How do you stop a running toilet?

A running toilet is not only an annoying issue but also a costly one. If your toilet runs continuously, it’s wasting water, which leads to higher water bills.

Fortunately, this is a problem that can often be solved with a few simple adjustments or part replacements. In this guide, we’ll help you understand the common causes of a running toilet and walk you through how to fix it.

There are several reasons why your toilet might be running continuously. The most common causes are related to issues with the flush valve, overflow tube, or fill valve:

• Flush valve problems - The flush valve controls the flow of water from the tank into the toilet bowl. If the rubber flapper valve is damaged, worn out, or dirty, it might not seal properly, allowing water to leak from the tank into the bowl. This can lead to constant running as the tank tries to refill.

• Overflow tube issues - The overflow tube prevents the tank from overflowing if the water level gets too high. If the overflow tube is too short or misaligned, water may flow constantly into the toilet bowl. Ensure the tube is positioned correctly and adjust it if necessary.

• Fill valve malfunctions - The fill valve controls the flow of water from the main supply into the tank. If the fill valve is malfunctioning, it may not stop the water supply from flowing once the tank reaches the correct level. A faulty fill valve will lead to a running toilet.

If your toilet is running continuously, you can often fix it yourself by following these steps:

1. Identify the problem area - The first step is to remove the cistern lid and observe the internal components of the tank. Flush the toilet and watch how the water behaves to pinpoint the issue. Check for any visible issues with the flush valve, overflow tube or fill valve.

2. Check the water level - Ensure that the water level in the tank is just below the overflow pipe. If it’s too low, you may need to adjust the water valve to allow more water to fill the tank. If it’s too high, water will spill into the overflow tube, causing a running toilet.

3. Inspect the flapper - The flapper is a rubber seal that covers the flush valve opening. If it’s warped, dirty, or damaged, it may not close properly, allowing water to leak into the toilet bowl. Check the flapper and replace it if necessary. If the chain attached to the flapper is tangled or too tight, adjust it to ensure the flapper closes correctly.

4. Check the float - The float controls the water level in the tank. If the float is too high, the tank will overfill and the water will spill into the overflow tube. If the float is too low, the tank may not fill properly. Adjust the float arm or cup to achieve the correct water level, typically 1 to 2 inches below the overflow tube.

5. Inspect the overflow tube and fill valve - Check the overflow tube to make sure it’s the correct height; typically 8 to 12 inches above the bottom of the tank. If the tube is too short, it could be causing the toilet to run constantly. Additionally, inspect the fill valve to ensure it’s functioning properly. If it’s faulty, you may need to replace it.

6. Flush and test - Once you’ve inspected and adjusted all the components, flush the toilet again to see if the issue is resolved. If the toilet still runs, further repairs may be necessary, or you may need to replace certain parts.

While many running toilet issues can be resolved with DIY fixes, some problems are better left to professionals. An approved plumber can replace worn-out parts, adjust components to ensure proper function and help you avoid long term damage or leaks.