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Yes, a dishwasher needs an air gap to prevent backflow. Additionally, in many locations, air gaps or another measure to prevent backflow are required for building code compliance. There are alternatives to an air gap, like a Studor vent or a loop and trap design, but an air gap is the simplest and most popular solution.  

Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.

Costs depend on labor rates, replacement part prices, brand, and whether emergency service is required.

The cost to repair a dishwasher is $200 on average, with the typical price ranging from $160 to $300. However, if you need a more specialized repair, that total could reach $600. The main cost factor is the price of the replacement part, but the dishwasher’s make, model, and year can also impact the price. 

For a simple repair, such as a filter replacement, you can comfortably budget to spend between $50 to $100. But for something more complex like a repair on the dishwasher’s motor, you might see a bill totaling $400 to $600.