A toilet that won’t stop running is more than just an annoyance—it can waste hundreds of gallons of water each month and increase your utility bills. Understanding why this happens and how to fix it can save you both money and frustration. Here are the most common causes of a running toilet and the steps homeowners can take to stop it.

1. Faulty Flapper

The flapper is the rubber valve at the bottom of your toilet tank that opens to let water into the bowl. Over time, flappers can warp, crack, or become coated with mineral deposits, preventing a tight seal. When the flapper doesn’t close properly, water continually leaks from the tank into the bowl.

Solution:
Inspect the flapper for damage and replace it if necessary. Most hardware stores sell universal flappers that fit standard toilets. Replacing a flapper is a simple, low-cost fix that often solves the running toilet problem.

2. Misaligned or Broken Chain

The chain connects the toilet handle to the flapper. If the chain is too short, too long, or tangled, the flapper may not fully close, allowing water to keep running.

Solution:
Adjust the chain length so it has a little slack when the flapper is closed. Ensure it isn’t catching on other parts inside the tank.

3. Malfunctioning Fill Valve

The fill valve controls the water flow into the toilet tank. If it’s not shutting off properly, the tank will continue to fill and overflow into the overflow tube. Sediment buildup or wear and tear can cause fill valve issues.

Solution:
Check the fill valve for signs of corrosion or mineral deposits. Cleaning or replacing the valve usually stops the problem and restores proper tank function.

4. Float Problems

The float rises with the water level and signals the fill valve to stop once the tank is full. If the float is set too high, water will spill into the overflow tube, causing continuous running. Floats can also stick due to corrosion or buildup.

Solution:
Adjust the float to the proper water level, or replace a damaged float. Proper adjustment ensures the fill valve shuts off at the correct time.

5. Leaks Around the Overflow Tube

If water constantly flows into the overflow tube, it may indicate cracks or misalignment. This can happen with older toilets or as a result of improper installation.

Solution:
Inspect the overflow tube for damage and make adjustments or replacements as needed. Professional inspection is recommended if you notice persistent leaks.

Stop Water Waste and Protect Your Home

A running toilet may seem minor, but it can waste significant water and increase your monthly bills. Many of the causes—like a worn flapper, chain issues, or float problems—are simple to fix, but some cases may require professional attention.

For reliable inspection, maintenance, and repairs, William J. Guarini Inc. is here to help. Contact William J. Guarini Inc. at (201) 754-1095 to stop your toilet from running and keep your home’s plumbing in top condition.