As of 2015, Miele makes the dishwasher with the lowest decibel rating. The Miele Futura Diamond Series, specifically the model number G5915SCi, is the quietest, with a decibel rating of 37.
The Miele G5915SCi features a number of programs for washing dishes, one of which, labeled as the ExtraQuiet program, features the lowest decibel rating. Under more normal wash cycles, the dishwasher has a decibel rating of 42, which is still considered to be a relatively quiet noise level for a dishwasher. The dishwasher also features a full console child lock and is Energy Star rated. However, it is one of the more expensive dishwashers on the market and requires a custom panel to install.