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How to Fix a Leaking Toilet (Step-by-Step)

How to Fix a Leaking Toilet (Step-by-Step)

A leaking toilet can waste a lot of water and cause floor damage if it’s leaking at the base. The fix depends on where the leak is coming from. Use this guide to diagnose the source and handle the most common repairs safely.

Before you start (quick safety)

  • Turn off the toilet’s shutoff valve (behind the toilet).

  • Flush once to empty the tank as much as possible.

  • Keep towels nearby and use a small bucket if you disconnect any lines.

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Step 1: Identify where the leak is

Dry the area and watch closely after flushing. Most toilet leaks come from one of these places:

  • Tank-to-bowl connection (water dripping between tank and bowl)

  • Supply line or shutoff valve (drips behind the toilet)

  • Fill valve or flush valve inside the tank (water running or leaking into bowl)

  • Base of the toilet (water on floor around the base)

Step 2: Fix common toilet leaks

A) Running toilet (leaking into the bowl)

If you hear the toilet refilling often, the flapper may not be sealing. Turn off the water, remove the tank lid, and check the flapper for warping or buildup. Replacing the flapper is usually a quick, low-cost fix.

B) Leak at the supply line or shutoff valve

With the water OFF, snug the connection nuts slightly (don’t over-tighten). If the flexible supply line is old or corroded, replacing it is often the safest option.

C) Leak between tank and bowl

This can be caused by a worn tank-to-bowl gasket or loose bolts. Turn off water, drain the tank, and check the bolts for tightness. If the gasket is deteriorated, it should be replaced.

D) Leak at the base (wax ring issue)

Water around the base after flushing can mean the wax ring seal has failed or the toilet is rocking. This repair usually requires removing and resetting the toilet. If you’re not comfortable lifting the toilet or you suspect floor damage, call a plumber.

When to call a plumber

  • The toilet leaks at the base (wax ring) or the floor feels soft

  • You can’t shut off the water fully at the valve

  • There’s corrosion, cracked porcelain, or repeated leaks after repairs

Find a plumber on Ready Jan

If you’d rather have a pro handle it, Ready Jan helps you find and compare local plumbers by service area and specialty. Send a job request with your issue, location, and photos (if you have them) to get faster, more accurate responses.ReadyJan.com



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