A running toilet is one of the most common plumbing problems homeowners face—and it’s not just annoying. A running toilet can waste up to 200 gallons of water per day, which can significantly increase your water bill. The good news? Many running toilets can be fixed quickly and easily with some basic tools and a little guidance.
This guide will walk you through diagnosing and fixing a running toilet, along with tips to prevent future problems.
Tools & Materials You’ll Need
- Adjustable wrench
- Screwdriver
- Replacement flapper (if needed)
- Chain (if worn)
- Replacement fill valve (optional)
- Towels or small bucket
Step 1: Turn Off the Water Supply
Before working on your toilet:
- Locate the shutoff valve behind the toilet near the floor.
- Turn it clockwise to close the water supply.
- Flush the toilet to drain the tank as much as possible.
Tip: Keep a towel handy to catch any residual water.
Step 2: Inspect the Flapper
The flapper is the rubber valve at the bottom of the tank that seals the flush valve. A worn, warped, or brittle flapper is the most common cause of a running toilet.
- Lift the flapper and check for cracks, mineral buildup, or misalignment.
- If damaged, replace it with a new flapper designed for your toilet model.
Step 3: Adjust or Replace the Chain
The chain connects the flush handle to the flapper.
- Check the chain length. Too short, and the flapper won’t seal; too long, and it may get caught under the flapper.
- Adjust the slack so the flapper sits fully on the flush valve.
Tip: If the chain is rusted or weak, replace it for a secure connection.
Step 4: Check and Adjust the Float
The float controls the water level in the tank. If it’s set too high, water will continuously flow into the overflow tube.
- For a ball float, bend the arm slightly downward.
- For a cylinder float, adjust the screw or clip to lower the water level.
- The water level should be about ½ inch below the top of the overflow tube.
Step 5: Replace the Fill Valve (If Needed)
If water keeps running even after flapper and chain adjustments:
- Turn off water supply.
- Disconnect the supply line and remove the old fill valve.
- Install the new fill valve per manufacturer instructions.
- Reconnect the supply line and turn the water back on.
- Test for leaks and proper operation.
Step 6: Test Your Repair
- Turn the water supply back on and let the tank fill.
- Flush several times to ensure the flapper seals properly.
- Check the water level and make sure the toilet stops running after each flush.
Tips to Prevent a Running Toilet
- Replace flapper and fill valves every 3–5 years.
- Avoid using harsh chemical cleaners in the tank—they can degrade rubber components.
- Clean out mineral deposits periodically to prevent buildup.
- Inspect the toilet annually for leaks or worn parts.
When to Call a Professional
Some running toilets require professional help if:
- The toilet continues to run after replacing flapper and adjusting float.
- The tank or bowl has cracks or leaks.
- You’re dealing with old, corroded plumbing connections.
- The problem is in the supply line or valve assembly that’s difficult to access.
Need a Running Toilet Fixed ?
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Ultimate Fixtures 
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