Toilet Keeps Running Water: Fix It Yourself

Quick answer

A running toilet is usually caused by a faulty flapper or fill valve. Turn off the water supply, check the flapper chain, and adjust or replace parts as needed.

Confirm the symptom

• Water is continuously running into the toilet tank
• You hear water running even when the toilet isn't used
• The toilet tank fills and then stops but water continues to run
• The toilet water level is too high or too low in the tank

Tools and prep

• Adjustable wrench
• Screwdrivers (flathead and Phillips)
• Replacement flapper or fill valve
• Plumber's putty (if adjusting water level)
• Turn off the water supply to the toilet
• Paper towels or rag for cleanup

Step-by-step troubleshooting

1. Turn Off Water Supply
   Do: Locate and turn the shut-off valve under the toilet tank clockwise to stop water flow.
   Observe: Water stops entering the tank.
   Means: You can safely inspect and adjust internal parts.
   Next: Lift the tank lid and inspect the flapper.
2. Inspect the Flapper
   Do: Check if the flapper is damaged, worn, or not sealing properly.
   Observe: Flapper may be cracked, misaligned, or not closing fully.
   Means: A faulty flapper allows water to leak into the bowl.
   Next: Adjust or replace the flapper.
3. Adjust the Flapper Chain
   Do: Ensure the chain connecting the flapper to the flush handle is not too tight or tangled.
   Observe: Chain should have a slight slack but not drag on the tank floor.
   Means: A properly adjusted chain allows the flapper to seal correctly.
   Next: Test the flapper by lifting and releasing it.
4. Check the Water Level
   Do: Look at the water level in the tank; it should be about 1 inch below the overflow tube.
   Observe: Water level is too high or too low.
   Means: Improper water level can cause continuous running or incomplete flushing.
   Next: Adjust the float or fill valve to correct the water level.
5. Inspect the Fill Valve
   Do: Check if the fill valve is worn or not shutting off properly.
   Observe: Valve may be leaking or not closing fully.
   Means: A faulty fill valve allows water to continuously flow into the tank.
   Next: Replace the fill valve if damaged.
6. Test the Toilet
   Do: Turn the water supply back on and flush the toilet to see if the running stops.
   Observe: Water stops running after the tank fills.
   Means: The repair was successful.
   Next: Monitor the toilet for a few hours to ensure the issue is resolved.

Common causes

Parts matching

Common parts needed to fix a running toilet:

• Toilet flapper (most common replacement part)
• Fill valve (if water level or continuous running persists)
• Float assembly (for older toilets with ballcock mechanisms)
• Plumber's putty (to adjust water level if needed)

Purchase parts specific to your toilet model for best results.

When to call a professional

• Water continues to run after replacing all parts
• You notice significant water damage or mold growth
• You're unsure about the cause or how to fix it safely
• The toilet is old and may need a full replacement
• You hear unusual noises like gurgling or hammering in the pipes

FAQ

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