How-To Videos

Repairing a Running Toilet

By: Danny Lipford

A constantly running toilet is not only annoying but a big waste of water. There are two common reasons a toilet won’t stop running, both of which are easy to fix. Here’s how to go repairing a toilet to keep it from running.

Replace Tank Flapper

If the rubber flapper at the bottom of the toilet tank is warped or damaged, water will seep out around it, causing the toilet to continue to run. To replace a defective flapper:

  1. Turn off the water to the toilet.
  2. Flush the toilet.
  3. Disconnect the chain from the flapper.
  4. Remove the flapper.
  5. Replace the flapper.
  6. Reconnect and adjust the chain to the flapper.
  7. Turn the water back on.

Adjust Tank Water Level

If water is constantly running into the overflow tube in the toilet tank, the fill valve in the tank needs to be adjusted. To adjust the water level in the tank:

  1. Turn the screw on top of the fill valve* to adjust the float in the tank so the toilet stops filling approximately 1” below the top of the overflow tube.
  2. Flush the toilet and check to see that the fill level is correct.

*Note: Some tanks have other methods of adjusting the height of the float.

Watch this video to find out how.

Further Information

Print   Video Transcript

A constantly running toilet means that the flapper isn’t sealing correctly or the fill valve is improperly adjusted. If the flapper is warped or damaged, turn off the water supply and empty the tank, then disconnect the flapper from the flush chain and unsnap it from the flush tower. Snap on a new flapper and reconnect the chain before turning back on the water.

If water is constantly running down the overflow tube, the fill valve needs to be adjusted. Turning the adjustment screw on the valve in one direction raises the water level and the other direction lowers it. The ideal level for a toilet tank is about an inch below the top of the overflow tube.



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3 Comments on “Repairing a Running Toilet”

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  • Mark Says:
    August 29th, 2016 at 7:37 pm

    I have been looking for an answer to this question, but after clicking on over 30 websites, no one addresses the kind of toilet that doesn’t have one of those ball fill valves. My fill valve does not have that big ball floater. Can anyone address how to adjust this other kind of fill valve?



  • Theo Says:
    July 6th, 2016 at 9:02 pm

    I am having the same issue as Lizard: full tank, float won’t stop water filling and is submersed



  • Lizard Says:
    March 18th, 2016 at 7:27 am

    I bought and replaced the whole float valve unit, which solved the problem for about a week. Now, once again the water won’t quit running in the toiley. It actually submerses the float because it won’t shut off. You can manually push the float up and that still won’t shut off the water. There’s got to be a reason and solution because, like I said, it worked properly shutting off like it was supposed to for about a week when it was new.


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