Why Won’t My Toilet Stop Running?

A constantly running toilet isn’t just annoying—it’s also wasteful. In fact, a running toilet can waste hundreds of gallons of water a day and spike your utility bill. The good news? Most causes are simple, inexpensive fixes you can handle without calling a plumber. Let’s look at the most common culprits and how to stop that endless flow.

1. Flapper Problems
The rubber flapper at the bottom of the tank controls water flow into the bowl. If it’s worn out, warped, or not sealing properly, water will continuously leak. Replacing a flapper is quick, cheap, and often the easiest fix.

2. Chain Issues
Sometimes the chain that connects the flush handle to the flapper gets tangled or too short/long, preventing the flapper from closing. Adjusting the chain length can often stop the running immediately.

3. Float Out of Adjustment
The float controls how much water fills the tank. If it’s set too high, water spills into the overflow tube and keeps the toilet running. Lowering the float ensures the tank fills only to the right level.

4. Fill Valve Malfunction
If the fill valve is worn out or faulty, water won’t shut off properly. Replacing a fill valve is a straightforward repair that can save a lot of wasted water.

5. Mineral Build-Up
Hard water can cause sediment to build up in the fill valve or flapper, leading to leaks. Cleaning these parts or replacing them may solve the problem.

When to Call a Plumber
If you’ve tried these fixes and the toilet is still running, there may be a deeper issue—like a cracked overflow tube or worn tank components. In that case, calling a professional will save you more frustration (and money on your water bill).

Bottom Line
A running toilet is usually an easy DIY fix. Check the flapper, chain, float, and fill valve first. A quick repair can stop the noise, conserve water, and keep your utility bills under control. If you want a professional plumber to come do it for you, give Davis Plumbing a call at (951) 657-0393.