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

A toilet leaking from the base when you flush usually means the wax ring seal has failed or the closet bolts are loose. Loose connections at the base or tank can also let water escape during a flush. If the toilet isn’t firmly set on the floor, the seal can break and leak. These are common repairs we handle in St. Charles and Glendale Heights, including wax-ring replacement, bolt tightening, and tank-to-bowl fixes.

Quick checks:

• See if the toilet rocks.
• Gently snug the closet bolt caps.
• Shut off water if leaking persists.

Updated: 2025-12-24

Need help in St. Charles, IL? Call (331) 294-8710 or book online.

Internal link: See our plumbing and toilet repair services page. https://summersphc.com/glendale-heights/