The Ballast Water Management (BWM) Convention is the IMO treaty governing the control of harmful aquatic organisms in ships' ballast water. Adopted in 2004, in force from 8 September 2017. Since 8 September 2024, all applicable vessels must meet the D-2 ballast water treatment standard, requiring an approved Ballast Water Treatment System (BWTS) onboard. https://www.shipfinex.com/blog/ballast-water-management-convention