While a clogged drain line is the most likely reason why your kitchen or bathroom sink is backing up water into the tub, there are other possible causes you might want to consider. After all, carrying out the wrong solution not only wastes your time, but it can also compromise your drainage system further. If both sides of your kitchen sink are filling up with water, clog up the sink drain on the side without the disposal. You can do this by firmly pushing down the drain plug to ensure a tight seal. After that, you can then turn on

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sink backed up
sink backed up with water
sink backed up into dishwasher
sink backed up with black water
sink backed up on both sides
sink backed up from dishwasher
sink backed up into tub
sink backed up garbage disposal
sink backed up after running dishwasher
sink backed up from grease