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

There isn’t one single “most common” cause we publish, because a running toilet can stem from different internal parts. Our plumber will assess how your toilet’s components work together, then repair or replace what’s needed with an up-front price and a written guarantee. If it runs constantly or won’t flush completely, we diagnose, unclog, or replace parts on-site. 24/7 emergency help is available in Seattle, Everett, and nearby.

• Turn off the toilet’s shutoff valve if water is wasting.
• Avoid repeated flushes if the bowl rises.
• Book an assessment so a technician can confirm the fix.

Updated: 2025-12-24

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