Dishwasher causing backup in sink: diagnosis and repair
Kitchen4 min readDecember 2024
Dishwasher and sink connection issues
When your dishwasher causes water to back up into your kitchen sink, it indicates a problem with the shared drainage system that requires professional attention.
Why this happens
- Shared drain line: Dishwashers and sinks often share the same drain
- Garbage disposal issues: Clogs in the disposal can affect both appliances
- Improper installation: Incorrect dishwasher drain hose positioning
- Blockage downstream: Clogs further down the line affect both fixtures
Professional diagnosis
HydroGo's technicians can determine whether the issue is with the dishwasher connection, garbage disposal, or main drain line using camera inspection technology.
Effective solutions
Solutions may include drain cleaning, garbage disposal repair, or dishwasher drain hose adjustment. We provide clear explanations and transparent pricing for all recommended work.

