What Causes a Running Toilet and How to Fix It Until Help Arrives

A running toilet is usually caused by one of three common issues: a worn-out flapper, a misaligned float, or a faulty fill valve. These components regulate the flow of water from the tank to the bowl and control refilling after a flush.

First, remove the tank lid and inspect the flapper at the bottom of the tank. If it’s not sealing properly, water will continue to leak into the bowl. Try jiggling the handle to reseat the flapper or gently press it down to stop the flow temporarily.

Next, check the float—it should rise and stop the water once it reaches the fill line. If it’s too high, adjust it downward by turning the screw on top of the fill valve or gently bending the float arm if it’s metal.

If the water continues to run, turn off the shut-off valve located behind the toilet near the floor. This will stop the water supply until a plumber can inspect and repair the issue.

For professional toilet repairs in Metro Atlanta or Marietta, A&G Plumbing and Drain is just a call away—we’ll get your bathroom back to normal fast.