2010 HNS Convention Clears Ratification Threshold, Entry Into Force Nears

The International Maritime Organization announced that Belgium, Germany, the Netherlands, and Sweden have deposited instruments of ratification to the 2010 HNS Convention, achieving a critical milestone in the decades-long effort to establish a comprehensive liability and compensation regime for hazardous and noxious substances transported by sea. With 12 Contracting States now committed to the convention, the treaty meets the minimum number of states required for entry into force. The ratification threshold includes a second requirement: at least four states with gross tonnage of 2 million units or greater. Five of the eight previously ratifying states already exceed that threshold, and the four new signatories bring additional shipping capacity to the accord. **The Path to Implementation** Despite clearing the political hurdle, the 2010 HNS Protocol will not enter into force for 18 months after Contracting Parties collectively receive 40 million tonnes of cargo contributing to the HNS general account during a single calendar year. In 2025, the four newly ratifying nations handled nearly 28 million tonnes of such cargo—a substantial portion of the target, but leaving approximately 12 million tonnes still needed to trigger the countdown. This staggered approach ensures that any entry into force is backed by adequate insurance and compensation funding to handle actual incidents. Contracting States must submit annual reports on qualifying cargo tonnage to the IMO Secretary-General by May 31 each year until the protocol activates. **Why This Matters for Shipping** The 2010 HNS Convention addresses a significant gap in maritime law. While international frameworks exist for compensation from oil spills (via MARPOL and related conventions), hazardous cargo incidents have lacked comparable global liability rules. The convention establishes liability limits for ship owners and a tiered compensation system, ensuring that affected parties—coastal communities, fishing interests, and cargo interests—have recourse when incidents occur. The timing reflects the maritime industry's evolving risk profile. Chemical shipments have grown substantially, and the energy transition has accelerated the transport of alternative fuels—including ammonia, methanol, and hydrogen derivatives—in bulk quantities. These cargoes present novel contamination and explosion risks that existing regimes did not anticipate. The IMO has identified hazardous cargo transport as an area of increasing concern, making liability protection a regulatory priority. **European Leadership** Belgium, Germany, the Netherlands, and Sweden are among Europe's largest container and general cargo hubs, handling tens of millions of tonnes of hazardous materials annually through ports in Rotterdam, Hamburg, Antwerp, and other gateways. Their collective ratification demonstrates strong regional commitment to the framework and reflects the port states' interest in predictable liability rules for incident response and recovery. These four nations must now report their 2025 cargo volumes annually. Combined with existing ratifications from Australia, Canada, Denmark, Finland, France, Japan, Norway, and Spain, the current pool already represents substantial global shipping capacity. Industry observers anticipate that additional maritime powers—such as the United States, China, or other major container and tanker operators—may ratify in coming years, accelerating the timeline to the 40-million-tonne threshold. **Next Steps** Once entry into force occurs, participating states will enforce the convention domestically, establishing national liability caps for HNS incidents and ensuring that ship owners maintain adequate insurance or financial guarantees. The convention will reshape incident response protocols in signatory states, requiring new claims procedures and compensation frameworks. For shipowners, insurers, and logistics operators, the convention's eventual implementation will increase the cost of hazardous cargo carriage but provide clarity on liability exposure—a trade-off that the industry has long accepted as necessary for sustainable maritime commerce.