What causes a toilet to leak from the base when flushing?

A toilet leaking at the base when you flush usually means the wax ring seal has failed. Loose or corroded closet bolts, a damaged flange, or a hairline crack in the bowl can also cause base leaks. Drain or sewer clogs can force water out at the base during a flush. If the toilet rocks, the seal is likely compromised. We fix these issues in Novato, Petaluma, and nearby.

Quick checks:

• Gently rock the toilet.
• Lightly snug the bolt caps.
• If water appears, stop use and shut the valve.

Updated: 2025-12-30

Need help in Rohnert Park, CA? Call (415) 862-8961 or book online.

"kellen gonzalez was professional, on time, fixed our toilet quickly!" — Zoe J.