What is the most common cause of a running toilet leak?

The most common cause of a running toilet is a failing tank part, typically the flapper or the fill valve, which prevents a full seal or proper shutoff. Bell repairs these tank components and provides upfront options after on‑site diagnosis. If water appears on the floor, our team can confirm whether it’s a tank seal or wax seal issue using simple dye tests. We also handle replacements if repair isn’t cost‑effective in Denver and nearby areas.

Updated: 2025-12-30 00:00:00

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"He arrived promptly and was able to repair the toilet in only a few minutes." — Chet C.