Sink Gurgles When Washing Machine Drains

When the washing machine drains, does your sink gurgle? It can be a puzzling and annoying problem. Here are a few possible causes and how to fix them:

1. Clogged Drain Pipe: The drain pipe that connects the sink and washing machine may be clogged with debris, such as hair, soap scum, or food particles. This can create a blockage that prevents water from draining properly, causing gurgling sounds.

Fix: To unclog the drain pipe, you can use a drain snake or a chemical drain cleaner. Be sure to follow the manufacturer's instructions carefully when using a chemical drain cleaner.

2. Blocked Vent Stack: The vent stack is a pipe that allows air to enter the drainage system to prevent siphoning. If the vent stack is blocked, it can cause gurgling sounds when the washing machine drains.

Fix: Inspect the vent stack for any obstructions, such as nests or debris. If you find any obstructions, remove them to restore proper airflow.

3. Defective P-Trap: The P-trap is a U-shaped pipe under the sink that holds water to create a seal against sewer gases. If the P-trap is damaged or loose, it can allow sewer gases to escape and cause gurgling sounds.

Fix: Tighten any loose connections or replace the P-trap if it is damaged.

4. Oversized Drain Hose: The drain hose that connects the washing machine to the drain pipe may be too large. This can cause the water to drain too quickly, creating a vacuum effect that draws air into the system and causes gurgling.

Fix: Replace the drain hose with one that is the correct size for your washing machine.

5. Improperly Installed Washing Machine: If the washing machine is not properly installed, it can cause gurgling sounds when it drains. For example, the drain hose may not be properly connected to the drain pipe or the washing machine may be sitting too low, causing water to back up into the sink.

Fix: Reinstall the washing machine according to the manufacturer's instructions, ensuring that the drain hose is properly connected and the machine is level.

6. Slow Drain in Sink: If your sink has a slow drain, it can cause gurgling sounds when the washing machine drains. This is because the water from the washing machine can back up into the sink if it cannot drain away quickly enough.

Fix: Clean the sink drain to remove any clogs and ensure it is draining properly.

7. Clogged Sewer Line: In rare cases, the gurgling sound may be caused by a clogged sewer line. This is a more serious problem that requires professional attention.

Fix: Contact a plumber to have the sewer line inspected and cleaned.