![Need some help, not sure what's up with this. When the dishwasher runs the sink above the disposal fills up with waste water. Just moved in and no idea what to do Need some help, not sure what's up with this. When the dishwasher runs the sink above the disposal fills up with waste water. Just moved in and no idea what to do](https://i.redd.it/uzu3t473mwd11.jpg)
Need some help, not sure what's up with this. When the dishwasher runs the sink above the disposal fills up with waste water. Just moved in and no idea what to do
![drainage - What is causing my kitchen drain to back up into my dishwasher? - Home Improvement Stack Exchange drainage - What is causing my kitchen drain to back up into my dishwasher? - Home Improvement Stack Exchange](https://i.stack.imgur.com/t9V12.png)
drainage - What is causing my kitchen drain to back up into my dishwasher? - Home Improvement Stack Exchange
![plumbing - Backed up kitchen sink drain that gets worse when I run garbage disposal - Home Improvement Stack Exchange plumbing - Backed up kitchen sink drain that gets worse when I run garbage disposal - Home Improvement Stack Exchange](https://i.stack.imgur.com/bCnnY.jpg)