Why Your Toilet Keeps Running and How to Stop It thumbnail

Why Your Toilet Keeps Running and How to Stop It

Published Mar 15, 25
3 min read

A running toilet is not only annoying but can also waste a significant amount of water, increasing your utility bills. Understanding the common causes of running toilets and how to fix them can save you money and prevent further plumbing issues - Call a 24 Hour Plumber in Knightdale, NC. This article explains why toilets run continuously and how a plumber can help resolve the problem

Common Causes of a Running Toilet

1. Faulty Flapper

The flapper is a rubber component at the bottom of the toilet tank that controls water flow from the tank to the bowl. A worn-out or misaligned flapper often causes water to leak into the bowl continuously.

2. Chain Issues

The chain connecting the toilet handle to the flapper may be too short or too long, preventing the flapper from sealing properly.

3. Fill Valve Problems

The fill valve controls the water level in the toilet tank. A malfunctioning fill valve can cause the tank to overfill or fail to shut off, leading to a running toilet.

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4. Overflow Tube Issues

If the water level in the tank is too high, water can spill into the overflow tube and continuously drain into the bowl.

5. Sediment Buildup

Sediment or debris in the tank can affect the function of the fill valve, flapper, or other components, causing the toilet to run.

6. Worn or Damaged Components

Over time, components like gaskets, seals, or the flush handle can wear out, leading to leaks and continuous water flow. - Call a 24 Hour Plumber in Knightdale, NC

How to Stop a Running Toilet

1. Check the Flapper

Inspect the flapper for signs of wear or damage. If it’s not sealing properly, replace it with a new one.

2. Adjust the Chain

Ensure the chain is neither too tight nor too loose. It should allow the flapper to close fully while still lifting easily during a flush.

3. Test the Fill Valve

If the fill valve is malfunctioning, adjust its float or replace it to stop the tank from overfilling.

4. Adjust the Water Level

Make sure the water level is below the top of the overflow tube. You can adjust the float to control the water level.

5. Clean the Tank

Remove sediment or debris from the tank to ensure all components function smoothly.

6. Call a Plumber

If you’re unable to fix the issue yourself or suspect a more complex problem, a professional plumber can diagnose and repair the running toilet.

Why Call a Plumber?

While some running toilet issues can be fixed with basic DIY techniques, others require professional expertise. A plumber can:

  • Identify Underlying Issues: Hidden problems like cracks or worn-out seals can be hard to spot without experience.
  • Provide Long-Lasting Repairs: A plumber uses quality parts and techniques to ensure the issue doesn’t recur.
  • Save Time and Water: Quick professional repairs can prevent further water wastage and reduce your water bill.

FAQs About Running Toilets

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1. How much water does a running toilet waste?

A running toilet can waste up to 200 gallons of water per day, significantly increasing your utility costs.

2. What is the most common cause of a running toilet?

A faulty flapper is the most common culprit behind a running toilet.

3. Can I use the toilet while it’s running?

Yes, but it’s best to address the issue promptly to avoid water waste and potential damage.

4. How do I know if the fill valve is broken?

A broken fill valve may cause the tank to overfill, make unusual noises, or fail to shut off.

5. What tools do I need to fix a running toilet?

Basic tools like pliers, a screwdriver, and a replacement flapper or fill valve are usually sufficient for simple repairs.



6. Can sediment cause a running toilet?

Yes, sediment buildup in the tank can affect the flapper, fill valve, and other components, leading to continuous running.

7. When should I call a plumber for a running toilet?

If DIY fixes don’t resolve the issue or if you suspect a more complex problem, call a plumber for professional assistance.

Tips to Prevent a Running Toilet

  1. Perform Regular Maintenance: Inspect and clean your toilet’s components periodically to ensure proper function.
  2. Use Quality Parts: Replace worn-out components with high-quality parts to extend their lifespan.
  3. Check Water Pressure: High water pressure can strain toilet components and lead to malfunctions.
  4. Monitor Your Water Bill: A sudden increase in your water bill may indicate a running toilet or other leaks.
  5. Avoid Flushing Non-Flushable Items: Prevent clogs and damage by only flushing toilet paper and human waste.

Call Us to Fix Your Running Toilet



A running toilet can waste water and drive up your utility bills (Get the best on-call plumbers in Knightdale). Our experienced Knightdale, NC plumbers can quickly diagnose and fix the issue, ensuring your toilet operates efficiently. Contact us today for professional toilet repair services and peace of mind!

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