How to Fix a Running Toilet: Step-by-Step DIY Guide

A running toilet can waste hundreds of gallons of water each month and increase your water bill. Luckily, fixing it is often simple and can be done with basic tools. This guide will walk you through the process step by step.

Step 1: Turn Off the Water Supply

Locate the shutoff valve behind your toilet and turn it clockwise to stop water flow. Flush the toilet to empty the tank.

Step 2: Inspect the Flapper

The flapper is a rubber seal at the bottom of the tank. If it is worn, warped, or misaligned, water will keep leaking into the bowl.

• Remove the old flapper
• Check for mineral buildup or cracks
• Replace with a new flapper if damaged

Step 3: Check the Chain and Handle

Ensure the chain connecting the handle to the flapper is not too loose or too tight. Adjust the chain so the flapper closes completely when the handle is released.

Step 4: Inspect the Fill Valve

The fill valve controls water coming into the tank. If it’s faulty, water may continuously flow.

• Check for leaks or corrosion
• Adjust the float arm to correct water level
• Replace the valve if it is broken

Step 5: Test Your Repairs

Turn the water supply back on and let the tank fill. Flush the toilet several times to ensure the flapper closes properly and the water stops at the correct level.

Tips & Tricks

• Use high-quality flappers and valves for longer life
• Regularly clean the tank to prevent mineral buildup
• If the toilet keeps running after multiple repairs, it may be time to call a professional plumber

Fixing a running toilet is one of the easiest and most rewarding plumbing DIY projects. Not only will you save water, but you will also save money on your bills while learning useful plumbing skills.