A toilet that keeps running can waste a lot of water and increase your utility bill. The good news is that this is a very common problem and can usually be fixed at home without calling a plumber.
In this guide, you’ll learn why a toilet keeps running and simple DIY fixes to stop it.
Common Toilet Running Problems
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Water keeps flowing after flushing
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Toilet refills slowly or continuously
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Hissing or trickling sound from tank
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Tank overflows into overflow tube
Why Toilet Keeps Running
Some common reasons include:
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Worn-out flapper valve
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Float set too high
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Faulty fill valve
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Chain stuck or too short
Fix 1: Check the Flapper Valve
This is the most common cause.
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Remove tank lid
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Check flapper for wear or damage
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Replace flapper if not sealing properly
Fix 2: Adjust the Float
High water level causes overflow.
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Locate float
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Lower float level
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Ensure water stops below overflow tube
Fix 3: Check the Chain
Chain should move freely.
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Adjust chain length
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Make sure it’s not tangled
Fix 4: Clean or Replace Fill Valve
Sediment blocks proper closing.
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Turn off water supply
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Clean fill valve
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Replace if damaged
Fix 5: Test After Repairs
Always test your fix.
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Turn water back on
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Flush toilet
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Check for leaks
Safety Tips
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Turn off water supply before repairs
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Handle porcelain carefully
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Avoid over-tightening parts
When to Call a Plumber
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Toilet leaks from base
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Tank cracks
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DIY fixes don’t work
