A toilet that keeps running is one of the most common household plumbing issues that can be both irritating and wasteful. Not only does it create an annoying sound, but it also leads to increased water bills due to constant water flow. Understanding the reasons behind this problem can help you identify a solution quickly and efficiently, saving both water and money in the long run. In this blog post, we’ll explore the most common causes for a running toilet and provide practical solutions to fix them.

1. Faulty Flapper Valve

One of the primary reasons your toilet might keep running is a faulty or worn-out flapper valve. The flapper is a rubber seal at the bottom of the tank that lifts when you flush the toilet and then closes to allow the tank to refill. Over time, flappers can deteriorate due to wear and tear or the buildup of mineral deposits, preventing them from sealing properly.

Fix:
To solve this issue, turn off the water supply to the toilet and drain the tank by flushing. Then, inspect the flapper for any signs of wear, such as cracks, tears, or corrosion. If the flapper is damaged, replace it with a new one. You can find replacement flappers at most hardware stores or online. When installing the new flapper, make sure it fits properly and forms a tight seal when closed. This should stop the running water.

2. Chain Problems

The chain that connects the flush lever to the flapper may become too loose, too tight, or tangled over time. If the chain is too loose, it might prevent the flapper from fully closing, allowing water to continuously leak from the tank into the bowl. If it’s too tight, the flapper may not open fully, affecting the flushing mechanism.

Fix:
Check the chain for any issues. If it’s too tight, loosen it slightly so the flapper can move freely. If it’s too loose, adjust the chain to ensure it pulls the flapper up completely when you flush. Make sure the chain has just enough slack to allow the flapper to close properly. If the chain is worn or broken, replace it with a new one.

3. Float Issues

The float is a mechanism inside the tank that controls the water level. It rises with the water level and shuts off the fill valve when it reaches a certain height. If the float is set too high, it can cause the tank to overfill and water to continuously run into the overflow tube, preventing the tank from filling properly.

Fix:
Adjust the float to the correct water level. For most toilets, the water level should be about one inch below the top of the overflow tube. If your toilet has a float ball, bend the arm gently to lower the float. For newer toilets with a float cup, adjust the screw on the float’s stem to change its position. This adjustment should stop the water from running into the overflow tube.

4. Worn-Out Fill Valve

A worn-out or malfunctioning fill valve can also lead to a toilet that keeps running. The fill valve controls the flow of water into the tank after a flush. Over time, the fill valve can degrade, leading to improper sealing and constant water flow. You might notice a hissing sound as water continuously enters the tank.

Fix:
To fix this issue, you may need to replace the fill valve. Turn off the water supply and drain the tank by flushing. Disconnect the water supply line from the old fill valve, and remove the valve from the tank. Install a new fill valve by following the manufacturer’s instructions. Once installed, reconnect the water supply, turn the water back on, and check if the toilet still runs.

5. Debris in the Valve

Sometimes, debris, mineral deposits, or even dirt can accumulate in the fill valve or the flush valve, preventing them from functioning properly. This can cause water to run continuously, as the valve cannot close tightly due to the blockage.

Fix:
To clean the valve, turn off the water supply and drain the tank. Remove the fill valve or flush valve as needed and clean them using a soft brush or cloth to remove any buildup. If the valves are too corroded or damaged to clean effectively, replacing them may be the best option.

6. Overflow Tube Problems

The overflow tube in your toilet tank prevents the water from overflowing when the tank is too full. If the water level is set too high or the overflow tube is damaged, water may continuously flow into the tube, causing the toilet to run.

Fix:
Inspect the overflow tube for cracks or other visible damage. If the tube is cracked, you will need to replace it. If the tube is not damaged but the water level is too high, adjust the float to ensure the water level is one inch below the top of the overflow tube. This will prevent the water from continuously running into the tube.

7. Corroded or Faulty Flush Handle

In some cases, the flush handle itself can become corroded or misaligned. If the flush handle sticks or is difficult to move, it might not be fully triggering the flapper to close. This can cause the toilet to run.

Fix:
Examine the flush handle and its connection to the internal tank components. If the handle is loose, tighten it. If the handle is corroded, it may need to be replaced. You can replace the flush handle by removing the screws and installing a new one. Be sure to adjust the chain connection to ensure the flapper operates properly when the handle is pressed.

8. Cracked Tank

In rare cases, a cracked toilet tank can lead to continuous running water. If there’s a crack in the tank, water may leak out and cause the fill valve to constantly refill the tank, leading to running water.

Fix:
If you suspect that the toilet tank is cracked, you may need to replace the entire tank. In some cases, a small crack can be sealed using waterproof epoxy, but this is usually a temporary fix. Replacing the tank with a new one is the most reliable long-term solution.

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A toilet that keeps running is a frustrating issue that can waste a significant amount of water and lead to higher water bills. Fortunately, many of the common causes can be easily fixed with a little troubleshooting and basic DIY skills. Whether the issue is a faulty flapper, a problem with the float, or a worn-out fill valve, identifying the root cause is the first step toward resolving the problem. If you're noticing any of these plumbing issues in your home, don’t wait for them to escalate. Call ERM Plumbing & Heating today to schedule a full inspection of your plumbing system. Our team of expert plumbers specializes in maintaining and upgrading plumbing systems, we have the expertise to handle it all.

Don’t let plumbing issues ruin the comfort and value of your home—contact us today!

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