Dublin, Ireland



How to Fix a Running Toilet: Step-by-Step Guide

Materials needed:

Adjustable wrench Flathead screwdriver Replacement toilet flapper (optional)


Turn off the water supply valve. Locate the valve behind the toilet and turn it clockwise until it stops. This will shut off the water supply to the toilet.

Remove the toilet tank lid. Place the lid in a safe location where it won't break or get damaged.

Check the flapper. The flapper is a rubber valve at the bottom of the tank that allows water to flow from the tank into the bowl when you flush. Check to see if the flapper is properly seated and not warped, cracked or damaged. If it is, replace the flapper.

Adjust the flapper chain. If the flapper appears to be in good condition, check the chain that connects it to the toilet handle. If the chain is too long or too short, it can cause the flapper to not seal properly and the toilet will continue to run. Adjust the chain to ensure it has just enough slack to allow the flapper to close fully.

Clean the flapper and flush valve. Sometimes mineral deposits or debris can build up on the flapper or flush valve, preventing the flapper from sealing properly. Use a soft-bristled brush or cloth to clean any buildup on the flapper and flush valve.

Replace the flapper. If the flapper is damaged or doesn't seal properly after cleaning, replace it with a new one. Follow the manufacturer's instructions for installing the new flapper.

Turn the water supply back on. Once the flapper has been fixed or replaced, turn the water supply valve back on by turning it counterclockwise until it stops. Wait for the tank to fill with water, then flush the toilet to test the repair.

If these steps do not solve the problem, or you are not comfortable with DIY repairs, it may be time to call a professional plumber.

Emergency 24/7


Emergency Plumbing Service

24 Hours 7 Days a Week

Book For A Service