The International Maritime Pollution Accountability Act of 2025 creates a fee system on maritime shipping operators to reduce ocean-based pollution and fund clean transportation initiatives. Beginning January 1, 2027, operators of large cargo vessels (5,000+ gross tons) entering U.S. waters must report quarterly voyage details and pay fees based on carbon emissions ($150 per metric ton of CO2-equivalent, with rates tripled for polar region travel) plus separate fees for nitrogen oxides, sulfur dioxide, and fine particulate matter. The bill dedicates the collected revenues—projected at $4.25 billion annually—to upgrade domestic ships to low-carbon fuels, fund research on sustainable maritime fuels, train workers for clean port equipment, and support harbor and ferry vessel electrification, with 5% directed to air monitoring in port communities. The legislation includes inflation adjustments and penalties for late payment, and it would sunset if the International Maritime Organization adopts a comparable global carbon fee. The bill addresses the fact that marine shipping accounts for nearly 3% of global carbon emissions and that ports significantly contribute to air pollution.
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