A dishwasher’s noise level is measured in decibels (dB), and most dishwashers fall within the range of 46-60 dB. A dishwasher that operates below 45 dB is considered very quiet. Dishwashers in the range of 39-45 dB produce a noise level similar to the sound of rainfall or ambient noise in a library. They are reticent and create a peaceful environment comparable to the early mornings in quiet suburban neighborhoods.