Do you hear a constant drip in the bathroom or notice that the toilet cistern is losing water? This fault is very common and, although it seems minor, it can mean a large loss of water and a notable increase in your bill.
At Handyman in Madrid we explain how to detect and fix a leaking cistern, the most common reasons, and when it is convenient to call a professional.
How to know if the cistern is leaking?
Some clear symptoms of a leak in the toilet cistern are:
- You hear a constant drip even without flushing
- The toilet recharges itself every so often
- You notice that the water flows continuously into the bowl
- Unexpected increase in the water bill
In most cases, the problem lies in the internal mechanism of the cistern, and it can be solved without having to change the entire toilet.
Most common causes of a leaking cistern
- Worn gasket or flush valve
Water leaks from the cistern into the toilet even when full. - Misaligned or damaged float
It does not close the water inlet well, and it keeps entering without stopping. - Dirt or lime in the mechanism
Prevents the parts from closing correctly. - Deteriorated sealing rubbers
The internal joints lose elasticity and let water pass.
How to fix a leaking cistern (step by step)
Step 1: Close the toilet stopcock
Prevent more water from entering while working inside the cistern.
Step 2: Remove the cistern lid
Do it carefully. If it is built-in, it may require specific tools.
Step 3: Check the internal mechanism
Observe if the float is stuck, if the flush valve closes properly, or if there are signs of wear.
Step 4: Clean or replace the affected parts
- Use white vinegar or descaler to clean sediment.
- If a joint is damaged, replace it with a compatible one.
- If the float is broken or the mechanism is very deteriorated, it is better to replace the assembly.
Step 5: Reassemble everything and open the stopcock
Verify that there are no leaks and that the mechanism cuts off correctly when full.
And if it continues to leak?
If after checking and adjusting the mechanism the cistern continues to leak or does not cut well, it is best for a professional to check it.
At Handyman in Madrid we repair all types of cisterns: built-in, high tank, modern, or old. We work with all brands: Roca, Geberit, Gala, etc.
Why trust Handyman in Madrid?
- Urgent care on the same day
- Professionals with experience in plumbing and repairs
- Fixed prices without surprises
- Service throughout the Community of Madrid
Do you need help right now? Call us and we will fix it today.
Conclusion
A leaking cistern may seem unimportant, but if it is not repaired, it implies constant waste, moisture problems, and unnecessary expenses. With a little attention or the help of a professional handyman, you can have it solved in minutes.
At Handyman in Madrid we are available to help you with any domestic breakdown, from a cistern to a blind, a faucet, or a plug.




