3 Causes of a Toilet Leaking from the Cistern When Flushed
A leaking toilet can be a frustrating issue, especially when the water drips from the cistern each time you flush. Not only does it waste water, but it can also lead to higher bills and even potential water damage if left unchecked.
There are a few common reasons why your toilet might be leaking from the cistern, and understanding these causes is the first step to fixing the problem. In most cases, a leak can be traced back to either a worn-out washer, a faulty inlet valve, or even a crack in the cistern itself.
While some of these issues are easy to spot, others might require a closer look or a bit of troubleshooting. By identifying the specific cause, you can decide whether a DIY repair is possible or if it’s time to call in a plumber to help keep your toilet leak-free.
1. Worn Out or Damaged Washer
A worn-out or damaged washer is a common cause of leaks from the cistern when you flush. This small but essential part helps create a tight seal between the cistern and the toilet bowl. Over time, washers can wear out or degrade, leading to leaks.
Here’s how to identify and address the issue:
- Signs of wear: If you notice water dripping from the cistern onto the toilet bowl or around the base of your toilet, a damaged washer could be the culprit. Additionally, any pooling water at the base of the toilet may indicate that the seal is compromised.
- Causes of washer damage: Washers can deteriorate from regular use, age, or exposure to hard water. They may crack, stiffen, or lose their flexibility, which affects their ability to form a watertight seal.
- Fixing the washer: Turn off the water supply and flush the toilet to empty the cistern. Then, remove the washer and inspect it for damage. If it looks cracked or worn, replace it with a new one from a hardware store. Make sure it fits snugly for a proper seal.
- Regular inspection: Check the washer periodically, especially if your toilet is older. Early detection of wear can help prevent leaks before they start.
2. Faulty Inlet Valve
A faulty inlet valve is another common reason your toilet might be leaking from the cistern when flushed. The inlet valve controls the water flow into the cistern, and when it malfunctions, it can cause water to leak continuously.
Here’s what to look out for and how to handle it:
- Signs of a faulty valve: If you hear a constant trickling or hissing sound after flushing, it’s a good indication that the inlet valve isn’t shutting off properly. This often leads to water dripping into the bowl or leaking around the cistern.
- Causes of inlet valve issues: Over time, inlet valves can become worn or clogged with debris, especially in areas with hard water. Sometimes, the float attached to the valve gets misaligned, causing the valve to stay open and let water leak through.
- Fixing the valve: Start by turning off the water supply to the toilet. Remove the lid from the cistern and inspect the inlet valve. Check for any visible damage, debris, or misalignment. If needed, clean or replace the valve to restore proper function.
- Adjusting the float: Often, a simple float adjustment can solve the issue. Ensure it’s positioned correctly to allow the valve to close fully when the cistern is full, preventing leaks and conserving water.
3. Cracks in the Cistern
Cracks in the cistern can be a serious cause of leaks, especially if they’re not immediately visible. While less common than other issues, cracks can develop over time and lead to water seeping out each time you flush.
Here’s how to spot and deal with cistern cracks:
- Signs of cracks: If you notice water pooling around the base of the toilet or moisture on the outside of the cistern, it could be due to a hidden crack. Hairline cracks can often go unnoticed until they start causing leaks.
- Causes of cistern cracks: Cracks can occur due to wear and tear, impact damage, or even the natural expansion and contraction of materials over time. Older cisterns, in particular, are more prone to this kind of damage.
- Identifying the crack: Start by thoroughly inspecting the cistern for visible cracks. For hidden ones, try drying the cistern completely and then watch for any areas that become damp. You might also use a tissue to detect small leaks as it will show any moisture immediately.
- Repair or replace: Small cracks can sometimes be patched with waterproof sealant as a temporary fix, but this isn’t a permanent solution. For larger cracks or ongoing issues, it’s best to replace the cistern to prevent further leaks and potential water damage.
- Regular inspections: Keep an eye on your cistern’s condition. Spotting cracks early can help you address them before they lead to bigger problems.
These easy tips are likely to help you to stop your cistern from leaking. If problems persist, however, don’t hesitate to contact a qualified plumber before the situation gets worse.
How to Maintain Your Toilet Cistern
Maintaining your toilet cistern can prevent pesky leaks and keep your toilet running smoothly. Regular upkeep not only extends the lifespan of your toilet but also helps you avoid costly water bills and unnecessary repairs. The good news? Basic cistern maintenance is easier than you might think.
First, check for any visible signs of wear or damage on the washer, inlet valve, and other internal components. Even small cracks or worn-out parts can lead to leaks when you flush. Replacing a worn washer or adjusting the inlet valve might be all it takes to stop a leak before it gets worse.
Next, clean the cistern regularly to remove mineral buildup that can interfere with its mechanisms. Simply flushing the cistern with a bit of white vinegar and water can dissolve any limescale and keep things working smoothly.
It’s also a good idea to keep an eye on your water levels. If the water is consistently too high, it could be a sign that the inlet valve needs adjustment. Lastly, listen for any unusual sounds, such as continuous hissing or dripping, which could indicate a problem.
With these simple steps, you’ll ensure your toilet cistern remains leak-free and in top-notch condition.
Keep the Cistern Flowing
A leaking toilet cistern can be a real nuisance, but understanding the causes can help you tackle the problem effectively. Whether it’s a worn-out washer, a faulty inlet valve or a crack in the cistern, knowing what to look for is key to fixing the cistern issue.
While some leaks are easy DIY fixes, like replacing a washer or adjusting the inlet valve, others might require more attention, especially if there are cracks involved.
Regularly inspecting your toilet’s components can prevent small issues from turning into bigger, more expensive repairs. If you’re unsure about how to proceed or if the problem persists, don’t hesitate to call a professional plumber. They can help ensure your toilet stays leak-free and runs smoothly for the long haul.
Please note: This information is provided for advice purposes only. Regulations differ from state to state, so please consult your local authorities or an industry professional before proceeding with any work. See Cyber Plumbers’ Terms & Conditions here.
