Why Is My Toilet Continuously Running After I Flush My Toilet?

Blake’s Answer

A toilet that keeps running after a flush almost always points to an internal part wearing out. The two most common culprits are the flapper and the fill valve. Over time, the rubber flapper can harden, warp, or get sediment buildup that prevents it from sealing properly. When you flush, the flapper lifts and lets water rush into the bowl, but if it doesn’t drop back down with a tight seal, water will continue to trickle into the bowl. The fill valve can also deteriorate or clog with sediment, causing it to malfunction and let water keep flowing. In practice, most plumbers recommend replacing both parts at the same time, since if one is worn out, the other often isn’t far behind. This way, you won’t have to call again in a few weeks when the second part gives out.

Summary

A running toilet usually means a worn-out flapper or fill valve. Both parts control the water flow inside the tank, and when they don’t seal properly, water continuously escapes into the bowl. The best solution is to replace both the flapper and the fill valve during the same service visit, ensuring your toilet operates efficiently without wasting water.