Running Toilet: Causes, Fixes, and When to Call a Plumber
A toilet that keeps running after you flush usually comes down to a problem with the tank—something is preventing the flapper from sealing, regulating the water level, or allowing water to drain properly. Because the issue can waste significant water over time, it’s worth diagnosing promptly.
Start by observing the behavior: does the toilet run constantly, run intermittently, or stop after a short delay? The pattern helps narrow the cause and determine whether you can fix it yourself or need professional help.
Common causes of a running toilet
One of the most frequent culprits is a worn or misaligned flapper. The flapper is the rubber seal that covers the tank’s flush valve; if it doesn’t close tightly, water keeps refilling the bowl.
Another common cause is a malfunctioning fill valve or float. If the float is set too high, the tank may refill beyond the correct l ... Read more »

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