air to move through the drain system so wastewater can flow properly.
Without enough air, water can have trouble moving through the pipes. This can lead to slow drains, bubbling toilets, gurgling sounds, and repeated clogs.
Leaves, bird nests, dirt, and other debris can block a vent pipe. In some cases, the vent may have been installed incorrectly or may not be large enough for the plumbing system.
Vent problems can be difficult to diagnose because the pipe is usually located on the roof. It is best to have a licensed plumber inspect the system rather than trying to access or clear a roof vent yourself.
You May Have a Main Sewer Line Problem
If more than one drain in your home is acting up, the problem could be in the main sewer line.
The main sewer line carries wastewater from your house to the city sewer connection or septic system. When it becomes clogged, wastewater may have nowhere to go. That can cause toilets, tubs, showers, and floor drains to back up.
Signs of a possible main sewer line clog include:
- Multiple drains are slow or clogged
- The toilet gurgles when you run water in a sink or shower
- Water backs up into the tub or shower after flushing
- You smell sewage near drains or outside the home
- The lowest drains in the home back up first
Main sewer line clogs can be caused by buildup, tree roots, damaged pipes, or items that should not have been flushed. This is not a problem to ignore. A sewer backup can create a major mess and may damage floors, walls, and belongings.
Tree Roots May Be Growing Into the Sewer Line
Tree roots naturally grow toward moisture. If there is a small crack, loose joint, or weak spot in a sewer line, roots can find their way inside.
Once roots enter the pipe, they can spread and catch toilet paper and other debris. The clog may start as an occasional problem, then become more frequent as the roots continue growing.
Homes with older sewer lines are more likely to have root intrusion, especially if there are large trees near the path of the sewer line. A plumber can use a sewer camera inspection to see what is happening inside the pipe and determine whether roots, damage, or buildup are causing the issue.
Your Septic Tank May Need Attention
For homes with septic systems, repeated toilet clogs can sometimes point to a full or failing septic tank.
A septic tank needs regular pumping and maintenance. When it becomes too full, wastewater may not move through the system properly. Toilets can flush slowly, drains may back up, and sewage odors may become noticeable.
If your toilet keeps clogging and you have a septic system, think about when the tank was last pumped. A professional septic inspection can help identify whether the tank, drain field, or connecting line is contributing to the problem.
What You Can Try Before Calling a Plumber
For a minor clog, start with a flange plunger. This type of plunger has an extended rubber flap that creates a better seal inside the toilet bowl.
Make sure there is enough water in the bowl to cover the rubber end of the plunger. Push and pull firmly several times, then check whether the water begins draining normally. Avoid flushing again until you are confident the clog has cleared.
You can also use a toilet auger if you suspect a clog in the toilet trap. Do not use a standard metal drain snake, since it can scratch the toilet.
Avoid using chemical drain cleaners in toilets. These products may not clear the blockage, and they can create a dangerous situation if a plumber later needs to work on the drain. They may also damage older pipes or seals.
When It Is Time to Call a Plumber
A plunger is helpful for a simple clog, but recurring toilet clogs need a closer look.
Call a plumber if:
- The toilet clogs repeatedly
- Water rises close to the rim when you flush
- You hear gurgling from the toilet or nearby drains
- Other drains are slow or backing up
- You suspect something is stuck in the toilet
- You notice sewage odors
- Water backs up into a tub, shower, or floor drain
- Your septic system may be full
- You have tried plunging and the clog keeps coming back
A professional plumber can inspect the toilet, clear the drain line, and determine whether the problem is isolated to one fixture or connected to the sewer or septic system.
Get Help With a Recurring Toilet Clog
A toilet that keeps clogging is not something you should have to live with. Whether the issue is a simple blockage, a damaged sewer line, tree roots, or a septic concern, getting to the source of the problem can save you from an unexpected backup later.
Action Air Plumbing & Septic provides plumbing, drain cleaning, sewer line, and septic services for homeowners in Midland, Odessa, and surrounding West Texas communities. If your toilet keeps clogging or your drains are showing signs of a larger problem, contact our team to schedule service and get your plumbing flowing properly again.