Lower your water bill with these straightforward steps to stop a running toilet.
Over time, a toilet can begin to run continuously or intermittently, resulting in increased water usage bills. The regular sound of running water can quickly get frustrating, causing many homeowners to wonder, "Why does my toilet keep running?" However, fixing this issue isn't overly complicated. Taking the time to troubleshoot the fill valve assembly and flush valve assembly will help you determine the exact cause of the problem. Top Entry Ball Valve
Make sure that if you need to replace any parts during this repair, you find compatible parts for your toilet. If you aren't experienced with DIY plumbing jobs, replacing some of the toilet parts might seem complicated, but by discovering how a toilet functions and the various factors that could be causing this issue, you can learn how to fix a running toilet.
The first step to fixing a running toilet is to learn how a toilet operates. Most people know that water fills the toilet tank, and when the toilet is flushed, this water gets emptied into the toilet bowl to force waste and wastewater into the drain line. However, the exact details of how this occurs are often unknown to the average individual.
Water flows through the water line and up into the toilet tank using the fill valve tube. The water is trapped in the tank by the flapper, a large gasket that sits at the bottom of the tank and is typically attached to the base of the flush valve.
As the tank fills with water, the float rod or float cup is forced to rise. When the float reaches a set level, the fill valve stops water flow into the tank. If the toilet has a faulty fill valve, the water might continue to rise until it spills into the overflow tube, which is intended to prevent accidental flooding.
With the toilet tank full, the toilet can be flushed with the lever or flush button, which pulls on a chain to lift the flapper. The water then flows out of the tank at a great enough force to keep the flapper open as the water rushes into the toilet bowl through the holes evenly spaced around the rim. Some toilets also have a secondary entry point called a siphon jet that increases flushing power.
Toilets are not overly complex, but several parts can cause your toilet to run, so it's necessary to troubleshoot the issue before you can resolve the problem. A running toilet is typically caused by the overflow tube, flush valve, or fill valve.
Check the water in the tank to determine if it is running into the overflow tube. If the water is running into the overflow tube, the water level might be too high, or the overflow tube might be too short for the toilet. The water level can be adjusted to resolve this issue, but the entire flush valve assembly must be replaced if the overflow tube is too short.
The running water is likely caused by the fill valve if the problem persists despite the overflow tube being the right height for the toilet and the water level being set about an inch below the top of the overflow tube.
If the water isn't running into the overflow tube, then it's usually the flush valve assembly that is causing the issue. The chain could be too short, preventing the flapper from fully closing, or the flapper might be warped, worn, or coated in grime, resulting in water flowing through the gap and into the tank.
A constantly running toilet isn't just an annoyance; it's also a costly waste of water that you will end up paying for on your next water bill. To resolve this problem, identify the part that is causing the issue and take the necessary measures outlined below.
The overflow tube is a part of the flush valve assembly. The overflow tube might be too short if the current flush valve assembly isn't compatible with the toilet. The tube could also have been cut too short during installation. If the overflow tube is too short, causing the water to run continuously, you'll need to replace the flush valve assembly with a compatible flush valve. However, if the overflow tube is the right height for the toilet, the water level or the fill valve might be the issue.
Ideally, the water level should be set to about an inch below the top of the overflow tube. If the water level is set higher than this, it's recommended to lower it by adjusting the float rod, float cup, or float ball. Float rods and float balls typically extend out from the side of the fill valve, while a float cup is a small cylinder attached directly to the fill valve where it slides up and down with the water level.
To adjust the water level, locate the screw that attaches the float to the fill valve and use a screwdriver or a set of channel locks to turn the screw about a quarter-turn counterclockwise. Make quarter-turn adjustments until the float is set to the desired water level. Keep in mind that if water is trapped inside the float, it will sit lower in the water, leaving the fill valve partially open. Correct this issue by replacing the float.
If the water continues running until it flows into the overflow tube, regardless of the float level, then the issue is probably caused by a faulty fill valve. However, if the water is continuously running but not flowing into the overflow tube, then the flush valve might be the problem.
