A dishwasher often pumps into the same drain path as the kitchen sink. If that path is restricted downstream of the connection, the dishwasher can send water back up into the sink. The timing helps narrow down which part of the system to inspect.
Note where the water appears
If water rises in the sink as the dishwasher empties, note whether the sink also drains slowly on its own. If water instead spills from a countertop air gap, tell the plumber where you saw it. That detail can point toward the section between the air gap and the sink drain connection. If water stays inside the dishwasher and the sink drains normally, the appliance or its discharge path may need attention.
Share what changed recently
Mention a new disposal, recent cabinet work, or any prior clog. Tell the technician whether other fixtures are affected. If water is rising or spilling, stop the dishwasher cycle and avoid adding more water. Our kitchen drain cleaning service can help trace a restriction in the shared drain path.