A continuously running toilet is usually caused by a worn flapper not sealing, a fill valve set too high, a broken or stuck float arm, or a chain that’s too short or tangled. Most fixes take 10 minutes and a $10 part — but if simple replacement doesn’t solve it, the issue is internal and a plumber should diagnose it.
Quick checks
- Replace the flapper — most common cause
- Adjust water level by adjusting the fill valve
- Check the chain — should have a small amount of slack
- Inspect the fill valve for cracks or stuck float
- Listen for the hiss-fill cycle restarting on its own
If simple fixes don’t stop the running, schedule a quick repair via our toilet service.
