Why is my toilet constantly running and how to fix it
Learn the reasons behind a running toilet and effective solutions to fix it with help from Kenosha Plumbing.

A constantly running toilet is not just an annoyance; it can also waste a significant amount of water and increase your utility bills. The most common reasons for this issue include a faulty flapper valve, a malfunctioning fill valve, or a misaligned float. Understanding these causes and how to address them can save you time and money.
This article will explore the reasons behind a running toilet, the tools you need to fix it, and when to call a professional plumber in Kenosha for assistance.
Why is my toilet constantly running?
A running toilet is a toilet that fails to shut off after flushing, causing water to continuously flow into the bowl. This issue can stem from several problems, primarily involving the toilet's internal components.
Common causes of a running toilet
Several factors can lead to a toilet that won't stop running:
- Faulty flapper valve: The flapper valve is responsible for sealing the tank and preventing water from flowing into the bowl. If it is worn out or misaligned, it may not create a proper seal, causing water to leak.
- Malfunctioning fill valve: The fill valve controls the water level in the tank. If it's stuck open or broken, it can lead to continuous water flow.
- Misaligned float: The float determines when the fill valve should close. If it's set too high, the water will overflow into the overflow tube, causing the toilet to run.
- Clogged overflow tube: If the overflow tube is clogged, water can back up and cause the toilet to run.
- Old toilet components: Over time, the internal parts of your toilet may wear out, leading to various problems, including a running toilet.
How to fix a running toilet
Fixing a running toilet can often be done without professional help. Here's a step-by-step guide:
- Turn off the water supply: Locate the shut-off valve behind the toilet and turn it clockwise to stop the water flow.
- Check the flapper valve: Remove the tank lid and inspect the flapper valve. If it's damaged or misaligned, replace or adjust it.
- Adjust the float: If the float is too high, adjust it so that it sits lower in the tank. This can often be done by bending the float arm.
- Inspect the fill valve: If the fill valve is malfunctioning, consider replacing it. This is a bit more complex, but many homeowners can manage it with the right tools.
- Test the toilet: Turn the water supply back on and flush the toilet to ensure it stops running.
What tools do I need to fix my toilet?
To fix a running toilet, you might need the following tools:
- Adjustable wrench
- Screwdriver
- Replacement parts (flapper valve, fill valve, float)
- Towels or sponge for cleanup
Common mistakes when fixing a running toilet
When attempting to fix a running toilet, homeowners often make a few common mistakes:
- Not turning off the water supply: Always turn off the water supply before starting repairs to avoid flooding.
- Ignoring wear and tear: Failing to replace worn parts can lead to recurring issues.
- Improper adjustments: Making incorrect adjustments to the float or fill valve can exacerbate the problem.
- Using the wrong parts: Ensure you are using the correct replacement parts for your specific toilet model.
When to call a professional
If your attempts to fix the running toilet fail, or if you encounter more serious issues such as leaks or extensive damage, it may be time to call a professional plumber in Kenosha. At Kenosha Plumbing, we offer expert assistance for all your plumbing needs, including toilet repairs.
Frequently Asked Questions
1. How much water does a running toilet waste? A running toilet can waste up to 200 gallons of water per day, significantly increasing your water bill.
2. Can I fix a running toilet myself? Yes, many homeowners can fix a running toilet with basic tools and replacement parts, following the steps outlined above.
3. How often should I replace toilet parts? It's advisable to replace toilet parts every 5 to 7 years, or sooner if you notice wear.
4. What are the signs I need a new toilet? Signs include frequent repairs, constant running, and visible cracks or leaks.
5. How much does it cost to repair a running toilet? Typical costs for toilet repairs in 2026 range from $50 to $200, depending on the issue and parts needed.
