Hearing the faint sound of water dripping or noticing a puddle around the base of your toilet can be alarming. A toilet leaking from a cistern when flushed is not just an inconvenience—it can waste litres of water daily and drive up your water bill. Addressing this issue promptly can save you money, conserve water, and prevent potential damage to your bathroom floor.
This guide will help you identify the common causes of a toilet leaking from the cistern and provide actionable steps to fix the problem efficiently.
Why Is Your Toilet Leaking from the Cistern When Flushed?
Toilets are designed to contain water within the cistern and bowl, ensuring an efficient flush every time. When leaks occur, they usually indicate a problem with the cistern’s internal components, seals, or connections. Common causes include:
- Worn-Out Seals or Washers: Over time, the rubber seals inside your cistern can deteriorate, allowing water to seep out.
- Cracked Cistern or Pipes: Damage to the cistern or connecting pipes can lead to leaks.
- Loose Bolts or Connections: Improperly tightened bolts and connections between the cistern and bowl may cause leaks.
- Blocked or Faulty Overflow Valve: A malfunctioning overflow valve can result in water escaping the cistern during a flush.
Knowing the root cause of the leak is the first step toward fixing the issue.
What to Do When Your Toilet Leaks from the Cistern During a Flush
1. Identify the Source of the Leak
Before attempting any fixes, inspect the toilet to pinpoint where the water is leaking from:
- Check Around the Base: Water pooling around the toilet’s base may indicate a faulty connection between the cistern and bowl.
- Inspect the Cistern: Look for cracks, drips, or water escaping from the cistern’s seams.
- Test the Flush Valve and Seal: Remove the cistern lid and flush the toilet while observing the valve and seal for leaks.
Thoroughly drying the area around the toilet before inspecting can help you track the water’s origin more effectively.
2. Tighten Loose Connections
One of the most straightforward fixes for a toilet leaking from cistern when flushed is tightening loose bolts or connections. Use a wrench or screwdriver to secure the cistern’s bolts to the bowl. Be careful not to overtighten, as this can crack the ceramic or plastic components.
3. Replace Worn-Out Washers or Seals
If the washers or seals inside the cistern are damaged, they must be replaced. Follow these steps:
- Turn Off the Water Supply: Locate the shut-off valve near the toilet and turn it clockwise to stop water flow.
- Empty the Cistern: Flush the toilet to drain the water from the cistern. Use a sponge or towel to remove any remaining water.
- Remove the Old Washers: Disconnect the cistern from the bowl and replace the damaged washers or seals with new ones.
- Reassemble the Toilet: Reattach the cistern to the bowl and tighten the bolts securely.
Always use high-quality replacement parts to ensure durability.
4. Fix a Faulty Overflow Valve
A faulty overflow valve can cause excess water to escape the cistern during a flush. To fix this:
- Adjust the Float: Check the float inside the cistern and adjust it to maintain the correct water level.
- Replace the Valve: If adjusting the float doesn’t work, replace the overflow valve with a compatible model.
5. Repair Cracks in the Cistern
Cracks in the cistern can lead to significant water loss. For minor cracks, apply a waterproof epoxy sealant to patch the damaged area. For extensive damage, consider replacing the cistern entirely.
6. Call a Professional Plumber
If your efforts don’t resolve the issue or the problem seems beyond your expertise, it’s time to call a licensed plumber. Ezy-Plumb specialises in toilet repairs and can efficiently diagnose and fix leaks, ensuring your toilet functions optimally.
Preventing Future Leaks
To avoid dealing with a toilet leaking from the cistern when flushed, consider these preventive measures:
- Schedule Regular Maintenance: Inspect your toilet annually to catch potential issues early.
- Use Quality Parts: Invest in high-quality components during repairs or replacements to extend your toilet’s lifespan.
- Check Water Pressure: Excessive water pressure can strain your toilet’s internal parts. Install a pressure regulator if necessary.
- Clean the Cistern: Regularly cleaning removes sediment and debris that can interfere with the seals and valves.
When to Replace Your Toilet
If your toilet frequently leaks or requires multiple repairs, replacing it might be more cost-effective. Modern toilets are designed for efficiency, using less water per flush while offering improved durability.
FAQs About Toilet Leaks
What causes a toilet to leak only when flushed?
Faulty seals, damaged connections, or issues with the overflow valve typically cause leaks during flushing.
Can I fix a leaking toilet myself?
Yes, many toilet leaks can be fixed with basic tools and replacement parts. However, complex issues may require professional assistance.
How much water can a leaking toilet waste?
A leaking toilet can waste up to hundreds of litres of water daily, depending on the severity of the leak.
Does home insurance cover a leaking toilet?
This depends on your insurance policy. Sudden and accidental damage might be covered, but leaks due to poor maintenance likely won’t be.
Dealing with a toilet leaking from cistern when flushed can be stressful, but addressing the issue promptly prevents further damage and conserves water. Trust Ezy-Plumb for expert plumbing services and reliable solutions to get the job done right.
