Quick answer
To fix a toilet that keeps clogging, start by using a plunger to clear minor blockages. If that fails, try a toilet auger to break up or remove the clog. Regularly cleaning the tank and checking for excessive toilet paper use can prevent recurring clogs.
Confirm the symptom
- Toilet drains slowly after each use
- Water overflows or rises quickly after flushing
- Multiple plunging attempts don't resolve the clog
- Clogs return within a day or two
- Toilet gurgles or makes unusual noises when flushing
Tools and prep
- Rubber plunger (flange type preferred)
- Toilet auger (also called a closet auger)
- Rubber gloves
- Bucket (to catch overflow if needed)
- Old towels or rags
- Turn off water supply to the toilet before starting
- Wear non-slip shoes for safety
Step-by-step troubleshooting
- Use a PlungerDo: Create a tight seal around the drain hole with the plunger. Pump up and down vigorously for 20–30 seconds.Observe: Water level drops and the clog clears.Means: The clog was minor and dislodged.Next: Flush the toilet to confirm it drains properly.
- Try a Toilet AugerDo: Insert the auger cable into the toilet bowl and push it through the drain until you feel resistance. Rotate the handle to break up or retrieve the clog.Observe: Water level drops and the auger retrieves debris or the clog clears.Means: The clog was deeper and required mechanical removal.Next: Flush the toilet to test for proper drainage.
- Inspect for BlockagesDo: Check the toilet trap (curved pipe under the bowl) for visible blockages or buildup.Observe: You find a foreign object, toilet paper buildup, or mineral deposits.Means: The clog is caused by physical obstruction or buildup.Next: Remove the object or use a brush to clear the trap if possible.
- Check Water Level in the TankDo: Ensure the water level in the tank is about 1 inch below the overflow tube.Observe: Water level is too high or too low.Means: Improper water level can lead to weak flushes and clogs.Next: Adjust the float valve to set the correct water level.
- Clean the Toilet TrapDo: Use a long-handled brush or a small plumbing snake to clean out any buildup in the trap and drain line.Observe: Debris or mineral buildup is removed from the trap.Means: Buildup was restricting water flow and causing clogs.Next: Flush the toilet to ensure water flows freely.
- Test for Ventilation IssuesDo: Check the roof vent for blockages by running water down the toilet while someone checks the vent for airflow.Observe: No airflow or water drains slowly.Means: A blocked vent is causing drainage issues.Next: Call a professional plumber to clear the vent.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Toilet Paper or Tissue Buildup Excessive use of high-absorbency or non-degradable toilet paper can cause recurring clogs. | Common | Easy | None |
| Foreign Objects Toys, feminine hygiene products, or other items flushed down the toilet can cause blockages. | Sometimes | Easy–Medium | Toilet auger |
| Mineral Deposits Hard water can lead to mineral buildup in the toilet trap and drain line, restricting water flow. | Sometimes | Easy–Medium | Vinegar or descaling solution |
| Low-Flow Toilets Toilets with low water flow may not flush waste effectively, leading to frequent clogs. | Sometimes | Medium | Water displacement device |
| Blocked Vent Pipe A clogged roof vent can prevent proper air flow, causing slow drainage and clogs. | Rare | Hard | Professional plumber |
| Wax Ring Issues A damaged wax ring can allow debris to accumulate around the base of the toilet, causing partial blockages. | Rare | Medium | New wax ring |
Parts matching
Common parts and supplies needed to fix a toilet that keeps clogging include:
- Rubber plunger
- Toilet auger
- Toilet brush
- Vinegar or descaling solution (for mineral buildup)
- Water displacement device (for low-flow toilets)
- New wax ring (if reseating the toilet is needed)
Purchase a high-quality flange plunger and toilet auger for best results. For recurring clogs, consider upgrading to a high-efficiency toilet model.
When to call a professional
- Clogs return immediately after clearing
- You find a foreign object that cannot be removed with an auger
- The toilet trap or drain line is damaged or cracked
- You suspect a blocked vent pipe or main sewer line issue
- Water continues to overflow despite clearing the clog
- You're unsure about how to safely clear the clog or make repairs
FAQ
Why does my toilet keep clogging even after I clear it?
Recurring clogs may be caused by excessive toilet paper use, low water flow, or a partially blocked drain line. Check for buildup in the trap and ensure the water level in the tank is correct.
Can I use a regular plunger for a toilet clog?
Yes, but a flange plunger is more effective for toilets because it creates a better seal around the drain hole.
How do I know if the clog is in the toilet or the main sewer line?
If other drains in your home are also slow or backing up, the issue may be in the main sewer line. A professional plumber can use a sewer camera to diagnose the problem.
Is it safe to use chemical drain cleaners for toilet clogs?
No, chemical drain cleaners can damage your plumbing and are not recommended for toilets. Use a plunger or auger instead.
How can I prevent future toilet clogs?
Use toilet paper designed to dissolve quickly, avoid flushing non-degradable items, and clean the trap regularly to remove buildup.