Why does my toilet back up when my washing machine drains?

Author: Adalberto Armstrong I  |  Last update: Friday, March 14, 2025

When your washing machine drains, and there's a clog, the water path is shrunken or restricted. This forces air and water back through your pipes, searching for a place to escape. In this case, it's your toilet. Your vent pipe is blocked – Your drain and sewer pipes are connected to a vertical line called a vent pipe.

How to fix a toilet that overflows when the washer drains?

Check your pump filter to see if it's partially or totally obstructed. If so, remove the obstructions. If the pump is still running, you have another problem, but if the pump isn't running once it's drained, then that explains the overflow.

Why does my toilet bubble up when the washing machine drains?

It's caused by inadequate venting of your drain pipes, so air is being sucked into the drain through your toilet trap. The suction may also be pulling water out of the traps of your sinks and baths, which will allow noxious sewer gases into your home.

Why does my sewer back up when I use the washing machine?

Sometimes, water might back up in the kitchen sink while you're doing a load of laundry, or your bathtub will fill with water. Either case means that your main drain line is clogged. You need to call a professional to clear the drain for you.

How do I stop water from backing up in my toilet?

In most cases, this type of clog clears well with a plunger. Call a professional if standard plungers don't stop your toilet from backing up. Avoid risky DIY fixes like pouring chemicals into your toilet drain, using vinegar, or repeatedly attempting to flush the toilet.

How To Fix Toilets Gurgling When Washer Drains (Pipes Blockage - What Are The Solutions To Fix It?)

How to fix a toilet that keeps backing up?

Start with a Plunger

While a toilet plunger may not be a very high-tech solution, it's often the most effective and best way to unclog a toilet. In fact, most clogged toilets can usually be cleared with a simple plunger. Just make sure that you use the right kind of plunger as there are sink plungers as well.

How do I stop my toilet from backflowing?

Atmospheric Vacuum Breakers (AVB): Installed on individual fixtures, AVBs create a physical gap in the plumbing system to prevent backflow.

Why is my washing machine drain backing up into my toilet?

When your washing machine drains, and there's a clog, the water path is shrunken or restricted. This forces air and water back through your pipes, searching for a place to escape. In this case, it's your toilet. Your vent pipe is blocked – Your drain and sewer pipes are connected to a vertical line called a vent pipe.

How to unclog main drain line?

Your step-by-step guide: How to clear a main sewer line clog
  1. Step 1: Loosen the cap on the drain pipe. ...
  2. Step 2: Open the cap and let the buildup drain out. ...
  3. Step 3: Feed the auger cable into the drain pipe. ...
  4. Step 4: Run the auger until the clog is clear—and beyond. ...
  5. Step 5: Hose down the pipe and auger cable.

How do you fix a toilet sewer backup?

A basic plunger is usually all you need, though plungers with a flange on the bottom work better to unclog toilets. If a plunger fails to resolve the clog, a toilet auger is worth a try. In rare cases, you may need to shut off the water and remove a portion of the pipes to dislodge the blockage.

Why does my toilet water bubble when bathtub drains?

Do you hear a bubbly sound in the toilet when the bathtub drains? Homeowners often become surprised by the sound and panic as they wonder what's wrong. The issue is usually due to a clogged drain in the pipeline.

When my washer drains, my tub fills up.?

The most common reason this happens is due to a clogged drain. When you have a clogged drain it indicates there is a sewer issue that causes sewage backup through your bathtub drain.

Why does my toilet bubble when my washer is draining?

It means that there is a blockage somewhere in your plumbing system. When the washing machine drains, it creates a vacuum effect that causes the toilet to bubble and indicates a blockage in the system. It could be in the main sewer line or one of the secondary sewer lines.

How to know if the main sewer line is clogged?

When the sewer line that carries waste away from the house is blocked, you'll notice the four signs that follow.
  1. All Your Drains Reek. ...
  2. Your Drains Are Blocked or Slow-Moving. ...
  3. You Hear Loud Gurgling Sounds Coming From Your Pipes Throughout Your Home. ...
  4. You Have an Unnaturally Lush Landscape or a Smelly, Sunken Lawn.

How much does it cost to fix a clogged sewer line?

You will likely pay around $350 to $650 to have a plumber unclog a main sewer line unless you have complications like serious damage to the line.

Will Drano unclog a main sewer line?

With a clogged basement drain, pouring Drano or similar products down your sewer drain can actually damage your pipes or the glue holding them together, causing more sewer system problems in the future.

How do you unclog a main sewer line without a snake?

First, you can run hot water down the drain for 5 to 10 minutes to see if that helps break up the clog. If it doesn't, pour equal parts of vinegar and baking soda into a bowl and then pour that mixture down the drain. Let it sit for 15 minutes, and then run hot water down the drain.

How much does hydro jetting cost?

Hydro jetting costs $475 on average but range from $350 to $600. A plumber can give you a quote and get rid of your sewer clog. Having to keep your plumber on speed dial is no fun for any homeowner. If chronic sewer clogs are giving you issues, it might be time to call in the big guns.

Can a washing machine clog a toilet?

Don't let sewage backup cause damage to your home or your family. The main sewer drainpipe under your house connects all the drains in your home, such as sinks, tubs, showers, and toilets. Because the washing machine uses so much water, it can cause backups in all of your house's drains if you have a large clog.

Why does my sewer back up when I do laundry?

If water is backing up after a couple of loads, it probably means the backup is past the toilet and may be a clog in the main line. Your lines need cleared from a main line cleanout, which is a professional job for plumbing companies. Roto-Rooter can assist in this sewer cleaning.

Is a clogged main sewer line an emergency?

Once there is a blockage, you might quickly smell the foul odor or see water leaking. You certainly will know there is a problem. A sewer line clog is a very serious problem that can be considered a plumbing emergency.

How to fix a toilet that backs up?

Tried and True: Use a Plunger

The key here is to use the right kind of plunger for the job. You'll want to use a toilet plunger versus a sink plunger. These plungers have a bell shape with a cylindrical sleeve coming out of the bottom.

Where is the main sewer line in a house?

It can typically be found in the basement, crawl space or garage. You will want to search for a pipe that is approximately four inches in diameter with a screw cap on the top that has a notch or square knob at the top. Note that some homes have an indoor sewer cleanout point, while others may be located outdoors.

Why does my toilet keep bringing stuff back up?

Common reasons your toilets to keep backing up are: There's not enough water in the tank. There's a clog in the drain line. The main line for the house is clogged.

Previous article
How do you Privatise a bathroom window?
Next article
How common is asbestos in ceilings?