The flush valve chain is intended to lift the flapper in response to the toilet lever or flush button being used. If the flush valve chain is too short, the flapper can't close properly, resulting in a steady stream of water constantly flowing through the toilet. Similarly, if the chain is too long, it can get trapped underneath the flapper, preventing it from closing.
Check the flush valve chain to make sure it's the right length to allow the flapper to fully close without extra links of chain that could become an obstruction. You can shorten the chain by removing several links until it's the right length, but if the chain is too short, you might need to get a replacement flush valve chain to resolve the problem.
The flapper is typically made of rubber and can become warped, worn, or coated in grime over time. Inspect the flapper for signs of significant wear, warping, or grime. If the flapper is damaged, replace it with a new flapper. If it's just dirt, clean the flapper with warm water and vinegar.
After inspecting the overflow tube, the water level setting, the length of the flush valve chain, and the current state of the flapper, you might find that the flush valve assembly causes the problem. Purchase a compatible flush valve assembly online or from a local home improvement store to ensure the new overflow tube will be tall enough for the toilet tank.
Start the replacement process by turning off the water to the toilet using the isolation valve on the water inlet line. Next, flush the toilet to drain the water and use a cloth, towel, or sponge to remove any remaining water from the tank. Disconnect the water supply to the tank using a set of channel locks.
You must detach the toilet tank from the toilet bowl to remove the old flush valve assembly. Remove the tank-to-bowl bolts and carefully lift the tank off the toilet to access the toilet-to-bowl gasket. Loosen the flush valve nut and remove the old flush valve assembly, setting it aside in a nearby sink or bucket.
Install the new flush valve in its place, then tighten the flush valve nut and replace the tank-to-bowl gasket before putting the tank back into position. Secure the tank-to-bowl bolts and reconnect the water supply to the toilet. Turn the water back on and allow the tank to fill up. While it's filling, take the time to check for any leaks at the base of the tank. If the water continues running after the tank is full, the tank-to-bowl gasket or the flapper might be improperly installed.
If the overflow tube is the right height for the toilet and the water level is set about an inch below the overflow tube but continues to flow into the overflow tube, the issue is likely the fill valve. Replacing the fill valve isn't as difficult as dealing with a faulty flush valve.
Turn off the water to the toilet using the isolation valve on the water inlet line, then flush the toilet to empty the tank. Use a cloth, towel, or sponge to soak up any remaining water, then remove the water supply line with a set of channel locks. Unscrew the locking nut on the bottom of the tank to loosen the fill valve assembly.
Remove the old fill valve assembly, set it aside in a sink or bucket, and install the new one. Adjust the height of the fill valve and float to ensure it sits at the correct level for the toilet. Secure the fill valve assembly with the locking nut on the bottom of the tank. With the new fill valve in place, reattach the water supply line and turn the water back on. Check the bottom of the tank and the water supply line for leaks as the tank fills with water. If the repair is successful, the water will stop flowing into the tank when the float reaches the set level instead of continuing to fill until it spills into the overflow tube.
Even if you have some experience with DIY tasks, like woodworking or landscaping, you might not fully understand the various parts of a toilet and how they work together to create a functional fixture for waste management. If the steps above seem too complex or you are nervous about attempting a plumbing repair, contact a professional plumber to fix the issue. Trained professionals might cost more, but they ensure that the work is done quickly, safely, and effectively so you don't have to worry about potential problems, like cutting the overflow tube too short or a leaking toilet tank.
More modern toilets have a fill valve instead of a ball float, which is easier to fix. To fix a toilet with a fill valve, examine the valve and corresponding float cup to see if either (or both) are installed correctly. If they are, and the issue persists, you'll likely need to replace the fill valve and the float cup to stop the tank from overflowing.
If your toilet has a button flush (also known as a dual flush toilet) and is continuously running, you want to start by cleaning or replacing the seal. If the issue continues—or if the water level is high and nearly overflowing—you may need to replace the fill valve.
Fixing a running toilet is typically inexpensive, sometimes costing under $50. However, costs can increase significantly if you need to hire a plumber—or if your running toilet is the sign of a larger plumbing issue. Depending on the complexity of the fix, a plumber may charge $75 to $400 to repair a running toilet.
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