Basement Drain Backing Up When Washing Clothes? (Do This)

You head downstairs to switch the laundry, and instead of clean floors, you’re greeted by water bubbling up from the basement drain. 

Not exactly what you had in mind, right? 

This kind of backup is super common, especially when the washing machine is dumping a large amount of water into the plumbing all at once.

The good news is, it usually points to a clog or blockage somewhere in the system, and not a total plumbing disaster. 

In this post, we’ll show you exactly what to do if your basement drain is backing up when washing clothes.

#1 Stop Using Water For Now

First things first, when you notice that water is backing up in your basement drain, stop using water immediately. No more washing clothes, running the sink, or even taking showers if it’s all connected to the same drain system.

You don’t want to make the situation worse. If the drain is already clogged or slow, adding more water into the system will only make it overflow more. 

This is a good time to assess the situation and decide what steps to take next. 

If the backup is bad, you might even want to shut off the water supply to the washer temporarily.

Also Read: Can You Use Drano On Plastic Pipes?

#2 Check For Obvious Blockages

Once you’ve stopped the flow of water, it’s time to take a closer look. 

Check the drain itself for any visible obstructions. This could be anything from a large buildup of lint, debris, or maybe even something that got washed down the drain (like a sock or piece of fabric).

Sometimes, it’s just a simple case of something getting stuck in the drain trap.

If you spot something, you might be able to pull it out by hand or with a pair of pliers. Try to clear as much of the debris as you can. 

If that clears the backup, you’re all set! 

#3 Use Some Baking Soda And Vinegar

If you didn’t find anything right away, or if you cleared the visible stuff but the drain is still slow, the good old baking soda and vinegar trick can work wonders. 

It’s a non-toxic, easy way to break down grease and grime in your pipes.

Here’s how to do it:

1. Pour about half a cup of baking soda down the drain.
   
2. Follow it up with a cup of vinegar.
   
3. Cover the drain with a wet cloth to trap the fizzing action.
   
4. Let it sit for about 30 minutes to an hour. The chemical reaction between the two ingredients can help break up small blockages and buildup.

After waiting, run some hot water down the drain to flush it all out.

#4 Try A Plunger On The Basement Drain

Plungers aren’t just for toilets. They can be pretty effective when it comes to clogged drains, too. It can dislodge smaller blockages if they’re closer to the surface of the pipe.

Make sure to cover any overflow holes or vents around the drain with a cloth to create a good seal. 

Then, place the plunger over the drain and give it a few firm pushes. 

You might need to go at it for a bit to get things moving. Don’t get frustrated! Just keep plunging, and if there’s a blockage, it might break free.

If this works, congratulations – you’re done! If not, we’ve got some other tools to try.

#5 Snake The Drain

If plunging didn’t work, it might be time to bring in a drain snake. 

A plumbing snake is a long, flexible tool that you can push into your drain to break through clogs that are further down the pipe.

It sounds complicated, but it’s actually pretty simple to use. 

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Just slowly feed the snake into the drain, rotating it as you go. When you hit resistance, you’ve probably found the clog. Keep twisting to break it up, then pull the snake out slowly, bringing any gunk with it.

If you don’t own a snake, you can rent one from a hardware store for a few bucks. It’s way cheaper than an emergency plumber call.

#6 Check The Washer’s Discharge Hose And Standpipe

Sometimes the problem isn’t in the floor drain at all – it’s in the washer’s discharge setup. 

The standpipe (the vertical pipe your washer drains into) can get clogged with lint and detergent sludge. When that happens, water can overflow into the nearby floor drain instead of draining down the line.

Take the discharge hose out and inspect the standpipe with a flashlight. If it looks gunky, feed a small hand auger into it and clear the blockage. 

Also check the hose itself for buildup or kinks that might be slowing the flow.

This is a sneaky problem because it looks like the floor drain’s the issue when really the washer line is choking things up.

#7 Inspect The Main Sewer Line

If none of that works, or if you notice multiple fixtures backing up at once (like the basement drain plus a toilet or sink), there’s a good chance the problem’s in the main sewer line.

Tree roots, grease buildup, or a collapsed section of pipe can all cause water to back up when the washer drains. 

At this point, you’ll probably need professional help. 

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A plumber can run a power auger or use a camera to find the exact blockage.

It’s a bigger job, but catching it early saves you from a full-blown sewage backup, which is way worse than a few puddles from laundry water.

#8 Add A Drain Strainer And Lint Trap

Once you’ve cleared the clog and things are flowing smoothly again, take a couple of simple preventive steps to keep it that way:

• Place a mesh strainer over the basement floor drain.
  
• Attach a lint trap to the washer’s discharge hose.
  
• Clean both regularly so buildup doesn’t sneak up on you again

Lint, fabric, and small objects can build up over time and lead to slow drains. A strainer will catch most of that, and the lint trap will handle any stray fibers from the washer.

Both of these are cheap, easy to install, and can make a big difference.

It’s way easier to catch debris before it gets stuck than to deal with another backup later on.

Bottom Line

A basement drain backing up when the washer runs is annoying, but it doesn’t have to ruin your day. In many cases, it’s caused by a simple clog that you can clear yourself with a bit of patience and a few basic tools. 

Start with the easy stuff like checking for blockages, plunging, baking soda and vinegar, then work your way up to snaking and inspecting the standpipe.

If it turns out the main sewer line’s the issue, calling a plumber sooner rather than later will save you time, money, and a much bigger headache down the road.

And once everything’s running smoothly again, add those strainers and lint traps to prevent future backups.