Why Is My Toilet Running? Common Causes, Quick Fixes, and Expert Help from Trusted Plumbing and Heating

Last Updated: July 18, 2025Categories: ToiletBy 3.5 min read

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Many homeowners are all too familiar with the annoyance of a toilet that continues to run long after flushing. While a running toilet might seem like a minor inconvenience, it can actually waste hundreds of gallons of water every day and significantly increase utility bills.

Those living in the greater Puget Sound area can rely on local Renton plumber, Trusted Plumbing and Heating, for fast and reliable solutions to plumbing challenges, including running toilets.

running water in the toilet

Typical Reasons Toilets Keep Running

Worn or Faulty Flapper

  1. The flapper is a rubber valve at the bottom of the toilet tank that controls water release into the bowl. If the flapper is damaged, warped, or not creating a proper seal, water will continue to leak into the bowl.
  2. Homeowners can lift the tank lid and inspect the flapper. If it is deteriorated or not closing as it should, replacing it is usually quick and inexpensive.

Issues with the Chain

  1. The chain that connects the toilet handle to the flapper can be too tight or tangled, preventing the flapper from sealing correctly.
  2. Adjusting the chain so that there is a small amount of slack can often resolve this problem.

Faulty Fill Valve

  1. The fill valve controls how much water enters the tank after a flush. If it malfunctions, the water level can rise too high and spill into the overflow tube, causing the tank to refill constantly.
  2. Checking the water level inside the tank and adjusting the fill valve to keep the water about one inch below the top of the overflow tube can correct this issue. In some cases, replacing the fill valve may be necessary.

Float Problems

  1. The float determines when to shut off the fill valve. When set too high or if it malfunctions, the tank can overfill and keep running.
  2. Adjusting the float arm or turning the adjustment screw, depending on the toilet model, can solve the problem.

Cracked or Damaged Overflow Tube

  1. If there is a crack in the overflow tube or if it is poorly seated, water may continue running into the bowl.
  2. Damage to the overflow tube typically requires professional repair. The team at Trusted Plumbing and Heating carries out these repairs efficiently.

Why Promptly Fixing a Running Toilet Matters

Ignoring a running toilet can result in wasted water, higher utility bills, and potential water damage that could lead to even more costly repairs. Trusted Plumbing and Heating recommends homeowners address running toilets as soon as they notice them to avoid these consequences.

toilet tank parts diagram



How Trusted Plumbing and Heating Can Help

If standard troubleshooting steps do not stop the problem, or if any homeowner prefers to let a professional handle it, reaching out to Trusted Plumbing and Heating is the best next step. Their experienced technicians diagnose the cause quickly and provide affordable repairs across Renton, Kent, Bellevue, and the Seattle metro area. With same-day appointments and straightforward pricing, Trusted Plumbing and Heating helps customers avoid unpleasant surprises.

Find more information or book your service appointment by visiting the Trusted Plumbing and Heating website.

Frequently Asked Questions About Running Toilets

How much water does a running toilet waste?

A single running toilet can waste between 100 and 200 gallons of water each day, which can add up to thousands of gallons—and unnecessary costs—over a month.

Is a running toilet a plumbing emergency?

Although not as urgent as burst pipes, running toilets can significantly increase water bills and should be addressed quickly to prevent further complications.

How much does it cost to repair a running toilet?

Costs vary depending on the exact issue. Simple repairs such as replacing a flapper are usually inexpensive. For a clear estimate, homeowners can contact Trusted Plumbing and Heating directly through their website.

Can a running toilet cause water damage?

If left unresolved, a running toilet can cause leaks that may damage flooring or subflooring and even result in mold growth.

Residents in the Puget Sound region can resolve running toilet issues swiftly and affordably by scheduling service through the Trusted Plumbing and Heating website or by calling their team of professionals.

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About the author – John Barnes

John Barnes - author at Handyman tipsHandyman tips website was created by John Barnes from Phoenix, Arizona, in February 2014. John wanted to share with the public his 20 year experience in home improvement as a contractor and avid woodworker. John noticed that there aren’t many expert advice online and he wanted to help the public to get true expert tips and estimates. What started as a hobby soon became a full time job as Handyman tips website became very popular because of the quality of tips it provides. After a few years John has introduces a couple of new content creators into Handyman tips team but he is still the main content creator on Handyman tips website.

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