The shipping industry along the Pacific Coast can lead to water pollution due to fuel spills, ballast water discharge, and other contaminants from ships.

The Pacific Coast's shipping industry, which includes major ports like Los Angeles, Long Beach, and Seattle, faces environmental concerns, with water pollution being a primary issue. Ships often release oil, chemicals, and ballast water (which can introduce invasive species) into the ocean. These pollutants can harm marine life, disrupt ecosystems, and degrade water quality. Furthermore, the health of the coastal and marine habitats along the Pacific Coast is directly impacted by ship-related water pollution, even if air pollution and overfishing are also issues.