Toilet Not Level: How to Fix It

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Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

A toilet that rocks or feels unstable is likely not level. Check the floor flange, adjust the wax ring, or replace damaged parts. Always turn off the water supply before starting.

Confirm the symptom

Toilet rocks when sat on
Water leaks around base
Visible gap between toilet and floor
Uneven floor near toilet

Tools and prep

Adjustable wrench
Screwdriver
Level
Plumber's putty or wax ring
Bucket or towels
Turn off water supply
Protective gloves

Step-by-step troubleshooting

Turn Off Water Supply
Do: Locate the shut-off valve behind the toilet and turn it clockwise to stop water flow.
Observe: Water stops flowing into the tank.
Means: Water is safely off.
Next: Drain Tank and Bowl
Drain Tank and Bowl
Do: Flush the toilet and hold the flapper open to drain water into a bucket or onto a towel.
Observe: Tank and bowl are mostly empty.
Means: Ready to work on the toilet.
Next: Check Floor Flange
Check Floor Flange
Do: Use a level to check if the toilet is sitting evenly on the flange. Look for cracks or damage to the flange.
Observe: Toilet is uneven or flange is damaged.
Means: Flange may need repair or replacement.
Next: Adjust or Replace Flange
Adjust or Replace Flange
Do: If the flange is damaged, replace it with a new one. If it's just uneven, add shims or adjust the bolts.
Observe: Toilet sits level on the flange.
Means: Flange is properly adjusted.
Next: Reinstall Toilet
Reinstall Toilet
Do: Place the toilet back on the flange, ensuring it's level. Tighten the bolts securely but not overly tight.
Observe: Toilet is stable and level.
Means: Toilet is correctly reinstalled.
Next: Test for Leaks
Test for Leaks
Do: Turn the water supply back on and check for leaks around the base and connections.
Observe: No water leaks are present.
Means: Toilet is properly sealed.
Next: Final Check

Common causes

Cause	Likelihood	Difficulty	Part often needed
Damaged Floor Flange A cracked or broken flange can't support the toilet evenly.	Common	Medium	Toilet flange
Improper Installation Toilet not bolted down correctly or wax ring not seated properly.	Common	Easy	Wax ring
Settling or Uneven Floor Home settling can cause the floor to slope near the toilet.	Sometimes	Hard	Shims
Worn Out Bolts Loose or corroded bolts can't hold the toilet securely.	Sometimes	Easy	Toilet bolts
Incorrect Wax Ring Using the wrong size or type of wax ring can lead to leaks and instability.	Sometimes	Easy	Wax ring
Broken Toilet Base Cracks in the toilet base can prevent it from sitting level.	Rare	Hard	Toilet replacement

Parts matching

Common parts needed for a toilet not level include:

Toilet flange
Wax ring
Toilet bolts
Shims
Plumber's putty

Always use a high-quality wax ring for a proper seal and stability.

When to call a professional

Toilet continues to rock after adjustments
Floor flange is severely damaged and hard to replace
Water leaks persist despite proper installation
You're unsure about the correct parts or installation process
The toilet base is cracked or damaged beyond repair

FAQ

Can I use shims to level a toilet?

Yes, shims can help level a toilet on an uneven floor. Place them under the toilet base and secure with bolts.

How do I know if the wax ring needs replacing?

If the toilet rocks or there are water leaks around the base, the wax ring is likely damaged and needs replacement.

What tools do I need to fix a toilet that's not level?

You'll need an adjustable wrench, screwdriver, level, wax ring, and a bucket or towels to catch water.

Is it normal for a toilet to rock slightly?

No, a toilet should sit firmly and level. Rocking indicates an issue with the flange, bolts, or wax ring.

Can a broken floor flange be repaired without replacing the toilet?

Yes, a damaged floor flange can often be replaced without removing the toilet, though it may require some adjustments.