Toilet Problems: Diagnosis & Solutions
Most toilet issues have simple causes. Here's how to identify what's wrong and whether it's a DIY fix or needs professional help.
Common Toilet Problems
Toilet Keeps Running
A constantly running toilet wastes 200+ gallons per day. Usually caused by a worn flapper, misadjusted float, or faulty fill valve.
DIY difficulty: Easy — most fixes under $20 in parts
Toilet Won't Flush Properly
Weak or incomplete flushes often indicate low water level in the tank, a clogged rim jet, or a partial drain clog.
DIY difficulty: Moderate — may need adjustment or cleaning
Toilet Clogs Frequently
Repeated clogs can signal a partial blockage in the drain, too much toilet paper use, or older low-flow toilets with weak flush power.
When to call a pro: If a plunger doesn't clear it, or clogs happen weekly
Water Leaking at Base
Water pooling around the toilet base usually means the wax ring seal has failed. This allows sewer gas and water to escape.
DIY difficulty: Moderate — requires removing and reseating the toilet
Toilet Rocks or Wobbles
A wobbly toilet can break the wax seal over time, leading to leaks. Usually caused by loose bolts or an uneven floor.
DIY difficulty: Easy — often just needs tightening or shimming
Slow Tank Fill
If the tank takes forever to refill after flushing, the fill valve may be clogged or failing, or the supply valve isn't fully open.
DIY difficulty: Easy — check supply valve first
When to Call a Plumber
- →Toilet clogs repeatedly despite proper use
- →Water damage visible around the toilet base
- →Sewer smell coming from the toilet
- →Multiple toilets affected at once (main line issue)
- →You're uncomfortable with DIY repairs