A clogged washing machine drain almost always sits in one of three places: the drain hose behind the machine, the standpipe it empties into, or the trap below that. Pull the machine out, unplug it, and work from the hose toward the wall. Most lint and soap clogs clear with a bucket, a flexible brush and twenty minutes. If the water comes back up elsewhere in the house, stop, because that is a bigger drain problem. This guide is part of our drain cleaning and clogs section.
How do I know my washing machine drain is clogged?
You have a clogged washer drain if the drum still holds water after the cycle, the standpipe gurgles or overflows during the drain stage, or the machine stops with a drain error. Slow drains build up over weeks: damp clothes at the end of a spin, a sour smell from the laundry area, or a puddle on the floor behind the machine.
Check two things before you pull anything apart. First, run a short drain-and-spin cycle and watch the standpipe. If water rises to the top and then slowly falls, the clog is in the standpipe or trap, not the hose. If the standpipe stays calm and the drum stays full, the clog is probably in the hose or the machine's own drain pump filter. Second, run the kitchen or bathroom sink. If that also drains slowly, the problem is shared and a plumber should look at it.
Front-loaders in particular have a small filter near the bottom front panel. Many drain errors are nothing more than a sock or coin sitting in it.
How do I unclog a washing machine drain hose?
Unplug the machine, pull it forward, and put towels and a shallow tray under the hose connection. Disconnect the hose from the machine and from the standpipe. Shake it out over a bucket, then push a flexible brush or a straightened wire hanger through it. Rinse with warm tap water, check for light through the hose, and reconnect it.
Hoses collect lint, hair, fabric fuzz and a gray film of detergent residue. If the hose is cracked, kinked, or stiff and discolored, replace it instead of cleaning it. A new drain hose is a cheap part sold at any hardware store, but match the length and the fitting to your machine.
Los Angeles water is on the hard side. LADWP's own scale calls anything over 7 grains per gallon hard, and its Water Quality FAQs list average hardness above that figure for the areas it reports, with the Eastern LA and Harbor supply the hardest. Hard water combines with soap to make a scum that coats the inside of drain hoses and traps. If you use a lot of detergent or fabric softener, that scum builds faster. Using the amount printed on the detergent label, not more, slows it down. If scale is a wider problem in your home, our page on removing hard water scale covers it.
Before you reconnect, check how the hose sits in the standpipe. It should enter only a few inches, with the opening loose. Pushing it deep and sealing the opening around it removes the air gap that stops water being siphoned out of the machine and can cause backups.
How do I clear the standpipe and trap behind the washer?
Clear the standpipe by feeding a drain auger, sometimes called a hand snake, down it until you meet resistance, then crank gently so the head catches the clog. Pull it back, wipe off the lint, and repeat. Flush with a few gallons of warm water. A trap below the wall may need a plumber.
Standpipes in older Los Angeles homes are often narrow. Many houses from the 1920s through the 1950s still have the original laundry line: a 1.5 inch pipe, sometimes galvanized steel that has rusted and narrowed inside, running to a cast iron or clay drain. A modern washer pumps out a lot of water in a burst, so a half-blocked narrow pipe overflows even when it is not fully stopped. That is why the standpipe can spill before it looks blocked.
Wear gloves and eye protection. Put a bucket under the trap only if it has a cleanout plug you can see, and open it slowly, because it holds standing water. Do not try to take apart a trap that is soldered, threaded to old steel, or set into a wall. Damaging it turns a clog into a leak.
A tip that matters: do not push a rigid rod or a sharp wire past the trap. Old pipes crack, and a repair inside a wall is far more expensive than the clog was.
Can I use chemical drain cleaner on a washer drain?
Avoid it. Chemical drain openers are made for sinks and tubs, not washer lines. They sit in the standpipe where a big surge of washer water can splash them back at you, they can soften old pipe, and they are dangerous if they meet bleach or another cleaner. A bucket, brush and snake do the same job safely.
