Why Does My Toilet Keep Running?
Understand the common causes of a constantly running toilet, safe checks you can make, likely costs, and when to call a plumber.
What this usually means
A toilet that keeps running usually has a tank component that is not sealing or shutting off correctly. The most common causes are a worn flapper, a tight chain, or a fill valve or float that needs adjustment.
Likely causes
Worn or misaligned flapperThe rubber seal at the tank bottom can become stiff, dirty, or off-centre, allowing water to leak into the bowl.
Fill valve or float adjustmentIf gently lifting the float stops the water, the fill control is the stronger candidate.
Flush chain problemA caught or overly tight chain can hold the flapper slightly open.
Water level set too highWater flowing into the open overflow tube points to a level or fill-valve issue.
Safe checks you can make
- Listen and look for continuous water entering the bowl.
- Remove only the tank lid and set it safely on a towel.
- Check whether the chain has a little slack.
- Compare the tank water line with the top of the overflow tube.
When to call a professional
Call a plumber if the shutoff valve is stuck, the toilet is overflowing, the tank is cracked, or accessible adjustments do not stop the flow.
Common questions
Is a running toilet an emergency?
Usually it is low urgency, but it wastes water. An overflowing toilet or water reaching the floor needs immediate attention.
How much does a running-toilet repair cost?
A basic DIY flapper or fill valve often costs about $8–$35. A typical professional visit may be roughly $120–$250, varying by location and complexity.