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Fixtures | 4 min read

Why Does My Toilet Keep Running? Easy Fixes

A running toilet is usually a worn flapper, a bad fill valve or a water level set too high. Most fixes are quick.

By The Plumbing Co Team | Updated November 1, 2026
Why Does My Toilet Keep Running? Easy Fixes
Quick answer: A running toilet is usually a worn flapper, a bad fill valve or a water level set too high. Most fixes are quick.

A running toilet wastes water and raises your bill. The good news is that the cause is often simple.

Common causes - Worn flapper: the rubber seal no longer closes tightly - Bad fill valve: it does not shut off the water - Water level too high: water spills into the overflow tube - Chain problem: too short or too long

Quick test Add a few drops of food coloring to the tank. Wait 15 minutes without flushing. If color appears in the bowl, the flapper is leaking.

Easy fixes - Adjust the chain so there is a little slack - Lower the water level using the fill valve - Replace the flapper

When to call us Call if the toilet still runs, if it leaks at the base or if it clogs often. We fix running toilets and install new ones. See toilet repair and fixture installation. We work on TOTO, Kohler and American Standard toilets.

A small fix saves a lot A running toilet can waste a lot of water in a day. Fix it early.

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Common Questions: Why Does My Toilet Keep Running? Easy Fixes

How much water can a running toilet waste?

A lot over a day. It shows in your bill.

How much does a flapper cost?

Flappers are low-cost parts. We tell you the price before we start.

Can I replace the flapper myself?

Often yes. If it still runs, call us.

Why does water leak at the base?

A worn wax ring or loose bolts are common causes.

When should I replace the toilet?

If it is cracked, leaks at the bowl or clogs all the time.

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