Australian Waters - Exhaust Gas Cleaning Systems Requirements The Australian Maritime Safety Authority (AMSA) has updated its guidance on requirements for Exhaust Gas Cleaning Systems (EGCS) in Australian waters. Information Notices Loss Prevention Published: September 16, 2025 Contact author Download article pdf The guidance issued under Marine Notice 2025/04 supersedes Marine Notice 2022/12, and should be read in conjunction with MARPOL Annex VI and its associated guidelines, relevant Acts and Marine Orders. 1.    Application  The guidance is intended to provide awareness for maritime stakeholders on the requirements of vessels with installed EGCS when in Australian waters. 2.    Requirements AMSA reiterates that for compliance in Australian waters, the EGCS should be: approved by the vessel’s Flag State Administration, or a Recognised Organisation appointed by the Flag State. operated in accordance with International Maritime Organization (IMO) requirements, including the MEPC.340(77) - 2021 GUIDELINES FOR EXHAUST GAS CLEANING SYSTEMS . In addition, the key elements of the guidelines are summarised for the understanding of our Members. While all EGCS types (Open-loop, Closed-loop and Hybrid) can be operated and release discharge water in Australian waters, all discharges must meet the discharge water quality criteria indicated in the relevant IMO guidelines. EGCS sludge and residues should be disposed of at reception facilities and must not be discharged at sea or incinerated on board. Operational requirements are crew familiarity, equipment functionality, timely maintenance, and recordkeeping. EGCS malfunctions are to be attended and addressed immediately. If the malfunction occurred once and was resolved within 1 hour, there is no requirement to report it. If the malfunction lasts for more than one hour or occurs repeatedly, the vessel should switch to a compliant fuel and report the incident to the vessel’s Flag Sta