Toilet Running Constantly: Common Causes and Fixes
A toilet that runs constantly—sometimes quietly, sometimes noticeably—doesn’t just waste water. It can also drive up utility bills and indicate a problem inside the tank that’s easy to miss during day-to-day use.
While the exact cause varies by model, most constant-running issues come from a component in the toilet tank failing to seal properly or being set incorrectly. Here are the most common reasons and practical fixes to restore normal flushing behavior.
1) Flapper not sealing (most common)
The flapper is the rubber valve that closes the tank outlet after you flush. If it doesn’t seal fully—because it’s worn, warped, or coated with mineral deposits—the tank refills continuously and the toilet “runs.”
Fix: Remove the tank lid and inspect the flapper. If it looks cracked, hardened, or uneven, replace it. If it ... Read more »

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