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No, you don’t need a garbage disposal for a dishwasher. A dishwasher will work without a garbage disposal. However, the two appliances pair well and are often installed together. It is rare to see a home with a dishwasher that doesn’t have a garbage disposal, but that doesn’t mean it's not possible. Each appliance serves its own purpose. 

Garbage disposals can last between 10 and 12 years, so if your unit is pushing its lifespan, it may be a good idea to replace it. If your unit isn’t approaching the 10-year mark, try investigating other parts of the disposal to see if there's an affordable repair on the horizon. For example, rubber has a shorter lifespan than 10 years, connections and hoses loosen over time, and sink flanges can cause leaks that have nothing to do with disposals.

While the part of the garbage disposal that attaches to the sink is universal, not every single disposal will work in every sink cabinet. A larger disposal may be too big to fit in a compact space, for example. If the pipes under your sink are arranged in an unusual way, it may be difficult to put in a bigger disposal, even if there technically is enough space.

Garbage disposals last an average of seven years but can function well past 10 years. However, as time goes on and more food is ground, the grinding plates will slowly lose their edge and need replacing. A motor likely won’t last 10 or more years, but you should be able to get a minimum of five years at least, even under heavy usage.