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Fixing a Running Toilet

YP Editors

If you hear the sound of water running long after the toilet has been flushed, your toilet is running. A running toilet will increase your water bill. If left unchecked, it can eventually cause flooding of your home's septic tank.

Most running toilets are caused by a defective flapper. Correcting this issue is usually fairly simple, and can often be handled without the help of a plumber.

Identifying the Cause of a Running Toilet


Located inside the toilet's tank, the flapper is a rubber stopper that lifts to allow water to flow into the bowl. A flapper needs to seal completely to prevent water from entering the bowl. Old or faulty flappers might not seal as tightly as necessary.

Test to see if a flapper is at the root of the problem by pushing down on it to tighten the seal. If the toilet immediately stops running when the flapper's seal is tightened in this way, the flapper is the problem.

In the case of a faulty flapper, purchase a replacement at your local hardware or home improvement store. Flappers come in different shapes and sizes, so take a photo of the current flapper and bring it to the store so you can ensure you get the identical size. Toilet flappers cost between $3 and $35.

Replacing a Faulty Flapper


Follow the steps listed below to replace your toilet's flapper.
  1. Cut off the toilet's water supply. Before replacing the flapper, cut off the toilet's water supply. There should be a shutoff valve located beneath the tank.
  2. Drain the bowl. Next, flush the toilet to drain all water from the bowl.
  3. Remove the flapper. Follow up by removing the toilet flapper. As you do so, take care to observe how the flapper is attached to the bottom of the tank, since you'll need to duplicate this assembly when installing the replacement flapper.
  4. Follow the instructions provided with the replacement flapper. There are many different types of flappers on the market, and they're all installed differently. Follow the instructions that come with the new flapper. In some cases, you'll have to add or remove links from the flapper's chain. Take care to ensure that the chain is an ideal length. If it's too long, you'll have to jiggle the handle to get the bowl to refill. If it's too short, the toilet might not flush completely.

Hiring a Plumber to Fix a Running Toilet


Though a defective flapper is often the cause of a running toilet, other factors can trigger this problem. If you suspect another cause, hire a plumber. A good plumber will be able to quickly diagnose the problem, and fix a running toilet in as little as an hour or two.

Choose a licensed plumber, as they have the specific training and skills to do the work. It's also essential to select a plumber who's bonded and insured, since this will protect you from liability if there are mishaps on the job.

Hiring a plumber to fix a running toilet typically costs between $50 and $200.
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