A constantly running toilet is not only a source of frustration, but it can also unnecessarily increase your water bill. If you’ve ever heard the constant sound of water running in your home, you’ll be familiar with its annoyance. But more importantly, this problem is actually a sign of something wrong with your toilet’s flushing system.
In 2025, when there’s a lot of emphasis on saving water, it’s even more important to address these types of problems as soon as possible to prevent water waste. The first step is to find out why your toilet is constantly running. Fortunately, in most cases, the solution is simple and you can fix it yourself, without the help of a plumber.
This article will tell you about the most common reasons why a toilet keeps running, as well as step-by-step instructions on how to fix it.
The flapper valve is the rubber piece that keeps the hole between the bowls in the toilet tank closed. If this valve is not closed properly, water from the tank keeps flowing into the bowl, causing the toilet to keep running.
The fill valve is the part that controls the water level in the tank. If it is damaged or does not shut off the water in time, water will continue to flow even after the flush and the toilet will continue to run.
If the water level in the tank is too high, this water starts flowing into the overflow tube, causing the toilet to keep running.
Over time, parts inside the toilet, such as the flapper, fill valve, or float, become damaged or rusted, affecting their performance and preventing them from closing the water.
Before you start repairing, the most important step is to turn off the water supply. There is usually a valve behind the toilet, near the floor. Turn it clockwise to stop the water flow.
The flapper valve is often the main cause of a constantly flowing toilet. Check if this valve is closing properly. If it is old, cracked, or dirty, it can cause water leaks.
Solution: If the flapper is damaged, replace it. It is easily available in the market and is also inexpensive.
If the flapper is working properly, the next step is to inspect the fill valve. This is the part that controls the flow of water into and out of the tank.
Solution: If the fill valve is stuck or not working, you can adjust it or replace it completely. Some fill valves have a screw on the top that you can turn to control the water level. If the adjustment doesn’t fix the problem, install a new fill valve.
The water level in the toilet tank should be about an inch below the overflow tube. If the level is high, water will start to flow into the tube.
Solution: Lower the water level with the help of a float. Some toilets have a float arm that can be turned to lower the level, while others have a float ball that can be adjusted up and down. If the float is damaged, replace it too.
If water is constantly flowing into the overflow tube, it means the level is too high.
Solution: Adjust the float so that the water level is below the overflow tube.
If you notice rust or damage on any parts, such as the fill valve, flapper, or float, it means it’s time to replace them.
Solution: Buy quality parts from a nearby hardware store and replace them with old parts. Most toilets use standard parts that can be easily replaced by yourself.
Plumbing experts say that constantly flowing toilets are one of the most common household problems. “A constantly running toilet may seem like a minor problem, but it can waste hundreds of gallons of water every day,” says industry expert Greg Robbins. “Getting it fixed right away is not only a financial emergency, but also an environmental one.”
Robbins says most people can fix it themselves: “A simple change to the flapper or fill valve can eliminate the problem and save you the expense of a plumber.”
Stopping a toilet from running is not just a matter of cleanliness or comfort in the home, it’s also an environmental imperative. According to the U.S. Environmental Protection Agency (EPA), a constantly running toilet can waste up to 200 gallons of water every day. At a time when water conservation is being emphasized, it’s important to fix the problem quickly.
The financial impact can also be significant. If the problem isn’t addressed in a timely manner, your water bill can skyrocket. This highlights the importance of regular maintenance of a home’s plumbing system.
Q: Why is my toilet constantly flowing?
A: Common causes include a faulty flapper valve, a failed fill valve, or an incorrect water level. Corrosion of parts can also be a cause.
Q: How much water does a constantly flowing toilet waste?
A: Up to 200 gallons of water can be wasted in a day, which can significantly increase your bill.
Q:Can I fix a running toilet myself?
Yes, many homeowners can fix a running toilet themselves by replacing or adjusting the flapper valve, fill valve, or float. It’s a simple process that requires basic tools.
Q:What should I do if my toilet keeps running after replacing the flapper?
If the toilet continues to run after replacing the flapper, check the fill valve and adjust the water level. If necessary, replace the fill valve or adjust the float.
Q:How much does it cost to fix a running toilet?
If you hire a plumber, fixing a running toilet may cost anywhere from $100 to $300, depending on the complexity. However, most of the time, it can be fixed with parts costing only a few dollars.
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