If you already poured a chemical cleaner and it did not work, do not follow it with baking soda, vinegar, bleach or a plunger. Mixed cleaners can release toxic gas or throw hot liquid out of the drain. Open a window, keep the area clear, and call the plumber. If you got any on your skin or in your eyes, or breathed fumes, rinse with water and call Poison Control on 1-800-222-1222.
A simpler option for a mild slow drain is hot tap water. Pour a few gallons into the standpipe, not boiling, which can soften plastic. Then run an empty hot cycle with a washing machine cleaner or a cup of white vinegar in the drum. That clears surface film. It will not clear a solid lint plug.
Why does my washer drain keep clogging in an older Los Angeles home?
A washer drain that keeps clogging is usually a narrow or damaged pipe, a trap with too little slope, or a shared line that is partly blocked further down. Repeat clogs are not about how you use the machine. They tell you the pipe has lost capacity.
Common causes around Los Angeles:
- Galvanized steel laundry lines that rust and scale inside, so the opening keeps shrinking.
- Cast iron branches with rough, flaking walls that catch lint and grease.
- Long, shallow runs from a garage laundry area out to the main line, where flow is slow and lint settles.
- Roots or a belly in the private sewer lateral, which is the pipe from your house to the city sewer. LA Sanitation says tree roots and poured grease cause more than half of sewer backups, and that the property owner maintains and repairs the private lateral.
A telling sign is where the water goes. If the tub or a floor drain bubbles when the washer empties, or you hear gurgling in the toilet, the washer is pushing water into a line that cannot take it. That is a main line or lateral problem. For the nearby topic of a clogged toilet that backs up, the same warning applies.
When should I call a plumber for a washing machine drain?
Call a plumber if you cleared the hose and standpipe and the clog returned, if water backs up into other fixtures, if the standpipe is old galvanized pipe, or if the drain pipe is inside a wall. A plumber can run a larger cable, scope the line with a camera and tell you whether the pipe needs repair.
We will arrange a local plumber to come to you. You get a written quote before any work starts. See how a job runs for the steps, or ask for a quote on the quotes page.
A rough guide to drain cleaning prices: published Los Angeles figures put a single clogged drain at roughly $110 to $350, with deeper or camera-guided jobs above $400. Your quote depends on access, the line and the time of day. Our pages on the cost to unclog a sink and the plumber cost to unclog a toilet or drain break that down.
Stop DIY and call straight away if you smell sewage, see water coming out of floor drains, or the washer sits in a closet or garage where a leak would soak flooring. Turn off the washer's water supply valves and the machine's power while you wait. For the rest of our plumbing services, see the home page.
Common questions
How long does it take to unclog a washing machine drain?
A hose or standpipe clog usually takes 20 to 45 minutes to clear yourself, including moving the machine and cleaning up. A plumber with a cable machine often clears a laundry line in under an hour. A camera inspection or a damaged pipe adds time, and the plumber will say so before starting.
What should I ask before I hire someone to clear a washer drain?
Ask whether the quote covers the cable, the camera and the call-out, how the price changes if the clog is further down the line, and whether a permit is needed. Clearing a clog normally does not need one. Replacing or moving pipe often does, so ask what the plumber will check with the City of Los Angeles.
Does someone need to be at the property?
Yes, or someone adult you trust should be. The plumber needs access to the laundry area, the cleanout and sometimes the roof vent or yard. Move anything stored around the machine first. If you rent, tell your landlord before you hire anyone.
Can vinegar and baking soda unclog a washing machine drain?
They loosen light soap film but will not clear a lint plug, a hair mat or a narrowed pipe. A hot cycle with a cup of white vinegar in the drum is fine for mild odors. Never mix them with bleach or a commercial drain cleaner, and do not use them as a replacement for clearing the hose.
Why does my washer smell after I clear the drain?
A sour smell usually comes from detergent film and lint left in the hose or trap, or from a dry trap that lets sewer gas rise. Run a hot cycle with an empty drum, wipe the door seal on a front-loader, and pour a little water down the standpipe. If the smell stays, a plumber should check the trap and vent.