Marine sanitation device

A Marine Sanitation Device, commonly known as an “MSD” is a piece of machinery or a mechanical system that is dedicated to treat, process, and/or store raw, untreated sewage that can accumulate onboard water vessels. It does not refer to portable devices such as portable toilets. A Marine Sanitation Device, commonly known as an “MSD” is a piece of machinery or a mechanical system that is dedicated to treat, process, and/or store raw, untreated sewage that can accumulate onboard water vessels. It does not refer to portable devices such as portable toilets. In the United States, the Environmental Protection Agency (EPA) sets performance standards for Marine Sanitation Devices, and the U.S. Coast Guard (USCG) issues regulations governing the design, construction, certification, installation and operation of MSDs.