Embodiments disclosed herein are directed towards noise reduction pipes, vacuum-assisted toilet systems including the same, and methods of using the same. An example noise reduction pipe includes a first end and a second end that is opposite the first end. The first end is configured to be coupled to an outlet of a toilet bowl and the second end is configured to be coupled to an inlet of a flush valve. The noise reduction pipe defines a fluid flow path that extends between the first end and the second end such that waste may flow from the first end to the second end. The noise reduction pipe also includes one or more bends. Each of the bends exhibits a radius of curvature that is greater than about 5 cm or a length that is greater than about 30 cm.