Why Your Toilet Keeps Running (and How to Fix It)

Milo S.

1/24/20252 min read

white tissue paper roll on blue background
white tissue paper roll on blue background

A running toilet is not only annoying but can also waste gallons of water and increase your water bill. Understanding the common causes and knowing how to fix them can save you time, money, and frustration. Here’s a comprehensive guide to why your toilet keeps running and what you can do to fix it.

Common Causes of a Running Toilet

1. Faulty Flapper Valve The flapper valve controls the flow of water from the tank to the bowl. If it’s worn out or misaligned, water will continuously leak into the bowl.

2. Chain Issues The chain connecting the flapper to the flush handle may be too long or too short, preventing the flapper from sealing properly.

3. Float Problems The float determines the water level in the tank. If it’s set too high, water will overflow into the overflow tube, causing the toilet to run continuously.

4. Faulty Fill Valve A malfunctioning fill valve may fail to shut off the water supply, causing the tank to overfill.

5. Mineral Buildup Over time, mineral deposits can build up on the flapper, fill valve, or other components, affecting their performance.

Step-by-Step Guide to Fixing a Running Toilet

1. Inspect the Flapper Valve

  • Turn off the water supply to the toilet.

  • Remove the tank lid and flush the toilet to empty the tank.

  • Check the flapper for signs of wear or damage.

  • If it’s worn out, replace it with a new one available at any hardware store.

2. Adjust the Chain

  • Ensure the chain has a slight slack but isn’t too loose.

  • Shorten or lengthen the chain as needed to allow the flapper to close securely.

3. Adjust the Float

  • Locate the float inside the tank.

  • If it’s a ball float, bend the arm downward to lower the water level.

  • For newer toilets with a cylinder float, adjust the float height using the screw or clip.

4. Clean or Replace the Fill Valve

  • Turn off the water supply and remove the fill valve.

  • Rinse it thoroughly to remove any debris or mineral buildup.

  • If cleaning doesn’t work, replace the fill valve with a new one.

5. Check for Leaks

  • Turn the water supply back on and monitor the tank for any leaks or continuous running.

  • If the problem persists, you may need professional assistance.

Why Call a Professional?

While many running toilet issues can be fixed with simple DIY steps, some problems may require expert knowledge. If you’re unable to identify or resolve the issue, a professional handyman can:

  • Diagnose the problem accurately

  • Provide high-quality repairs

  • Save you time and prevent further damage

Why Choose Full Coverage Handyman?

At Full Coverage Handyman, we specialize in plumbing repairs, including fixing running toilets. Our experienced team provides:

  • Quick and reliable service

  • Affordable solutions

  • Expert advice to prevent future issues

Final Thoughts

A running toilet may seem like a minor inconvenience, but it can lead to significant water waste and higher utility bills. By understanding the common causes and knowing how to fix them, you can keep your toilet functioning properly. For professional repairs and peace of mind, contact Full Coverage Handyman today. Call or text us today at 925-264-9646.