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Toilet Keeps Running? 5 Causes and How a Plumber Fixes It

Toilet keeps running and wasting water? Learn the 5 most common causes — flapper, fill valve, float, chain and flush valve — and when to call a plumber in Pennsylvania.

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By Patrick Chase Plumbing Co. · Updated 2026-11-08 · Topic: toilet keeps running

Why a running toilet matters

A toilet that keeps running can waste 200 gallons of water a day — that is thousands of gallons a month showing up on your water bill. It is also one of the most common calls our plumbers get across Pennsylvania, and in most cases it is a quick, affordable fix.

1. Worn flapper

The flapper is the rubber seal at the bottom of the tank. Over time it warps, cracks or gets coated with mineral deposits so it no longer seals. Water leaks into the bowl, the tank refills, and the cycle repeats. Add a few drops of food coloring to the tank; if color appears in the bowl without flushing, your flapper is leaking.

2. Float set too high

If the float is set too high, water rises above the overflow tube and drains continuously. Adjusting the float screw or clip so the water sits about an inch below the top of the overflow tube usually solves it.

3. Faulty fill valve

A fill valve that does not shut off completely will keep trickling water into the tank. You may hear a faint hiss. Fill valves wear out after 5–7 years and are inexpensive to replace.

4. Chain problems

A chain that is too long can get caught under the flapper; one that is too short holds the flapper open. Either way, water keeps running.

5. Cracked flush valve or overflow tube

A cracked overflow tube or a corroded flush valve seat lets water bypass the flapper entirely. This requires removing the tank and is best left to a professional.

When to call a plumber

If a new flapper and float adjustment do not stop the running, or if you see water on the floor around the toilet, it is time to call. Our toilet repair team fixes running toilets across Pennsylvania the same day, and if the toilet is old and inefficient we can install a new water-saving model.

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