A constantly running toilet isn’t just annoying—it can also waste hundreds of gallons of water and increase your utility bill. If you’re wondering why your toilet won’t stop running, there are a few common culprits. Fortunately, most of these issues are easy to diagnose and fix.
Common Causes of a Running Toilet
1. Faulty Flapper
The flapper is a rubber seal inside the tank that lifts when you flush, allowing water to flow into the bowl. If it doesn’t close properly, the water will continue running. Over time, flappers can warp, crack, or get covered in buildup, preventing a tight seal.
How to fix it:
- Turn off the water supply to the toilet.
- Remove the flapper and inspect it for damage.
- If it’s worn out, replace it with a new one (available at any hardware store).
- Ensure the flapper chain has a little slack—too much or too little can cause problems.
2. Malfunctioning Fill Valve
The fill valve controls the water flow into the tank. If it’s defective, it may continuously allow water to enter, preventing the toilet from shutting off properly.
How to fix it:
- Remove the tank lid and flush the toilet while observing the fill valve.
- If water keeps flowing after the tank is full, the valve may be worn out.
- Adjust the float to stop water at the correct level or replace the fill valve if needed.
3. Improperly Adjusted Float
The float controls the water level in the tank. If it’s set too high, excess water will continuously flow into the overflow tube, causing the toilet to run non-stop.
How to fix it:
- Find the float (either a ball float or a cup float) and adjust it downward.
- For a ball float, bend the metal arm slightly downward.
- For a cup float, slide it down the fill valve to reduce the water level.
4. Leaky Flush Valve or Overflow Tube Issues
The flush valve at the bottom of the tank can degrade over time, leading to leaks. Similarly, if the overflow tube is cracked or positioned too high, excess water may keep draining into the bowl.
How to fix it:
- Inspect the flush valve for cracks or wear.
- Ensure the overflow tube isn’t too high—water should stop below its opening.
- If necessary, replace the flush valve or adjust the overflow tube height.
When to Call a Plumber
If you’ve tried these fixes and your toilet is still running, it may be time to call a plumbing repair professional. A plumber can diagnose hidden issues, such as a damaged flush valve seat or high water pressure affecting your toilet’s components.
Stop Wasting Water and Save Money
A running toilet can waste up to 200 gallons of water per day, which adds up quickly on your water bill.
By troubleshooting and fixing the issue promptly, you’ll save water, money, and frustration.
Still having trouble? Contact Platinum Plumbing & Heating today for expert toilet repairs and reliable plumbing solutions!
