Reducing environmental impacts associated with the operation of certain ocean-going vessels.

SB 5519 requires ocean-going vessels to use low-sulfur fuels (with a maximum sulfur content of 0.1% by weight) in auxiliary engines, main engines, and auxiliary boilers when operating within three nautical miles of Washington's shoreline, starting January 1, 2028. This applies to commercial, government, and military vessels meeting specific size or engine criteria (e.g., over 400 feet long or with certain propulsion systems), but excludes tugboats and similar small vessels. The bill mandates that vessel operators maintain detailed records of fuel types, fuel-switching procedures, and vessel positions to verify compliance. These measures aim to reduce harmful air pollution from vessel operations, protecting public health and coastal environments in Washington.