The short answer
What Causes the Smell
The most common reason is a clogged or slow-moving drain line. When water sits in the hose or the P-trap, it becomes a breeding ground for bacteria and mold. Those microbes produce hydrogen sulfide gas, which smells like rotten eggs or sewage.
Another cause is a drain hose that is kinked or installed too low. That lets dirty water flow back into the washer. Over time, soap residue and lint build up inside the hose, trapping moisture and odor. If the drain line is shared with the sink or standpipe, waste from there can also back up into the washer.
How to Check the Drain Hose
Start by unplugging the washer and pulling it away from the wall. Look at the drain hose where it connects to the standpipe or sink drain. If the hose is pushed too far into the pipe, it can siphon water back, which causes the smell. Pull it back so there is a small air gap.
Check the hose for kinks or bends. A kinked hose traps water and debris. Straighten it or replace it if it is cracked. Also, inspect the P-trap under the sink if the washer drains into it. A dry P-trap can let sewer gas escape, so run water down the sink regularly to keep it sealed.
- Unplug the washer before checking the hose
- Look for kinks, cracks, or loose connections
- Make sure the hose is not too deep into the standpipe
- Run water down the sink to keep the P-trap filled
- Clean the hose with a long brush if you can reach it
Cleaning the Washer Drain
Run an empty cycle with hot water and a cup of white vinegar or a washing machine cleaner. This helps break down soap scum and lift bacteria from the drum and drain. Let the cycle finish, then run another rinse cycle to flush everything out.
For a deeper clean, remove the drain hose and flush it with a garden hose or a long, flexible brush. If the hose is clogged with thick lint, you may need to replace it. Clean the washer filter if your model has one, since trapped debris there can also cause odors.
When to Call a Plumber
If cleaning the hose and running a vinegar cycle does not fix the smell, the problem may be in the wall or the main drain line. A plumber can snake the drain to clear blockages that you cannot reach. They can also check if the vent pipe is clogged, which can cause sewer gas to back up.
If you live in Mesa, keep the shutoff valve location written down in case you need to stop water flow during a repair. A plumber can also confirm that the drain line meets local code. That helps prevent future backups and odors.
Preventing Future Odors
Leave the washer door open after every load so the drum dries out. Wipe the rubber gasket and the door seal to remove trapped water and lint. Run a hot water cycle with vinegar or a cleaner once a month to keep bacteria from building up.
Also, use the right amount of detergent. Too much soap leaves residue that feeds bacteria. If the washer drains into a standpipe, make sure the hose is held up high enough to prevent siphoning. A simple hook or clamp can keep it in place.
- Leave the door open between loads
- Wipe the gasket and seal regularly
- Use the correct detergent amount
- Run a monthly cleaning cycle
- Keep the drain hose properly positioned
Talk to someone now
Phones are answered 24/7 for Mesa and nearby communities.
Call Now (480) 898-4279Frequently asked questions
Is it safe to keep using the washer if it smells?
Using the washer is not dangerous, but the smell means bacteria are growing. That bacteria can spread to your clothes. Clean the drain and run a hot cycle first. If the odor persists, call a plumber to inspect the drain line before doing more laundry.
Can I use bleach to clean the washer drain?
Bleach can kill bacteria, but it may damage rubber parts or the washer finish if used too often. Vinegar or a washer cleaner is safer for regular use. If you use bleach, run an extra rinse cycle to flush it out completely.
What if the smell comes from the floor drain instead?
A floor drain can also trap water and grow bacteria. Pour a bucket of water down the drain to refill the trap. If the smell continues, the drain may be clogged. A plumber can clean it to stop the odor.