Why Does My Washer Smell Like Sewer?
A sewer smell from your washer often points to a drain or plumbing problem, such as a dry or blocked drain trap, a poorly fitted drain hose, or buildup inside the washer. Check when the odor appears and where it is strongest before cleaning or changing anything.
On this page (5 sections)
A sewer smell from your washer often points to a drain or plumbing issue, such as a dry or blocked trap, a poorly fitted drain hose, or buildup inside the washer. Note whether the odor comes from the drum, the drain, or both, and whether it appears during a wash or when the washer empties.
That pattern helps you choose the next step. Cleaning can help with washer residue, but it won't repair a plumbing problem.
Why does my washer smell like sewer when it drains?
If the odor is strongest while water drains, check the drain area and hose connection first. A trap that is dry, blocked, or not working as intended can let drain odors reach the laundry area.
Look for standing water, a slow drain, or a smell that lingers near the standpipe. If other sinks or drains smell too, the cause may be farther along the plumbing system.
Washer drain hoses need to be installed according to the washer instructions and local plumbing rules. A hose pushed too far into a standpipe or fitted incorrectly can cause drainage trouble, but don't pull out a built-in hose just to test it.
If you can't see a simple issue, contact a plumber. A washer cleaning tablet won't fix an odor coming from household plumbing.
Could residue inside the washer cause a sewer-like odor?
Yes. Detergent, lint, and damp residue can build up in the drum, dispenser, filter, or door seal and smell sour or foul.
A strong odor from the washer itself can seem sewer-like, even when the drain isn't the source.
Clean removable parts only as your manual directs. For a front-load washer, inspect the rubber seal and its folds; our guide to cleaning a washing machine rubber seal walks through that task.
Run the washer's cleaning cycle or another cycle recommended in the manual. Use a washer cleaner only as directed, and never mix cleaning products.
Affresh says its time-release tablet helps remove grime and soap scum from internal washer parts. Follow the package and washer instructions, especially if your appliance calls for a specific cycle or cleaner.
What can you check before calling for service?
Start with simple observations, not plumbing repairs. Check where the odor is strongest, whether the washer drains slowly, and whether the problem happens at other nearby drains.
- Smell near the open washer, the standpipe, and nearby floor or sink drains to narrow down the source.
- Check the drum, dispenser, and accessible seal for residue, lint, or standing water.
- Look at the visible drain hose for kinks or leaks, but don't disconnect it.
- Note whether the odor appears during draining, after a cycle, or even when the washer hasn't run.
- Check your washer manual before cleaning or running a maintenance cycle.
Keep the area ventilated while you investigate. If water leaks, backs up, or reaches an electrical outlet, stop using the washer and get qualified help.
A washer that shakes or shifts can strain nearby connections. If it moves during cycles, see how to level a washing machine before continuing to use it.
Should you clean the washer or call a plumber?
Clean the washer if the smell is strongest inside it and you find residue. Call a plumber if the odor is strongest at a drain, recurs during draining, or comes with slow drainage or gurgling.
The ACTIVE tablets are an option for readers who want a washer cleaner in a 24-tablet pack. ACTIVE describes them as compatible with front-load, top-load, standard, and HE washers; follow your appliance manual and the cleaner's directions.
Don't treat a cleaning cycle as proof that the plumbing is clear. If the odor remains after cleaning, or the drain symptoms continue, arrange an inspection instead of repeating cycles.
How can you help prevent washer odors from returning?
Remove damp laundry promptly and let the washer dry between loads. Follow the manual for leaving a door or lid open, since clearance and household safety matter.
For a compatible front-load washer, a door prop can hold the door ajar to let air circulate. The eHuangTools prop attaches magnetically, so it requires a magnetic metal surface; its maker says it isn't for stainless steel or plastic washers.
A door prop may help reduce dampness inside the washer, but it won't clear a drain odor. Check the washer's surface before choosing one, and keep the door from blocking a walkway.
Use the detergent type and amount recommended for your machine, and clean the dispenser and accessible filter as instructed. If odors return often alongside leaks, unusual noise, or poor draining, how long a washing machine should last can help you think through repair and replacement.
What should you do about a washer that smells like sewer?
If the odor is inside the washer, clean accessible areas and run the maintenance cycle your manual recommends. If it's strongest at a drain, appears during draining, or affects other fixtures, have a plumber inspect the trap, hose connection, and drain.
Use washer cleaner for residue, not as a plumbing fix. For regular upkeep, choose a cleaner that fits your washer instructions, and keep the door or lid open between loads only when the space is safe and the appliance allows it.
Frequently asked questions
Why does my washer smell like sewer when it drains?
A sewer smell that gets stronger while the washer drains can point to a drain connection, trap, or vent problem. Check for standing water or an odor around the standpipe, but don't pull out a built-in drain hose or dismantle plumbing.
Ask a plumber to inspect the drain if the odor persists.
Can a dirty washer smell like sewer?
Yes. Detergent residue, lint, and damp buildup can create a strong odor inside the washer, though a sewer-like smell can also come from plumbing.
Clean the gasket and detergent drawer, run a washer-cleaning cycle as your manual allows, and see whether the smell returns during draining.
Should I use bleach to remove a sewer smell from my washer?
Use only cleaners and amounts allowed by your washer manual. Never mix bleach with another cleaner, including vinegar or ammonia, because the combination can create dangerous fumes.
If the odor is strongest at the drain or returns after a cleaning cycle, investigate the plumbing instead.
When should I call a plumber about a washer sewer smell?
Call a plumber if the smell is strongest at the standpipe or nearby drain, several fixtures have sewer odor, drains gurgle, or the smell returns after washer cleaning. Stop using the washer if wastewater backs up or leaks, and avoid removing plumbing parts unless you know how they are fitted.
