Sorry, the web browser you're using is not supported by this website.

Please use Google Chrome, Firefox, Safari, or another browser to access homex.com. Thank you.

Skip to main content

We use cookies to enhance your experience. For details on how we use cookies, collect data, & how to manage your consent please see our Cookie Policy & Privacy Policy.

My Toilet Keeps Running - The Issue May Be Fill Valve Problems

Your toilet should stop filling when the water pushes the fill valve float to the close position. However, if the float is set too high, in which case water will fill past the maximum height and go into the overflow tube, this can indicate flapper valve problems. Flappers can also cause issues if they don't seal correctly. This can happen from age (wear and tear), from debris, or a chain that’s too long or too short.

4 Reasons Why Your Toilet Keeps Running

1. Float issues

When you flush your toilet, the fill valve opens to allow water into the tank. The water refills and when it reaches the correct height, the float will rise and close off the water supply. If the float is set too high, the tank will overfill and drain into the overflow tube.

2. Fill valve problems

The toilet will also run water if the fill valve fails and allows water to fill past the float. Water will keep filling the tank and flow into the overflow tube.

3. Weakened flapper seal

There are also a few flapper issues that can cause toilet water to run. The flapper forms a seal on the drain seat and keeps the water in the tank until it is flushed. If the flapper is worn out, water will pass through.

4. Flapper chain is too tight

If the flapper chain is too tight, the flapper won't seal properly, causing water to pass through. If the flapper chain is too long, the excess chain can get caught under the flapper, preventing it from sealing. Excess sediment or debris in the tank can also cause the flapper not to seal properly.

What To Do If Your Toilet Keeps Running

  • Remove the lid from your toilet tank and set it aside. Check the water level inside the tank. The water level should be 1/4 of an inch below the top of the overflow tube. Some toilets will have a sticker or mark inside the tank indicating the correct water level. If the water is above that mark or even with the top of the overflow tube, the level is too high.

  • If the water level is not too high, the water could be running into the bowl. Look at the flapper on the bottom of your toilet's tank. You may need a flashlight to see it clearly. Does it look old, worn out, cracked, or chipped? If so, the water is likely entering the bowl from a weakened toilet flapper.

  • If the flapper itself looks good, check the chain attached to the float arm. When the chain is too tight, it can prevent the flapper from closing completely. The chain should have 1/2 of an inch of slack.

What to Do if Your Toilet is Running

A running toilet is usually solved by either replacing the toilet flapper (or wiping it clean if there's debris), adjusting the chain length on the flapper, or adjusting the float level so it's a 1/4 inch below the top of the overflow tube.

NOTE: This content is for informational purposes only, and HomeX and its affiliates disclaim all liability related to it. If you decide to perform any tasks based on this information, you assume all risks, including the risk of loss or damage to property or personal injury.

Let's Get It Fixed!

HomeX virtual experts will assess your issue (for free!) and can resolve simple problems.

What Did You Think of This Article?

What Did You Think of This Article?