Dishwasher Critic has an article reviewing five of the quietest dishwashers on the market. For more in-depth dishwasher reviews and a larger selection, Reviewed.com lists the decibel level in the Specifications tab of each dishwasher. Sears categorizes dishwashers with decibel levels of 46 to 50 as being quiet.
There are, however, dishwashers with lower decibel levels, such as the Samsung DW80H9970US, which has an operating decibel level of 40 and a Reviewed.com score of 9.4. Reviewed.com tests each dishwasher's performance by running real-world tests such as lasagna and baked-on egg removal. Reviewed.com also reviews how uniform the sprayers clean by looking at how clean the plates are in different areas of the dishwasher. They also run tests that determine energy and water usage.