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Quick answer
A washer that smells like sewage is often due to a backed-up drain or a broken water pump. Turn off the power and water, then check the drain for clogs. If the smell persists, inspect the pump and consider replacing it if damaged.
Confirm the symptom
- Washer emits a strong sewage odor during or after cycles
- Odor is strongest near the drain or pump area
- Smell worsens after the washer sits idle for a day or more
- Drain water has a foul smell even when not in use
Tools and prep
- Screwdriver set (flathead and Phillips)
- Rubber gloves
- Bucket or large container
- Plumber's snake or drain auger
- Flashlight
- Clean cloth or paper towels
- Turn off power at the circuit breaker for safety
- Shut off water supply valves before starting
Step-by-step troubleshooting
- Check Drain Hose for ClogsDo: Locate the drain hose at the back of the washer and disconnect it from the wall. Use a flashlight to inspect the hose for visible clogs or debris.Observe: Clogs or standing water with a foul odorMeans: A clogged drain is likely causing the sewage smell.Next: Use a plumber's snake to clear the clog and flush the hose with water.
- Inspect the Pump FilterDo: Find the pump filter (usually at the front or bottom of the washer) and remove it using a screwdriver. Check for debris, mold, or sludge.Observe: Mold, sludge, or debris in the filterMeans: The pump filter is contaminated and needs cleaning or replacement.Next: Clean the filter with a mixture of water and mild detergent. Reinstall it and run a test cycle.
- Check for Standing WaterDo: Look inside the drum and under the washer for any standing water. Use a cloth or towel to wipe up any moisture.Observe: Standing water with a foul odorMeans: Standing water is likely the source of the sewage smell.Next: Dry the area thoroughly and ensure the drain is clear to prevent future buildup.
- Test the Drain PumpDo: Reconnect the power and run a drain cycle. Listen for unusual noises from the pump and check for proper drainage.Observe: Pump makes loud noises or fails to drain waterMeans: The drain pump may be damaged or clogged.Next: If the pump is faulty, replace it following the manufacturer's instructions.
- Clean the Washer TubDo: Run a hot water cycle with a mixture of vinegar and baking soda to clean the interior and eliminate odors.Observe: Odor reduces or disappears after the cycleMeans: Mold or mildew buildup was contributing to the sewage smell.Next: If the odor persists, consider professional cleaning or inspection.
- Inspect the Drain Line for LeaksDo: Check the drain hose and connections for cracks, leaks, or loose fittings.Observe: Visible cracks or leaks in the hoseMeans: A damaged drain hose could be allowing sewage odors to escape.Next: Replace the damaged hose and ensure all connections are secure.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Drain Hose Debris or buildup in the drain hose can trap water and create a sewage smell. | Common | Easy | Drain hose |
| Contaminated Pump Filter A dirty or clogged pump filter can cause water to back up and produce foul odors. | Common | Easy | Pump filter |
| Standing Water in Drum or Tub Leftover water can stagnate and develop a sewage-like smell, especially in warm environments. | Common | Easy | None |
| Faulty Drain Pump A broken or clogged drain pump can prevent proper drainage, leading to sewage odors. | Sometimes | Medium | Drain pump |
| Damaged Drain Hose Cracks or leaks in the drain hose can allow sewage smells to escape. | Sometimes | Easy | Drain hose |
| Mold or Mildew Buildup Moisture trapped in the washer can lead to mold or mildew, which can smell like sewage. | Sometimes | Easy–Medium | None |
Parts matching
If you need to replace parts, here are common items for this issue:
- Drain Hose
- Pump Filter
- Drain Pump
- Water Inlet Valve
- Washer Tub Cleaner
Always refer to your washer's manual for specific part numbers and compatibility.
When to call a professional
- The sewage smell persists after cleaning and replacing all accessible parts
- You notice water leaking from the washer or floor
- The drain pump makes loud, unusual noises that suggest internal damage
- You're unsure about safely replacing parts like the drain pump or water pump
- The washer is under warranty and you don't want to risk voiding it by DIY repairs
FAQ
Can I use bleach to clean my washer if it smells like sewage?
Yes, but only if the manufacturer allows it. Use a diluted bleach solution and run a hot water cycle. However, vinegar and baking soda are safer for most washers.
Why does my washer smell like sewage even after cleaning the drain?
Standing water in the drum or tub, a faulty pump, or mold buildup could still be the cause. Check all components thoroughly.
How often should I clean my washer to prevent sewage smells?
Clean the pump filter and run a cleaning cycle with vinegar or a washer cleaner every 1–2 months to prevent buildup.
Is it normal for a washer to smell slightly after a cycle?
A mild damp smell is normal, but a strong sewage odor is not. It indicates a clog, mold, or mechanical issue.