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 has failed. Loose closet bolts, a cracked or uneven flange, or an unlevel toilet can also break the seal. A hairline crack in the bowl or a clogged drain forcing water past the wax can cause seepage. Sometimes a dripping supply line only looks like a base leak. We replace wax rings/flanges and reset toilets in Appleton and nearby areas.

Quick checks:

• Gently tighten the two closet bolts.
• Look for water under the tank and at the shutoff.
• If leaking persists, the wax ring likely needs replacing.

Updated: 2025-12-28

Need help in Appleton, WI? Call (920) 706-4606 or book online.