What To Do When Your Toilet Keeps Running

You hear it again: the hiss of water that will not stop. A running toilet wastes water and increases your bill. Homeowners who need plumbers in Jamestown, NY can turn to TJ’s Plumbing & Heating, Inc. This guide explains what to do when your toilet keeps running and when you may need professional help. 

What Causes a Toilet To Keep Running?

A toilet runs when water leaks from the toilet tank into the bowl or the tank keeps filling until water enters the overflow tube. A worn toilet flapper may not seal properly. Damage to the flush valve seat or a tangled or overly tight chain can cause the same problem. A misadjusted float or faulty fill valve can also keep water flowing.

A young child looking down into the open bowl of a white running toilet in a tiled bathroom.

Look at the Flapper and Flush Valve

Remove the tank lid and watch the flapper during a flush. It should lift, then settle evenly over the flush valve opening. If pressing it down stops the running, the flapper may be damaged or coated with buildup. Check that the chain lets it close freely.

Add a few drops of food coloring to the tank without flushing. If color reaches the bowl after 10 minutes, water is leaking past the flapper or flush valve seal. Flush afterward to prevent staining. Intermittent refilling, or ghost flushing, may signal a slow leak between flushes. 

Check the Fill Valve Before Replacing Toilet Parts 

Watch the water level as the tank refills. It should stop at the fill line, below the top of the overflow tube. If water enters the tube, adjust the float. Continued flow may indicate a faulty fill valve.

After identifying the faulty part, turn off the supply valve before removing or replacing it. Follow the manufacturer’s instructions, then test the toilet.

Replacement parts must match the toilet model. Take the old flapper to a hardware store or check the manufacturer’s parts guide. Following these cleaning and maintenance tips may help you spot wear or mineral buildup early.

When Should You Call a Licensed Plumber?

Call a plumber if adjustments fail or you cannot identify the faulty component. Professional help may also be appropriate when the flush valve needs replacement. If you notice water on the floor, shut off the supply valve and arrange service.

Trust TJ’s Plumbing & Heating, Inc. for Toilet Repair

TJ’s Plumbing & Heating, Inc. has served Western New York and Northwestern Pennsylvania since 2007. Call (716) 488-0066 for help diagnosing and repairing a running toilet in the Jamestown area. For other toilet problems, learn about the causes of toilet clogs.

Frequently Asked Questions

Why Does My Toilet Keep Running?

Your toilet may keep running because water leaks past the flapper or flows into the overflow tube. Knowing the source of the flow can help you identify the affected component. 

How Do I Stop a Toilet From Running?

Check whether the flapper seals and the chain moves freely. Then confirm that the water stops below the overflow tube. 

Is It Safe To Leave a Toilet Running?

A running toilet may remain usable, but it wastes water and can raise your bill. Address the problem promptly.

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TJ’s Plumbing & Heating, Inc.

TJ’s Plumbing & Heating, Inc. is an award-winning residential and commercial service provider offering professional plumbing, HVAC, and specialized underground excavation solutions across Western New York and Northwestern Pennsylvania. Founded in 2007, the company delivers reliable 24/7 emergency care, industry-leading technical expertise, and dedicated community support. Backed by consecutive regional awards, the certified team ensures absolute customer satisfaction, high-caliber workmanship, and long-term system reliability for every home they service.