Few household problems are as frustrating as a running toilet. Not only is the constant sound annoying, but it can waste hundreds of litres of water each day, which adds up on your bill. If you’ve noticed water running continuously or a leak from the toilet tank, don’t worry you’re not alone. The good news is, in many cases, you can troubleshoot the issue yourself. And if it’s more serious, it’s always smart to call a professional plumber.
In this guide, we’ll walk you through how to stop a running toilet tank, what to do if your toilet water tank is leaking, and when it’s time to get expert help.
Common Reasons for a Running Toilet Tank
Before you can fix the problem, it helps to understand why it’s happening. A toilet tank can run or leak for several reasons:
Faulty flapper – The flapper is a rubber seal inside your toilet tank. If it’s worn or not sealing properly, water will continuously leak into the bowl.
Float problems – The float controls the water level in the tank. If it’s set too high, water will spill into the overflow tube, causing the toilet to keep running.
Loose or damaged fill valve – This valve controls the water entering your tank. A faulty one can result in a never-ending flow of water.
Cracks or leaks in the toilet tank – If you notice a toilet tank leaking from the sides or bottom, it might be a structural problem that needs immediate attention.
Worn-out washers or bolts – Sometimes, leaks come from where the tank connects to the bowl, especially if washers or bolts have degraded over time.
How to Stop a Running Toilet Tank
1. Check the Flapper
Lift the lid of your toilet water tank and take a look inside.
If the flapper looks warped or doesn’t seal properly, it’s probably the culprit.
You can replace the flapper yourself; they’re inexpensive and available at most hardware stores.
Tip: Before replacing the flapper, try cleaning it. Sometimes, mineral buildup prevents it from sealing properly.
2. Adjust the Float
If the float is too high, water will continuously spill into the overflow tube:
Turn off the water supply to the toilet.
Adjust the float arm or the float cup (depending on the type of toilet) so the water shuts off about an inch below the overflow tube.
3. Inspect the Fill Valve
A noisy or constantly running tank can also be caused by a faulty fill valve:
Turn off the water supply.
Remove the old fill valve and install a new one if necessary.
Turn the water back on and test the toilet.
If this doesn’t stop the running, it’s a sign you might have a bigger issue.
4. Look for Leaks from the Toilet Tank
If your toilet leaking at the tank is obvious water pooling around the base or dripping from the bolts tighten the bolts connecting the tank to the bowl.
If tightening doesn’t help, you may need to replace the rubber washers or gaskets.
For cracks in the tank itself, it’s best to call a professional. Trying to repair a cracked tank yourself can lead to more damage.
When to Call a Plumber
While many running toilet problems are easy to fix, some require a professional touch. You should call a plumber if:
Your toilet tank leaking involves visible cracks.
You’ve replaced parts (flapper, fill valve) and the toilet still won’t stop running.
Water is leaking from multiple places around the toilet.
You’re uncomfortable doing the repairs yourself.
A professional will quickly identify the problem and ensure everything is watertight. Plus, they can check for hidden issues like corrosion or poor seals that you might not spot.
Why You Shouldn’t Ignore a Running Toilet
A running toilet may seem like a small issue, but over time it can lead to:
High water bills – Even a small leak can waste thousands of litres of water every month.
Damage to your bathroom floor – Leaks from the toilet tank can damage flooring and even lead to mould growth.
Bigger plumbing problems – What starts as a simple running toilet can turn into a full-blown leak if left unattended.
Final Thoughts
Knowing how to stop a running toilet tank can save you time, water, and money. Simple fixes like replacing the flapper or adjusting the float are often enough. But if you spot a toilet tank leaking or your toilet leaking at the tank even after trying these steps, it’s time to bring in the professionals.
Don’t ignore the signs get it fixed today and enjoy a quieter, leak-free bathroom!
Need help fixing a running toilet?
Don’t let a small leak from your toilet tank turn into a big problem. Our expert plumbers can quickly diagnose and repair your toilet, saving you water, money and stress. Call us today for fast, professional service you can trust!
