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Leaky Toilet Cistern: How to Fix this Plumbing Nightmare

Dec 28, 2023

A leaky toilet cistern is one of the most annoying bathroom issues that can happen in a household.


Whether you want to get out of that messy leaking situation or just want to take preventive measures, this guide will help you discover the common culprits behind a leaky toilet cistern. We’ll also go through the potential consequences if they are left untreated and ways to resolve this issue.

Common Causes of a Leaky Toilet Cistern

There are quite a few things that cause your cistern to leak. Understanding these causes can help you identify the source of the leak for accurate diagnosis and effective repairs.


Here are some of the most common causes of a leaky toilet cistern:

1. Faulty Outlet Valve

One of the most important components of a toilet cistern is the outlet valve. It controls the release of the water from the tank to the bowl while flushing. If the valve is stuck open, old, or the washer inside the valve is worn or perished, it may not efficiently seal. This can result in water continuously leaking into the toilet bowl. Constant leaking can result in a running toilet and water loss over time.


2. Damaged Inlet Valve

A Inlet valve in a toilet cistern is what regulates the water level after a flush. If the inlet valve is damaged or faulty, it may not effectively seal off the water from flowing, causing the cistern to overflow. The excessive water can spill into the overflow tube and lead to continuous leaks into the toilet bowl.

3. Worn-Out Flush Button

The flush buttons are the levers that initiates the flushing. Due to constant use over time, a worn-out flush button may not properly lift or close the outlet valve. This, in turn, can result in water leaks and an inefficient flushing process.

4. Cracked Cistern

A cracked cistern is a more severe issue that can cause water leakage. The cracks may be due to manufacturing defects, physical damage, or age-related wear. Although these leaks may appear occasionally or just during flushing, aside from wastage of water, they can also result in a bigger problem, like structural damage to the bathroom, if not resolved promptly.

The Consequences of Ignoring a Cistern Leaking

Ignoring a cistern leaking can go beyond the inconvenience of the visible leak. It may also result in various implications, such as:

Water Wastage

Whether occasional or continuous, a leak can cause a significant loss of water over time. Aside from environmental implications, water waste from a leaky toilet cistern can unnecessarily strain local water resources.


Increased Water Bill

Continuous water leakage from a faulty toilet cistern can significantly affect water consumption. As the toilet constantly refills due to the leak, it triggers a spike in water usage, resulting in a higher monthly water bill.


Potential Structural Damage

Prolonged neglect of a leaky toilet cistern can lead to more severe consequences, including mould growth, rot, and potential structural damage to the bathroom.

How to Fix a Leaky Toilet Cistern

Addressing the leak promptly not only avoids these structural issues but also prevents the need for extensive and costly repairs in the future. Here are some practical solutions on how to fix a leaky toilet cistern.


  • Choosing a dependable local plumber is crucial for a successful and hassle-free leaky toilet cistern repair. 
  • Addressing the toilet cistern leakage promptly not only avoids structural damage but also prevents the need for extensive and costly repairs in the future.
  • Plumbing experts not only diagnose and repair the issue accurately but also identify any underlying issues and offer the assurance of guaranteed workmanship.
  • Regular maintenance practices can help you avoid cistern leaks, and early detection methods empower you to address issues promptly before they escalate.
  • Although DIY attempts might be tempting, they are generally discouraged due to the following reasons:
    • Plumbing systems can be complex, and misdiagnosing the issue might lead to ineffective repairs. Inaccurate fixes could exacerbate the problem, causing more extensive damage and ultimately requiring professional intervention. 
    • Plumbing work must comply with NSW plumbing regulations, and attempting DIY repairs may unintentionally violate these rules, resulting in legal consequences. 
    • Professional plumbers possess the expertise and tools to accurately diagnose the root cause of the leak, ensuring a comprehensive and lasting solution. 
    • Relying on DIY methods might provide a temporary fix, but it’s often more prudent to enlist the services of a qualified plumber to guarantee the effectiveness, safety, and compliance of the repairs.

Book a Consultation with Eze-Flow Plumbing Today

Eze-Flow Plumbing is your trusted local partner for all your plumbing needs. Our team specialises in handling cistern leaks and blocked toilets with expertise and a commitment to high-quality service.


Booking a consultation with us is easy and convenient – schedule an appointment today to ensure your toilet troubles are addressed promptly and professionally. Don’t let a leaky toilet cistern turn into a plumbing nightmare. Let Eze-Flow Plumbing be your solution!

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