April 12, 2025

Why Your Toilet Keeps Running (and How to Fix It)

The three most common causes of a running toilet — and which you can DIY.

Worn flapper

Most common cause. An inexpensive flapper and 10 minutes of your time solves it.

Failing fill valve

If the fill valve won't shut off cleanly, water runs to the overflow tube constantly. Also a DIY-friendly swap.

Bad flush valve seat

Rare, but if flapper replacement doesn't fix it, the plastic seat may be worn. A full internal rebuild is the fix.

If you'd rather have us handle it, we'll do the whole rebuild in under an hour with quality parts and a guarantee.

More plumbing tips

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