Troubleshooting a Second Floor Toilet That's Not Flushing Properly
If your second floor toilet is not flushing properly, you're likely experiencing a frustrating and unsanitary situation. Don't worry, you're not alone, and we're here to help. In this guide, we'll walk you through the most common reasons why your toilet might not be flushing correctly and provide step-by-step solutions to fix the issue.
Understanding Your Toilet's Flushing System
Before we dive into the solutions, it's essential to understand how your toilet's flushing system works. Most toilets use a tank and bowl system. When you flush, water from the tank flows into the bowl, pushing waste down the drain. If your toilet is not flushing properly, it's likely that there's an issue with the water flow or the flushing mechanism itself.
Common Reasons for a Toilet Not Flushing Properly
Now that we understand the basics of a toilet's flushing system, let's explore the most common reasons why your second floor toilet might not be flushing properly:

- Low water level in the tank
- Faulty flapper
- Clogged jet holes
- Worn-out fill valve
- Incorrect water pressure
- Blockage in the drain
How to Fix a Toilet That's Not Flushing Properly
Now that we've identified the possible causes, let's look at how to fix each issue:
Low Water Level in the Tank
If the water level in your toilet tank is too low, it might not be providing enough water to flush properly. Here's how to adjust the water level:
- Flush the toilet to lower the water level in the tank.
- Locate the float arm, which is connected to the float ball or cup. This is the part that rises and falls with the water level.
- Adjust the float arm so that the water level in the tank is about an inch below the top of the overflow tube.
- Flush the toilet again to test the new water level.
Faulty Flapper
The flapper is the rubber piece at the bottom of the tank that lifts to allow water to flow into the bowl. If it's worn out or not sealing properly, it might not be allowing enough water to flow into the bowl. Here's how to replace a faulty flapper:

- Turn off the water supply to the toilet by turning the valve behind the toilet clockwise.
- Flush the toilet to empty the tank.
- Remove the old flapper by disconnecting it from the flush chain.
- Install the new flapper, ensuring it's the correct size and that it seals properly.
- Reconnect the flush chain, ensuring it's not too tight or too loose.
- Turn the water supply back on and test the flush.
Clogged Jet Holes
The jet holes at the bottom of the toilet tank direct water into the bowl. If they're clogged with mineral deposits or other debris, they might not be allowing enough water to flow into the bowl. Here's how to clean the jet holes:
- Turn off the water supply to the toilet.
- Flush the toilet to empty the tank.
- Locate the jet holes at the bottom of the tank.
- Use a small brush or a piece of wire to clean out any debris from the jet holes.
- Turn the water supply back on and test the flush.
Worn-out Fill Valve
The fill valve is responsible for refilling the tank after a flush. If it's worn out, it might not be refilling the tank properly, leading to weak flushes. Here's how to replace a worn-out fill valve:
- Turn off the water supply to the toilet.
- Flush the toilet to empty the tank.
- Remove the old fill valve by disconnecting the water supply line and unscrewing the valve from the bottom of the tank.
- Install the new fill valve, ensuring it's the correct size and that it's properly connected to the water supply line.
- Turn the water supply back on and test the flush.
Incorrect Water Pressure
If the water pressure in your home is too low, it might not be providing enough water to flush the toilet properly. Here's how to check and adjust your water pressure:
- Purchase a water pressure gauge from a hardware store.
- Connect the gauge to an outdoor spigot or a sink faucet.
- Turn on the water and check the pressure. It should be between 40-80 PSI.
- If the pressure is too low, you might need to have a professional plumber check your home's water pressure system.
Blockage in the Drain
If the drain leading from your toilet is blocked, it might not be allowing waste to flow out of the bowl properly. Here's how to clear a blocked drain:
- Turn off the water supply to the toilet.
- Remove the toilet seat and lid.
- Use a toilet auger (also known as a plumber's snake) to clear the blockage. Insert the auger into the drain and feed it in until you feel resistance.
- Crank the auger to break up the blockage.
- Slowly pull the auger back out.
- Turn the water supply back on and test the flush.
When to Call a Professional Plumber
While many toilet issues can be fixed with a little DIY know-how, there are some situations where it's best to call a professional plumber. If you've tried the solutions above and your toilet is still not flushing properly, or if you suspect a more serious issue, don't hesitate to contact a licensed plumber. They have the tools and expertise to diagnose and fix even the most complex plumbing problems.
In the meantime, if you have any questions or need further assistance, please don't hesitate to contact us. We're always here to help!