WA SB5519

Ocean-going vessels operating within 3 nautical miles of Washington's shoreline must use marine gas oil or marine diesel oil with no more than 0.1% sulfur content by weight, effective January 1, 2028

Applies to commercial, government, or military vessels that are 400+ feet in length, 10,000+ gross tons, or have marine compression ignition engines with 30+ liter per-cylinder displacement; excludes tugboats, towboats, and pushboats

Vessels may pay noncompliance fees instead of meeting fuel requirements if they demonstrate compliance is beyond their control due to unplanned redirection, inadequate fuel supply, or if the vessel visits Washington ports no more than twice per year

Noncompliance fees are paid to the port conducting the visit and must be used for port electrification or emission reduction activities; if a port declines, fees go to the air quality and health disparities improvement account

Violations carry civil penalties of $10,000 per day per violation, appealable to the pollution control hearings board, with penalties deposited in the natural climate solutions account