How To Fix Running Toilet

How to Fix Running Toilet – A Complete Guide

A running toilet can be a major annoyance and can lead to high water bills. If you’re experiencing a toilet that won’t stop running, it’s important to address the issue as soon as possible. In this guide, we’ll walk you through step-by-step on how to fix running toilet.

What Causes a Running Toilet?

Before we dive into the steps to fix a running toilet, let’s first understand what causes it. A running toilet is caused by water leaking from the tank into the bowl. This can happen due to several reasons such as:

  • Worn out flapper valve
  • Broken fill valve
  • Improperly adjusted float
  • Mineral buildup

Step-by-Step Guide to Fix Running Toilet

Step 1: Turn Off Water Supply

The first step to fix a running toilet is to turn off the water supply. Locate the shut-off valve near the base of the toilet and turn it clockwise to shut off the water supply.

Step 2: Empty the Tank

Flush the toilet to empty the water from the tank. If the water level in the tank is too high, use a bucket or towel to remove the excess water.

Step 3: Inspect the Flapper Valve

Inspect the flapper valve for any signs of wear and tear. If the flapper valve is worn out, it won’t seal the tank properly and water will leak into the bowl. Replace the flapper valve if necessary.

Step 4: Check the Fill Valve

Check the fill valve for any signs of damage. The fill valve is responsible for filling the tank with water after a flush. If the fill valve is damaged, it won’t be able to fill the tank properly, resulting in a running toilet. Replace the fill valve if necessary.

Step 5: Adjust the Float

Check the float to ensure that it’s properly adjusted. The float is responsible for regulating the water level in the tank. If the float is set too high, it will cause the water to overflow and leak into the bowl. Adjust the float if necessary.

Step 6: Remove Mineral Buildup

If there’s mineral buildup in the tank, it can cause the flapper valve to stick and not seal properly. To remove mineral buildup, pour a cup of vinegar into the tank and let it sit for an hour. Then, flush the toilet a few times to rinse the tank.

Step 7: Replace the Gasket

If none of the above steps work, it’s possible that the gasket between the tank and bowl is damaged. This can cause water to leak into the bowl and result in a running toilet. Replace the gasket if necessary.

FAQs on How to Fix Running Toilet

Q: How do I know if the flapper valve is the problem?

A: If you hear the toilet running constantly, it’s likely that the flapper valve is the problem. You can also check by putting a few drops of food coloring into the tank and see if it leaks into the bowl.

Q: Can I fix a running toilet myself?

A: Yes, you can fix a running toilet yourself by following the steps outlined in this guide.

Q: How long does it take to fix a running toilet?

A: It depends on the cause of the problem. In most cases, it can be fixed within an hour or two.


A running toilet can be a frustrating problem, but it’s not something that can’t be fixed. By following the steps outlined in this guide, you can fix a running toilet in no time. Remember to turn off the water supply before starting any repairs and always use caution when working with plumbing.