Can You Plumb a Dishwasher and Washing Machine Together?

Yes, sometimes. However, each appliance requires proper water supply, drainage, and backflow protection to meet local codes.

You cannot casually tie these appliances together. Dishwashers usually drain under a kitchen sink, while washing machines require a high-volume standpipe.

Combining drains incorrectly causes severe backups, odors, or siphoning. Any shared drain must be sized and vented correctly. Always consult a professional to ensure the setup includes proper traps and meets local plumbing codes.

This requires careful code review and is never a simple DIY job.

Yes, if the branch line is correctly sized and has proper shutoff valves.