SEWAGE TREATMENT PLANTS REQUIRED refers to the need for vessels to have reliable sewage treatment systems installed to comply with maritime environmental regulations. These systems are required to process and treat sewage onboard, ensuring that harmful pollutants are not released into the ocean. The installation of sewage treatment plants is an essential part of a vessel’s environmental management system, helping to prevent pollution and meet international standards. Vessels without proper sewage treatment systems can face penalties and contribute to marine pollution.