How to Fix a Running Toilet
Quick Answer
Check the flapper, adjust the fill valve, or replace the float mechanism to stop water from continuously flowing into the bowl.
How to troubleshoot a Running Toilet
A running toilet can waste thousands of gallons of water per month. This guide helps you diagnose and fix the most common causes, including flapper, fill valve, and float issues.
Step-by-Step Fix
- Turn off the water supply to the toilet by turning the shut-off valve clockwise.
- Remove the toilet tank lid and set it aside carefully.
- Check the flapper at the bottom of the tank – if it is warped or worn, replace it.
- If the water level is too high, adjust the float arm or the fill valve screw to lower the water level.
- Ensure the chain connecting the flapper to the flush lever has about 1/2 inch of slack.
- Flush the toilet and listen for the water to stop running after the tank refills.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| Water runs continuously | Flapper not sealing or fill valve stuck | Replace the flapper or clean the fill valve diaphragm. |
| Intermittent running | Flapper chain too tight | Adjust the chain to provide 1/2 inch of slack. |
Frequently Asked Questions
How much water does a running toilet waste?
Up to 200 gallons per day, depending on the severity of the leak.
Can a running toilet fix itself?
No, it requires manual adjustment or part replacement.