Final answer:
Motorized vessels in Washington State must have equipment to reduce or muffle noise pollution, with muffling devices on engines as a common requirement. MHD propulsion systems are an example of technology used to make submarines quieter.
Step-by-step explanation:
In Washington State, motorized vessels are required to have a mechanical means of reducing or muffling noise pollution. This usually refers to a sound-muffling apparatus for the engine to help minimize its acoustic output. While specific information about Washington State requirements wasn't provided, general practices to protect marine environments include ensuring marine vessels minimize the disruption caused by their machinery.
For example, novel technologies like magnetohydrodynamic (MHD) propulsion systems in nuclear submarines are being explored because they create significantly less turbulence compared to traditional propellers and operate more silently, as depicted in the film "The Hunt for Red October". Additionally, while the provided information about the preservation of Maryland waters and federal regulations on ballast water (BW) management don't directly answer the question, they serve as examples of the broader context of environmental regulations affecting watercraft.